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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/* $OpenBSD: print-ip6.c,v 1.24 2016/12/13 06:40:21 dlg Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifdef INET6
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "interface.h"
#include "addrtoname.h"
#include <netinet/ip6.h>
/*
* print an IP6 datagram.
*/
void
ip6_print(const u_char *bp, u_int length)
{
const struct ip6_hdr *ip6;
int hlen;
int len;
const u_char *cp;
const u_char *pktp = packetp;
const u_char *send = snapend;
int nh;
u_int flow;
ip6 = (const struct ip6_hdr *)bp;
if ((u_char *)(ip6 + 1) > snapend) {
printf("[|ip6]");
return;
}
/*
* The IP header is not word aligned, so copy into abuf.
* This will never happen with BPF. It does happen with
* raw packet dumps from -r.
*/
if ((intptr_t)ip6 & (sizeof(u_int32_t)-1)) {
static u_char *abuf = NULL;
static int didwarn = 0;
int clen = snapend - bp;
if (clen > snaplen)
clen = snaplen;
if (abuf == NULL) {
abuf = malloc(snaplen);
if (abuf == NULL)
error("ip6_print: malloc");
}
memmove((char *)abuf, (char *)ip6, min(length, clen));
snapend = abuf + clen;
packetp = bp = abuf;
ip6 = (struct ip6_hdr *)abuf;
/* We really want libpcap to give us aligned packets */
if (!didwarn) {
warning("compensating for unaligned libpcap packets");
++didwarn;
}
}
if (length < sizeof (struct ip6_hdr)) {
(void)printf("truncated-ip6 %d", length);
goto out;
}
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
(void)printf("bad-ip6-version %u", ip6->ip6_vfc >> 4);
goto out;
}
hlen = sizeof(struct ip6_hdr);
len = ntohs(ip6->ip6_plen);
if (length < len + hlen)
(void)printf("truncated-ip6 - %d bytes missing!",
len + hlen - length);
cp = (const u_char *)ip6;
nh = ip6->ip6_nxt;
while (cp + hlen <= snapend) {
cp += hlen;
#ifndef IPPROTO_IPV4
#define IPPROTO_IPV4 4
#endif
if (cp == (u_char *)(ip6 + 1) &&
nh != IPPROTO_TCP && nh != IPPROTO_UDP &&
nh != IPPROTO_ESP && nh != IPPROTO_AH &&
(vflag || (nh != IPPROTO_IPV4 && nh != IPPROTO_IPV6))) {
(void)printf("%s > %s: ", ip6addr_string(&ip6->ip6_src),
ip6addr_string(&ip6->ip6_dst));
}
switch (nh) {
case IPPROTO_HOPOPTS:
hlen = hbhopt_print(cp);
nh = *cp;
break;
case IPPROTO_DSTOPTS:
hlen = dstopt_print(cp);
nh = *cp;
break;
case IPPROTO_FRAGMENT:
hlen = frag6_print(cp, (const u_char *)ip6);
if (snapend < cp + hlen)
goto end;
nh = *cp;
break;
case IPPROTO_ROUTING:
hlen = rt6_print(cp, (const u_char *)ip6);
nh = *cp;
break;
case IPPROTO_TCP:
tcp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_UDP:
udp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_ESP:
esp_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_AH:
ah_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_ICMPV6:
icmp6_print(cp, len + sizeof(struct ip6_hdr) - (cp - bp),
(const u_char *)ip6);
goto end;
case IPPROTO_PIM:
(void)printf("PIM");
pim_print(cp, len);
goto end;
#ifndef IPPROTO_OSPF
#define IPPROTO_OSPF 89
#endif
case IPPROTO_OSPF:
ospf6_print(cp, len);
goto end;
case IPPROTO_IPV6:
ip6_print(cp, len);
if (! vflag)
printf(" (encap)");
goto end;
case IPPROTO_IPV4:
ip_print(cp, len);
if (! vflag)
printf(" (encap)");
goto end;
#ifndef IPPROTO_GRE
#define IPPROTO_GRE 47
#endif
case IPPROTO_GRE:
gre_print(cp, len);
if (! vflag) {
printf(" (gre encap)");
goto out;
}
goto end;
case IPPROTO_NONE:
(void)printf("no next header");
goto end;
#ifndef IPPROTO_CARP
#define IPPROTO_CARP 112
#endif
case IPPROTO_CARP:
if (packettype == PT_VRRP)
vrrp_print(cp, len, ip6->ip6_hlim);
else
carp_print(cp, len, ip6->ip6_hlim);
break;
default:
(void)printf("ip-proto-%d %d", ip6->ip6_nxt, len);
goto end;
}
if (hlen == 0)
break;
}
end:
flow = ntohl(ip6->ip6_flow);
#if 0
/* rfc1883 */
if (flow & 0x0f000000)
(void)printf(" [pri 0x%x]", (flow & 0x0f000000) >> 24);
if (flow & 0x00ffffff)
(void)printf(" [flowlabel 0x%x]", flow & 0x00ffffff);
#else
/* RFC 2460 */
if (flow & 0x0ff00000)
(void)printf(" [class 0x%x]", (flow & 0x0ff00000) >> 20);
if (flow & 0x000fffff)
(void)printf(" [flowlabel 0x%x]", flow & 0x000fffff);
#endif
if (ip6->ip6_hlim <= 1)
(void)printf(" [hlim %d]", (int)ip6->ip6_hlim);
if (vflag) {
printf(" (");
(void)printf("len %d", len);
if (ip6->ip6_hlim > 1)
(void)printf(", hlim %d", (int)ip6->ip6_hlim);
printf(")");
}
out:
packetp = pktp;
snapend = send;
}
#endif /* INET6 */
|
