1 /******************************************************************************
2 * Copyright (c) 2013 IBM Corporation
3 * All rights reserved.
4 * This program and the accompanying materials
5 * are made available under the terms of the BSD License
6 * which accompanies this distribution, and is available at
7 * http://www.opensource.org/licenses/bsd-license.php
8 *
9 * Contributors:
10 * IBM Corporation - initial implementation
11 *****************************************************************************/
12
13 #ifndef _IPV6_H_
14 #define _IPV6_H_
15
16 #include <stdint.h>
17 #include "ethernet.h"
18
19 #define __IPV6_DEBUG__
20
21 #ifdef __IPV6_DEBUG__
22 #define IPV6_DEBUG_PRINT(format, ...) do { printf(format, ## __VA_ARGS__); } while (0)
23 #else
24 #define IPV6_DEBUG_PRINT(format, ...)
25 #endif
26
27 #define IPV6_ADDR_LENGTH 16 /* Size of IPv6 adress in bytes */
28 #define IPV6_LL_PREFIX 0xFE80000000000000ULL
29 #define IPV6_LL_PREFIX_MASK 0xFFC0000000000000ULL
30 #define IPV6_SOLIC_NODE_PREFIX 0xFF02000000000000ULL
31 #define IPV6_SOLIC_NODE_IFACE_ID 0x00000001FF000000ULL
32
33 /**
34 * An IPv6 Address
35 */
36 typedef union {
37 uint8_t addr[IPV6_ADDR_LENGTH];
38 struct {
39 uint64_t prefix;
40 uint64_t interface_id;
41 } part;
42 } ip6_addr_t;
43
44 typedef struct {
45 uint8_t type;
46 uint8_t pad[7];
47 union {
48 ip6_addr_t v6;
49 char v4[4];
50 } addr;
51 } netaddr_t;
52
53 /** \struct prefix_info
54 *
55 * List of Prefixes we have adresses from
56 * Used for internal purposes, information derived from prefix option
57 * in Router Advertisements
58 * See RFC 4861 section 4.6.2
59 */
60 struct prefix_info {
61 uint64_t prefix;
62 uint8_t on_link:1, /* When set prefix can be used for on-link
63 * determination */
64 autoconf:1, /* Prefix can be used for stateless address
65 * configuration */
66 reserved1:6;
67 uint32_t valid_lifetime; /* Time until prefix expires */
68 uint32_t preferred_lifetime; /* Time until prefix becomes deprecated */
69 uint32_t start_time; /* Time when received */
70 uint32_t reserved2;
71 struct prefix_info *next;
72 };
73
74
75 /* List of IPv6 addresses */
76 struct ip6addr_list_entry {
77 ip6_addr_t addr;
78 struct prefix_info prfx_info;
79 struct ip6addr_list_entry *next;
80 };
81
82 /** \struct ip6hdr
83 * A header for IPv6 packets.
84 * For more information see RFC 2460
85 */
86 struct ip6hdr {
87 uint32_t ver_tc_fl; /**< Version, Traffic class, Flow label */
88 uint16_t pl; /**< Payload length */
89 uint8_t nh; /**< Next header */
90 uint8_t hl; /**< Hop limit */
91 ip6_addr_t src; /**< IPv6 source address */
92 ip6_addr_t dst; /**< IPv6 destination address */
93 } __attribute((packed));
94
95 /** \struct packeth
96 * Struct with pointers to headers within a packet
97 */
98 struct packeth {
99 struct ethhdr *ethh;
100 struct ip6hdr *ip6h;
101 struct icmp6hdr *icmp6h;
102 struct udphdr *udph;
103 /* ... */
104 };
105
106 /** \struct parseip6_state
107 * Stores information about state of IPv6 address parser
108 */
109 struct parseip6_state {
110 char *lookahead;
111 char *ptr;
112 const char *addr;
113 int state;
114 int s1ctr;
115 int s2ctr;
116 int blocknr;
117 int zeroblocks;
118 int i;
119 int done;
120 int errorcode;
121 };
122
123 /** \struct ip6_config
124 * Stores flags wheter we use Stateless- or Stateful Autoconfiguration or DHCPv6
125 */
126 struct ip6_config {
127 uint8_t managed_mode:1,
128 other_config:1,
129 reserved:6;
130 };
131
132 /******************** VARIABLES **********************************************/
133
134 extern struct ip6_config ip6_state;
135
136 /******************** FUNCTIONS *********************************************/
137 /* Handles IPv6-packets that are detected by receive_ether. */
138 int8_t handle_ipv6(int fd, uint8_t * ip6_packet, uint32_t packetsize);
139
140 /* Fill IPv6 header */
141 void fill_ip6hdr(uint8_t * packet, uint16_t packetsize,
142 uint8_t ip_proto, ip6_addr_t *ip6_src, ip6_addr_t *ip6_dst);
143
144 /* Set own IPv6 address */
145 void set_ipv6_address(int fd, ip6_addr_t *own_ip6);
146
147 /* Get own IPv6 address */
148 ip6_addr_t *get_ipv6_address(void);
149
150 /* Create link-local address from a given Mac Address */
151 void ip6_create_ll_address (const uint8_t *own_mac, ip6_addr_t *ll_addr);
152
153 /* For a given MAC calculates EUI64-Identifier.*/
154 uint64_t mac2eui64 (const uint8_t *mac);
155
156 /* Create empty element for prefix list and return a pointer to it */
157 struct prefix_info * ip6_create_prefix_info(void);
158
159 /* Create a new IPv6 address with a given network prefix
160 * and add it to our IPv6 address list */
161 void * ip6_prefix2addr (ip6_addr_t prefix);
162
163 /* Compare IPv6 adresses */
164 int8_t ip6_cmp(ip6_addr_t ip_1, ip6_addr_t ip_2);
165
166 /* Check if it is a link-local address */
ip6_is_linklocal(ip6_addr_t * ip)167 static inline int ip6_is_linklocal(ip6_addr_t *ip)
168 {
169 return (ip->part.prefix & IPV6_LL_PREFIX_MASK) == IPV6_LL_PREFIX;
170 }
171
172 /* Check if prefix is already in our list */
173 int8_t unknown_prefix (ip6_addr_t *ip);
174
175 /* Send IPv6 packet */
176 int send_ipv6 (int fd, void* buffer, int len);
177
178 /* Add IPv6 address to list */
179 int8_t ip6addr_add (struct ip6addr_list_entry *new_address);
180
181 /* Parse an IPv6 address */
182 int parseip6(const char *addr, uint8_t *parsedaddr);
183 int str_to_ipv6(const char *str, uint8_t *ip);
184 void ipv6_to_str(const uint8_t *ip, char *str);
185
186 #endif
187