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
|
/*
* netsniff-ng - the packet sniffing beast
* Copyright 2012 Markus Amend <markus@netsniff-ng.org>, Deutsche Flugsicherung GmbH
* Subject to the GPL, version 2.
*
* IPv6 Routing Header described in RFC2460
*/
#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h> /* for ntohs() and "struct in6_addr" */
#include <arpa/inet.h> /* for inet_ntop() */
#include "proto.h"
#include "protos.h"
#include "dissector_eth.h"
#include "built_in.h"
#include "pkt_buff.h"
#define ROUTING_HEADER_TYPE_0 0x00
struct routinghdr {
uint8_t h_next_header;
uint8_t h_hdr_ext_len;
uint8_t h_routing_type;
uint8_t h_segments_left;
} __packed;
struct routinghdr_0 {
uint32_t reserved;
uint32_t addresses[0];
} __packed;
static void dissect_routinghdr_type_0(struct pkt_buff *pkt,
ssize_t *data_len, int less)
{
uint8_t num_addr;
char address[INET6_ADDRSTRLEN];
struct in6_addr *addr;
struct routinghdr_0 *routing_0;
routing_0 = (struct routinghdr_0 *) pkt_pull(pkt, sizeof(*routing_0));
*data_len -= sizeof(*routing_0);
if (routing_0 == NULL || *data_len > pkt_len(pkt) || *data_len < 0)
return;
if (less) {
tprintf("Addresses (%lu)", *data_len / sizeof(struct in6_addr));
return;
}
tprintf("Res (0x%x)", routing_0->reserved);
num_addr = *data_len / sizeof(*addr);
while (num_addr--) {
addr = (struct in6_addr *) pkt_pull(pkt, sizeof(*addr));
*data_len -= sizeof(*addr);
if (addr == NULL || *data_len > pkt_len(pkt) || *data_len < 0)
return;
tprintf("\n\t Address: %s",
inet_ntop(AF_INET6, addr, address,
sizeof(address)));
}
}
static inline void dissect_routinghdr_type_0_norm(struct pkt_buff *pkt,
ssize_t *data_len)
{
dissect_routinghdr_type_0(pkt, data_len, 0);
}
static inline void dissect_routinghdr_type_0_less(struct pkt_buff *pkt,
ssize_t *data_len)
{
dissect_routinghdr_type_0(pkt, data_len, 1);
}
static void routing(struct pkt_buff *pkt)
{
uint16_t hdr_ext_len;
ssize_t data_len;
struct routinghdr *routing;
routing = (struct routinghdr *) pkt_pull(pkt, sizeof(*routing));
if (routing == NULL)
return;
/* Total Header Length in Bytes */
hdr_ext_len = (routing->h_hdr_ext_len + 1) * 8;
/* Data length in Bytes */
data_len = hdr_ext_len - sizeof(*routing);
tprintf("\t [ Routing ");
tprintf("NextHdr (%u), ", routing->h_next_header);
if (data_len > pkt_len(pkt) || data_len < 0){
tprintf("HdrExtLen (%u, %u Bytes %s), ", routing->h_hdr_ext_len,
hdr_ext_len, colorize_start_full(black, red)
"invalid" colorize_end());
return;
}
tprintf("HdrExtLen (%u, %u Bytes), ", routing->h_hdr_ext_len,
hdr_ext_len);
tprintf("Type (%u), ", routing->h_routing_type);
tprintf("Left (%u), ", routing->h_segments_left);
switch (routing->h_routing_type) {
case ROUTING_HEADER_TYPE_0:
dissect_routinghdr_type_0_norm(pkt, &data_len);
break;
default:
tprintf("Type %u is unknown", routing->h_routing_type);
}
tprintf(" ]\n");
if (data_len > pkt_len(pkt) || data_len < 0)
return;
pkt_pull(pkt, data_len);
pkt_set_proto(pkt, ð_lay3, routing->h_next_header);
}
static void routing_less(struct pkt_buff *pkt)
{
uint16_t hdr_ext_len;
ssize_t data_len;
struct routinghdr *routing;
routing = (struct routinghdr *) pkt_pull(pkt, sizeof(*routing));
if (routing == NULL)
return;
/* Total Header Length in Bytes */
hdr_ext_len = (routing->h_hdr_ext_len + 1) * 8;
/* Data length in Bytes */
data_len = hdr_ext_len - sizeof(*routing);
if (data_len > pkt_len(pkt) || data_len < 0)
return;
tprintf(" Routing ");
switch (routing->h_routing_type) {
case ROUTING_HEADER_TYPE_0:
dissect_routinghdr_type_0_less(pkt, &data_len);
break;
default:
tprintf("Type %u is unknown", routing->h_routing_type);
}
if (data_len > pkt_len(pkt) || data_len < 0)
return;
pkt_pull(pkt, data_len);
pkt_set_proto(pkt, ð_lay3, routing->h_next_header);
}
struct protocol ipv6_routing_ops = {
.key = 0x2B,
.print_full = routing,
.print_less = routing_less,
};
|
