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/******************************************************************************
* Copyright (c) 2013 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 _IPV6_H_
#define _IPV6_H_
#include <stdint.h>
#include <netlib/ethernet.h>
#define __IPV6_DEBUG__
#ifdef __IPV6_DEBUG__
#define IPV6_DEBUG_PRINT(format, ...) do { printf(format, ## __VA_ARGS__); } while (0)
#else
#define IPV6_DEBUG_PRINT(format, ...)
#endif
#define IPV6_ADDR_LENGTH 16 /* Size of IPv6 adress in bytes */
#define IPV6_LL_PREFIX 0xFE80000000000000ULL
#define IPV6_SOLIC_NODE_PREFIX 0xFF02000000000000ULL
#define IPV6_SOLIC_NODE_IFACE_ID 0x00000001FF000000ULL
/**
* An IPv6 Address
*/
typedef union {
uint8_t addr[IPV6_ADDR_LENGTH];
struct {
uint64_t prefix;
uint64_t interface_id;
} part;
} ip6_addr_t;
typedef struct {
uint8_t type;
uint8_t pad[7];
union {
ip6_addr_t v6;
char v4[4];
} addr;
} netaddr_t;
/** \struct prefix_info
*
* List of Prefixes we have adresses from
* Used for internal purposes, information derived from prefix option
* in Router Advertisements
* See RFC 4861 section 4.6.2
*/
struct prefix_info {
uint64_t prefix;
uint8_t on_link:1, /* When set prefix can be used for on-link
* determination */
autoconf:1, /* Prefix can be used for stateless address
* configuration */
reserved1:6;
uint32_t valid_lifetime; /* Time until prefix expires */
uint32_t preferred_lifetime; /* Time until prefix becomes deprecated */
uint32_t start_time; /* Time when received */
uint32_t reserved2;
struct prefix_info *next;
};
/* List of IPv6 addresses */
struct ip6addr_list_entry {
ip6_addr_t addr;
struct prefix_info prfx_info;
struct ip6addr_list_entry *next;
};
/** \struct ip6hdr
* A header for IPv6 packets.
* For more information see RFC 2460
*/
struct ip6hdr {
uint32_t ver_tc_fl; /**< Version, Traffic class, Flow label */
uint16_t pl; /**< Payload length */
uint8_t nh; /**< Next header */
uint8_t hl; /**< Hop limit */
ip6_addr_t src; /**< IPv6 source address */
ip6_addr_t dst; /**< IPv6 destination address */
} __attribute((packed));
/** \struct packeth
* Struct with pointers to headers within a packet
*/
struct packeth {
struct ethhdr *ethh;
struct ip6hdr *ip6h;
struct icmp6hdr *icmp6h;
struct udphdr *udph;
/* ... */
};
/** \struct parseip6_state
* Stores information about state of IPv6 address parser
*/
struct parseip6_state {
char *lookahead;
char *ptr;
const char *addr;
int state;
int s1ctr;
int s2ctr;
int blocknr;
int zeroblocks;
int i;
int done;
int errorcode;
};
/** \struct ip6_config
* Stores flags wheter we use Stateless- or Stateful Autoconfiguration or DHCPv6
*/
struct ip6_config {
uint8_t managed_mode:1,
other_config:1,
reserved:6;
} ip6_state;
/******************** VARIABLES **********************************************/
/* Function pointer send_ip. Points either to send_ipv4() or send_ipv6() */
extern int (*send_ip) (int fd, void *, int);
/* IPv6 link-local multicast addresses */
struct ip6addr_list_entry all_routers_ll; // Routers
struct ip6addr_list_entry all_dhcpv6_ll; // DHCPv6 servers
struct ip6addr_list_entry all_nodes_ll; // All IPv6 nodes
/* List of Ipv6 Addresses */
struct ip6addr_list_entry *first_ip6;
struct ip6addr_list_entry *last_ip6;
/* Neighbor cache */
struct neighbor *first_neighbor;
struct neighbor *last_neighbor;
/* Router list */
struct router *first_router;
struct router *last_router;
/******************** FUNCTIONS *********************************************/
/* Handles IPv6-packets that are detected by receive_ether. */
int8_t handle_ipv6(int fd, uint8_t * ip6_packet, int32_t packetsize);
/* Fill IPv6 header */
void fill_ip6hdr(uint8_t * packet, uint16_t packetsize,
uint8_t ip_proto, ip6_addr_t *ip6_src, ip6_addr_t *ip6_dst);
/* Set own IPv6 address */
void set_ipv6_address(int fd, ip6_addr_t *own_ip6);
/* Get own IPv6 address */
ip6_addr_t *get_ipv6_address(void);
/* Create link-local address from a given Mac Address */
ip6_addr_t * ip6_create_ll_address (const uint8_t *own_mac);
/* For a given MAC calculates EUI64-Identifier.*/
uint64_t mac2eui64 (const uint8_t *mac);
/* Create empty element for prefix list and return a pointer to it */
struct prefix_info * ip6_create_prefix_info(void);
/* Create a new IPv6 address with a given network prefix
* and add it to our IPv6 address list */
void * ip6_prefix2addr (ip6_addr_t prefix);
/* Compare IPv6 adresses */
int8_t ip6_cmp( ip6_addr_t *ip_1, ip6_addr_t *ip_2 );
/* Check if prefix is already in our list */
int8_t unknown_prefix (ip6_addr_t *ip);
/* Send IPv6 packet */
int send_ipv6 (int fd, void* buffer, int len);
/* Add IPv6 address to list */
int8_t ip6addr_add (struct ip6addr_list_entry *new_address);
/* Parse an IPv6 address */
int parseip6(const char *addr, uint8_t *parsedaddr);
int str_to_ipv6(const char *str, uint8_t *ip);
void ipv6_to_str(const uint8_t *ip, char *str);
#endif
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