print-icmp.c revision 56896 
1/*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 1996
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
21 * $FreeBSD: head/contrib/tcpdump/print-icmp.c 56896 2000-01-30 01:05:24Z fenner $
22 */
23
24#ifndef lint
25static const char rcsid[] =
26    "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.43 1999/11/22 04:28:21 fenner Exp $ (LBL)";
27#endif
28
29#ifdef HAVE_CONFIG_H
30#include "config.h"
31#endif
32
33#include <sys/param.h>
34#include <sys/time.h>
35#include <sys/socket.h>
36
37#if __STDC__
38struct mbuf;
39struct rtentry;
40#endif
41#include <net/if.h>
42
43#include <netinet/in.h>
44#include <net/ethernet.h>
45#include <netinet/in_systm.h>
46#include <netinet/ip.h>
47#include <netinet/ip_icmp.h>
48#include <netinet/ip_var.h>
49#include <netinet/udp.h>
50#include <netinet/udp_var.h>
51#include <netinet/tcp.h>
52
53#include <stdio.h>
54#include <string.h>
55
56#include "interface.h"
57#include "addrtoname.h"
58#include "extract.h"			/* must come after interface.h */
59
60/* rfc1700 */
61#ifndef ICMP_UNREACH_NET_UNKNOWN
62#define ICMP_UNREACH_NET_UNKNOWN	6	/* destination net unknown */
63#endif
64#ifndef ICMP_UNREACH_HOST_UNKNOWN
65#define ICMP_UNREACH_HOST_UNKNOWN	7	/* destination host unknown */
66#endif
67#ifndef ICMP_UNREACH_ISOLATED
68#define ICMP_UNREACH_ISOLATED		8	/* source host isolated */
69#endif
70#ifndef ICMP_UNREACH_NET_PROHIB
71#define ICMP_UNREACH_NET_PROHIB		9	/* admin prohibited net */
72#endif
73#ifndef ICMP_UNREACH_HOST_PROHIB
74#define ICMP_UNREACH_HOST_PROHIB	10	/* admin prohibited host */
75#endif
76#ifndef ICMP_UNREACH_TOSNET
77#define ICMP_UNREACH_TOSNET		11	/* tos prohibited net */
78#endif
79#ifndef ICMP_UNREACH_TOSHOST
80#define ICMP_UNREACH_TOSHOST		12	/* tos prohibited host */
81#endif
82
83/* rfc1716 */
84#ifndef ICMP_UNREACH_FILTER_PROHIB
85#define ICMP_UNREACH_FILTER_PROHIB	13	/* admin prohibited filter */
86#endif
87#ifndef ICMP_UNREACH_HOST_PRECEDENCE
88#define ICMP_UNREACH_HOST_PRECEDENCE	14	/* host precedence violation */
89#endif
90#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
91#define ICMP_UNREACH_PRECEDENCE_CUTOFF	15	/* precedence cutoff */
92#endif
93
94/* rfc1256 */
95#ifndef ICMP_ROUTERADVERT
96#define ICMP_ROUTERADVERT		9	/* router advertisement */
97#endif
98#ifndef ICMP_ROUTERSOLICIT
99#define ICMP_ROUTERSOLICIT		10	/* router solicitation */
100#endif
101
102/* Most of the icmp types */
103static struct tok icmp2str[] = {
104	{ ICMP_ECHOREPLY,		"echo reply" },
105	{ ICMP_SOURCEQUENCH,		"source quench" },
106	{ ICMP_ECHO,			"echo request" },
107	{ ICMP_ROUTERSOLICIT,		"router solicitation" },
108	{ ICMP_TSTAMP,			"time stamp request" },
109	{ ICMP_TSTAMPREPLY,		"time stamp reply" },
110	{ ICMP_IREQ,			"information request" },
111	{ ICMP_IREQREPLY,		"information reply" },
112	{ ICMP_MASKREQ,			"address mask request" },
113	{ 0,				NULL }
114};
115
116/* Formats for most of the ICMP_UNREACH codes */
117static struct tok unreach2str[] = {
118	{ ICMP_UNREACH_NET,		"net %s unreachable" },
119	{ ICMP_UNREACH_HOST,		"host %s unreachable" },
120	{ ICMP_UNREACH_SRCFAIL,
121	    "%s unreachable - source route failed" },
122	{ ICMP_UNREACH_NET_UNKNOWN,	"net %s unreachable - unknown" },
123	{ ICMP_UNREACH_HOST_UNKNOWN,	"host %s unreachable - unknown" },
124	{ ICMP_UNREACH_ISOLATED,
125	    "%s unreachable - source host isolated" },
126	{ ICMP_UNREACH_NET_PROHIB,
127	    "net %s unreachable - admin prohibited" },
128	{ ICMP_UNREACH_HOST_PROHIB,
129	    "host %s unreachable - admin prohibited" },
130	{ ICMP_UNREACH_TOSNET,
131	    "net %s unreachable - tos prohibited" },
132	{ ICMP_UNREACH_TOSHOST,
133	    "host %s unreachable - tos prohibited" },
134	{ ICMP_UNREACH_FILTER_PROHIB,
135	    "host %s unreachable - admin prohibited filter" },
136	{ ICMP_UNREACH_HOST_PRECEDENCE,
137	    "host %s unreachable - host precedence violation" },
138	{ ICMP_UNREACH_PRECEDENCE_CUTOFF,
139	    "host %s unreachable - precedence cutoff" },
140	{ 0,				NULL }
141};
142
143/* Formats for the ICMP_REDIRECT codes */
144static struct tok type2str[] = {
145	{ ICMP_REDIRECT_NET,		"redirect %s to net %s" },
146	{ ICMP_REDIRECT_HOST,		"redirect %s to host %s" },
147	{ ICMP_REDIRECT_TOSNET,		"redirect-tos %s to net %s" },
148	{ ICMP_REDIRECT_TOSHOST,	"redirect-tos %s to net %s" },
149	{ 0,				NULL }
150};
151
152/* rfc1191 */
153struct mtu_discovery {
154	short unused;
155	short nexthopmtu;
156};
157
158/* rfc1256 */
159struct ih_rdiscovery {
160	u_char ird_addrnum;
161	u_char ird_addrsiz;
162	u_short ird_lifetime;
163};
164
165struct id_rdiscovery {
166	u_int32_t ird_addr;
167	u_int32_t ird_pref;
168};
169
170void
171icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2)
172{
173	register char *cp;
174	register const struct icmp *dp;
175	register const struct ip *ip;
176	register const char *str, *fmt;
177	register const struct ip *oip;
178	register const struct udphdr *ouh;
179	register u_int hlen, dport, mtu;
180	char buf[256];
181
182	dp = (struct icmp *)bp;
183	ip = (struct ip *)bp2;
184	str = buf;
185
186#if 0
187        (void)printf("%s > %s: ",
188		ipaddr_string(&ip->ip_src),
189		ipaddr_string(&ip->ip_dst));
190#endif
191
192	TCHECK(dp->icmp_code);
193	switch (dp->icmp_type) {
194
195	case ICMP_UNREACH:
196		TCHECK(dp->icmp_ip.ip_dst);
197		switch (dp->icmp_code) {
198
199		case ICMP_UNREACH_PROTOCOL:
200			TCHECK(dp->icmp_ip.ip_p);
201			(void)sprintf(buf, "%s protocol %d unreachable",
202				       ipaddr_string(&dp->icmp_ip.ip_dst),
203				       dp->icmp_ip.ip_p);
204			break;
205
206		case ICMP_UNREACH_PORT:
207			TCHECK(dp->icmp_ip.ip_p);
208			oip = &dp->icmp_ip;
209			hlen = oip->ip_hl * 4;
210			ouh = (struct udphdr *)(((u_char *)oip) + hlen);
211			dport = ntohs(ouh->uh_dport);
212			switch (oip->ip_p) {
213
214			case IPPROTO_TCP:
215				(void)sprintf(buf,
216					"%s tcp port %s unreachable",
217					ipaddr_string(&oip->ip_dst),
218					tcpport_string(dport));
219				break;
220
221			case IPPROTO_UDP:
222				(void)sprintf(buf,
223					"%s udp port %s unreachable",
224					ipaddr_string(&oip->ip_dst),
225					udpport_string(dport));
226				break;
227
228			default:
229				(void)sprintf(buf,
230					"%s protocol %d port %d unreachable",
231					ipaddr_string(&oip->ip_dst),
232					oip->ip_p, dport);
233				break;
234			}
235			break;
236
237		case ICMP_UNREACH_NEEDFRAG:
238			{
239			register const struct mtu_discovery *mp;
240
241			mp = (struct mtu_discovery *)&dp->icmp_void;
242                        mtu = EXTRACT_16BITS(&mp->nexthopmtu);
243                        if (mtu)
244			    (void)sprintf(buf,
245				"%s unreachable - need to frag (mtu %d)",
246				ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
247                        else
248			    (void)sprintf(buf,
249				"%s unreachable - need to frag",
250				ipaddr_string(&dp->icmp_ip.ip_dst));
251			}
252			break;
253
254		default:
255			fmt = tok2str(unreach2str, "#%d %%s unreachable",
256			    dp->icmp_code);
257			(void)sprintf(buf, fmt,
258			    ipaddr_string(&dp->icmp_ip.ip_dst));
259			break;
260		}
261		break;
262
263	case ICMP_REDIRECT:
264		TCHECK(dp->icmp_ip.ip_dst);
265		fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
266		    dp->icmp_code);
267		(void)sprintf(buf, fmt,
268		    ipaddr_string(&dp->icmp_ip.ip_dst),
269		    ipaddr_string(&dp->icmp_gwaddr));
270		break;
271
272	case ICMP_ROUTERADVERT:
273		{
274		register const struct ih_rdiscovery *ihp;
275		register const struct id_rdiscovery *idp;
276		u_int lifetime, num, size;
277
278		(void)strcpy(buf, "router advertisement");
279		cp = buf + strlen(buf);
280
281		ihp = (struct ih_rdiscovery *)&dp->icmp_void;
282		TCHECK(*ihp);
283		(void)strcpy(cp, " lifetime ");
284		cp = buf + strlen(buf);
285		lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
286		if (lifetime < 60)
287			(void)sprintf(cp, "%u", lifetime);
288		else if (lifetime < 60 * 60)
289			(void)sprintf(cp, "%u:%02u",
290			    lifetime / 60, lifetime % 60);
291		else
292			(void)sprintf(cp, "%u:%02u:%02u",
293			    lifetime / 3600,
294			    (lifetime % 3600) / 60,
295			    lifetime % 60);
296		cp = buf + strlen(buf);
297
298		num = ihp->ird_addrnum;
299		(void)sprintf(cp, " %d:", num);
300		cp = buf + strlen(buf);
301
302		size = ihp->ird_addrsiz;
303		if (size != 2) {
304			(void)sprintf(cp, " [size %d]", size);
305			break;
306		}
307		idp = (struct id_rdiscovery *)&dp->icmp_data;
308		while (num-- > 0) {
309			TCHECK(*idp);
310			(void)sprintf(cp, " {%s %u}",
311			    ipaddr_string(&idp->ird_addr),
312			    EXTRACT_32BITS(&idp->ird_pref));
313			cp = buf + strlen(buf);
314		}
315		}
316		break;
317
318	case ICMP_TIMXCEED:
319		TCHECK(dp->icmp_ip.ip_dst);
320		switch (dp->icmp_code) {
321
322		case ICMP_TIMXCEED_INTRANS:
323			str = "time exceeded in-transit";
324			break;
325
326		case ICMP_TIMXCEED_REASS:
327			str = "ip reassembly time exceeded";
328			break;
329
330		default:
331			(void)sprintf(buf, "time exceeded-#%d", dp->icmp_code);
332			break;
333		}
334		break;
335
336	case ICMP_PARAMPROB:
337		if (dp->icmp_code)
338			(void)sprintf(buf, "parameter problem - code %d",
339					dp->icmp_code);
340		else {
341			TCHECK(dp->icmp_pptr);
342			(void)sprintf(buf, "parameter problem - octet %d",
343					dp->icmp_pptr);
344		}
345		break;
346
347	case ICMP_MASKREPLY:
348		TCHECK(dp->icmp_mask);
349		(void)sprintf(buf, "address mask is 0x%08x",
350		    (u_int32_t)ntohl(dp->icmp_mask));
351		break;
352
353	default:
354		str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
355		break;
356	}
357        (void)printf("icmp: %s", str);
358	if (vflag) {
359		if (TTEST2(*bp, plen)) {
360			if (in_cksum((u_short*)dp, plen, 0))
361				printf(" (wrong icmp csum)");
362		}
363	}
364 	if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
365 		bp += 8;
366 		(void)printf(" for ");
367 		ip = (struct ip *)bp;
368 		snaplen = snapend - bp;
369 		ip_print(bp, ntohs(ip->ip_len));
370 	}
371	return;
372trunc:
373	fputs("[|icmp]", stdout);
374}
375