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/******************************************************************************
* Copyright (c) 2004, 2008 IBM Corporation
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
#ifndef _IPV4_H_
#define _IPV4_H_
#include <stdint.h>
#define IPTYPE_ICMP 1
/** \struct iphdr
* A header for IP-packets.
* For more information see RFC 791.
*/
struct iphdr {
uint8_t ip_hlv; /**< Header length and version of the header */
uint8_t ip_tos; /**< Type of Service */
uint16_t ip_len; /**< Length in octets, inlc. this header and data */
uint16_t ip_id; /**< ID is used to aid in assembling framents */
uint16_t ip_off; /**< Info about fragmentation (control, offset) */
uint8_t ip_ttl; /**< Time to Live */
uint8_t ip_p; /**< Next level protocol type */
uint16_t ip_sum; /**< Header checksum */
uint32_t ip_src; /**< Source IP address */
uint32_t ip_dst; /**< Destination IP address */
};
typedef struct iphdr ipv4_hdr_t;
/* ICMP Error Codes */
#define ICMP_NET_UNREACHABLE 0
#define ICMP_HOST_UNREACHABLE 1
#define ICMP_PROTOCOL_UNREACHABLE 2
#define ICMP_PORT_UNREACHABLE 3
#define ICMP_FRAGMENTATION_NEEDED 4
#define ICMP_SOURCE_ROUTE_FAILED 5
/** \struct arphdr
* A header for ARP-messages, retains info about HW and proto addresses.
* For more information see RFC 826.
*/
struct arphdr {
uint16_t hw_type; /**< HW address space (1 for Ethernet) */
uint16_t proto_type; /**< Protocol address space */
uint8_t hw_len; /**< Byte length of each HW address */
uint8_t proto_len; /**< Byte length of each proto address */
uint16_t opcode; /**< Identifies is it request (1) or reply (2) */
uint8_t src_mac[6]; /**< HW address of sender of this packet */
uint32_t src_ip; /**< Proto address of sender of this packet */
uint8_t dest_mac[6]; /**< HW address of target of this packet */
uint32_t dest_ip; /**< Proto address of target of this packet */
} __attribute((packed));
/************** Initialization of the IPv4 network layer. **************/
extern void set_ipv4_address(uint32_t own_ip);
extern uint32_t get_ipv4_address(void);
extern void set_ipv4_multicast(uint32_t multicast_ip);
extern uint32_t get_ipv4_multicast(void);
extern void set_ipv4_router(uint32_t router_ip);
extern uint32_t get_ipv4_router(void);
extern void set_ipv4_netmask(uint32_t subnet_mask);
extern uint32_t get_ipv4_netmask(void);
extern uint32_t get_default_ipv4_netmask(char *ip_addr);
/* fills ip header */
extern void fill_iphdr(uint8_t * packet, uint16_t packetsize,
uint8_t ip_proto, uint32_t ip_src, uint32_t ip_dst);
/* Send a IPv4 packet. Adding the Ethernet-Header and resolving the
* MAC address is done transparent in the background if necessary.
*/
extern int send_ipv4(int fd, void* buffer, int len);
/* Sends an ICMP Echo request to destination IPv4 address */
extern void ping_ipv4(int fd, uint32_t _ping_dst_ip);
/* Returns host IPv4 address that we are waiting for a response */
extern uint32_t pong_ipv4(void);
/* Handles IPv4-packets that are detected by receive_ether. */
extern int8_t handle_ipv4(int fd, uint8_t * packet, uint32_t packetsize);
/* Handles ARP-packets that are detected by receive_ether. */
extern int8_t handle_arp(int fd, uint8_t * packet, uint32_t packetsize);
#endif
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