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
|
/******************************************************************************
* 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
*****************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "ipv6.h"
#include "icmpv6.h"
#include "ndp.h"
/* Neighbor cache */
static struct neighbor *first_neighbor;
static struct neighbor *last_neighbor;
/* Router list */
static struct router *first_router;
static struct router *last_router;
/*
* NET: add new router to list
* @param struct router nghb - new router
* @return true or false
*/
int8_t
router_add (struct router *nghb )
{
if (nghb == NULL)
return -1;
if (first_router == NULL) {
first_router= nghb;
last_router = first_router;
last_router->next = NULL;
} else {
last_router->next = nghb;
last_router = nghb;
last_router->next = NULL;
}
return 1; /* no error */
}
/*
* NET: create a new router
* @param uint8_t *packet - received packet (Ethernet/IPv6/ICMPv6/ND_NghSlct)
* @param struct packeth - pointers to headers in packet
* @return pointer to new router
*/
void *
router_create(uint8_t *mac, ip6_addr_t ip)
{
struct router *new_router;
new_router = malloc (sizeof(struct router));
if( !new_router) {
return 0;
}
memset (new_router, 0, sizeof(struct router));
/* fill neighbor struct */
memcpy (new_router->mac, mac, 6);
memcpy (&(new_router->ip.addr[0]), ip.addr, IPV6_ADDR_LENGTH);
return new_router;
}
struct router *
find_router(ip6_addr_t ip)
{
struct router *n = NULL;
for (n = first_router; n != NULL ; n=n->next)
if (ip6_cmp(n->ip, ip))
return n; /* router is already in list*/
return NULL; /* router is unknown */
}
/**
* Find a router for a given host address
* @param ip - IPv6 address with the prefered prefix
* @return pointer to router, or NULL if none is available
*/
struct router *ipv6_get_default_router(ip6_addr_t ip)
{
struct router *n = NULL;
for (n = first_router; n != NULL; n = n->next) {
if (n->ip.part.prefix == ip.part.prefix)
return n;
}
return first_router;
}
/*
* NET: add new neighbor to list
* @param struct neighbor nghb - new neighbor
* @return true or false
*/
int8_t
neighbor_add (struct neighbor *nghb)
{
if (nghb == NULL)
return -1;
if (first_neighbor == NULL) {
first_neighbor = nghb;
last_neighbor = first_neighbor;
last_neighbor->next = NULL;
} else {
last_neighbor->next = nghb;
last_neighbor = nghb;
last_neighbor->next = NULL;
}
return 1; /* no error */
}
/*
* NET: create a new neighbor
* @param uint8_t *packet - received packet (Ethernet/IPv6/ICMPv6/ND_NghSlct)
* @param struct packeth - pointers to headers in packet
* @return pointer - pointer to new neighbor
* NULL - malloc failed
*/
void *
neighbor_create (uint8_t *packet, struct packeth *headers)
{
struct neighbor *new_neighbor;
new_neighbor = malloc (sizeof(struct neighbor));
if( !new_neighbor )
return NULL;
memset(new_neighbor, 0, sizeof(struct neighbor));
/* fill neighbor struct */
memcpy (&(new_neighbor->mac),
&(headers->ethh->src_mac[0]), 6);
memcpy (&(new_neighbor->ip.addr), &(headers->ip6h->src), IPV6_ADDR_LENGTH);
new_neighbor->status = NB_INCOMPLETE;
return new_neighbor;
}
/**
* NET: Find neighbor with given IPv6 address in Neighbor Cache
*
* @param ip - Pointer to IPv6 address
* @return pointer - pointer to client IPv6 address (e.g. ::1)
* NULL - Neighbor not found
*/
struct neighbor *
find_neighbor(ip6_addr_t ip)
{
struct neighbor *n = NULL;
for (n = first_neighbor; n != NULL ; n=n->next) {
if (ip6_cmp(n->ip, ip)) {
return n; /* neighbor is already in cache */
}
}
return NULL; /* neighbor is unknown */
}
void ndp_init(void)
{
/* Router list */
first_router = NULL;
last_router = first_router;
/* Init Neighbour cache */
first_neighbor = NULL;
last_neighbor = first_neighbor;
}
|
