1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/******************************************************************************
* 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_LL_PREFIX_MASK 0xFFC0000000000000ULL
#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;
};
/******************** VARIABLES **********************************************/
/* Function pointer send_ip. Points either to send_ipv4() or send_ipv6() */
extern int (*send_ip) (int fd, void *, int);
extern struct ip6_config ip6_state;
/******************** FUNCTIONS *********************************************/
/* Handles IPv6-packets that are detected by receive_ether. */
int8_t handle_ipv6(int fd, uint8_t * ip6_packet, uint32_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 it is a link-local address */
static inline int ip6_is_linklocal(ip6_addr_t *ip)
{
return (ip->part.prefix & IPV6_LL_PREFIX_MASK) == IPV6_LL_PREFIX;
}
/* 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
|
