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//
// ip.h
//
// Internet Protocol (IP)
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
// Portions Copyright (C) 2001, Swedish Institute of Computer Science.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright 
//    notice, this list of conditions and the following disclaimer.  
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.  
// 3. Neither the name of the project nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
// SUCH DAMAGE.
// 

#ifndef IP_H
#define IP_H

void ip_init();
int ip_ownaddr(struct ip_addr *addr);
struct netif *ip_route(struct ip_addr *dest);
err_t ip_input(struct pbuf *p, struct netif *inp);
err_t ip_input_dur(int code, struct pbuf *p);
err_t ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, int ttl, int proto);
err_t ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest, int ttl, int proto, struct netif *netif);

#define IP_HLEN 20

#define IP_PROTO_ICMP    1
#define IP_PROTO_UDP     17
#define IP_PROTO_TCP     6

// This is passed as the destination address to ip_output_if (not
// to ip_output), meaning that an IP header already is constructed
// in the pbuf.

#define IP_HDRINCL  NULL

#define IP_RF      0x8000        // Reserved fragment flag
#define IP_DF      0x4000        // Dont fragment flag
#define IP_MF      0x2000        // More fragments flag
#define IP_OFFMASK 0x1fff        // Mask for fragmenting bits

#pragma pack(push, 1)

struct ip_hdr {
  unsigned short _v_hl_tos;      // Version / header length / type of service
  unsigned short _len;           // Total length
  unsigned short _id;            // Identification
  unsigned short _offset;        // Fragment offset field
  unsigned short _ttl_proto;     // Time to live / protocol
  unsigned short _chksum;        // Checksum
  struct ip_addr src, dest;      // Source and destination IP addresses
};

#pragma pack(pop)

#define IPH_V(hdr)  (NTOHS((hdr)->_v_hl_tos) >> 12)
#define IPH_HL(hdr) ((NTOHS((hdr)->_v_hl_tos) >> 8) & 0x0F)
#define IPH_TOS(hdr) HTONS((NTOHS((hdr)->_v_hl_tos) & 0xFF))
#define IPH_LEN(hdr) ((hdr)->_len)
#define IPH_ID(hdr) ((hdr)->_id)
#define IPH_OFFSET(hdr) ((hdr)->_offset)
#define IPH_TTL(hdr) (NTOHS((hdr)->_ttl_proto) >> 8)
#define IPH_PROTO(hdr) (NTOHS((hdr)->_ttl_proto) & 0xFF)
#define IPH_CHKSUM(hdr) ((hdr)->_chksum)

#define IPH_VHLTOS_SET(hdr, v, hl, tos) (hdr)->_v_hl_tos = HTONS(((v) << 12) | ((hl) << 8) | (tos))
#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl_proto = HTONS(IPH_PROTO(hdr) | ((ttl) << 8))
#define IPH_PROTO_SET(hdr, proto) (hdr)->_ttl_proto = HTONS((proto) | (IPH_TTL(hdr) << 8))
#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)

#endif