print-icmp.c revision 26183 
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
22#ifndef lint
23static const char rcsid[] =
24    "@(#) $Header: print-icmp.c,v 1.38 96/09/26 23:36:44 leres Exp $ (LBL)";
25#endif
26
27#include <sys/param.h>
28#include <sys/time.h>
29#include <sys/socket.h>
30
31#if __STDC__
32struct mbuf;
33struct rtentry;
34#endif
35#include <net/if.h>
36
37#include <netinet/in.h>
38#include <net/ethernet.h>
39#include <netinet/in_systm.h>
40#include <netinet/ip.h>
41#include <netinet/ip_icmp.h>
42#include <netinet/ip_var.h>
43#include <netinet/udp.h>
44#include <netinet/udp_var.h>
45#include <netinet/tcp.h>
46#include <netinet/tcpip.h>
47
48#include <stdio.h>
49#include <string.h>
50
51#include "interface.h"
52#include "addrtoname.h"
53#include "extract.h"			/* must come after interface.h */
54
55/* rfc1700 */
56#ifndef ICMP_UNREACH_NET_UNKNOWN
57#define ICMP_UNREACH_NET_UNKNOWN	6	/* destination net unknown */
58#endif
59#ifndef ICMP_UNREACH_HOST_UNKNOWN
60#define ICMP_UNREACH_HOST_UNKNOWN	7	/* destination host unknown */
61#endif
62#ifndef ICMP_UNREACH_ISOLATED
63#define ICMP_UNREACH_ISOLATED		8	/* source host isolated */
64#endif
65#ifndef ICMP_UNREACH_NET_PROHIB
66#define ICMP_UNREACH_NET_PROHIB		9	/* admin prohibited net */
67#endif
68#ifndef ICMP_UNREACH_HOST_PROHIB
69#define ICMP_UNREACH_HOST_PROHIB	10	/* admin prohibited host */
70#endif
71#ifndef ICMP_UNREACH_TOSNET
72#define ICMP_UNREACH_TOSNET		11	/* tos prohibited net */
73#endif
74#ifndef ICMP_UNREACH_TOSHOST
75#define ICMP_UNREACH_TOSHOST		12	/* tos prohibited host */
76#endif
77
78/* rfc1716 */
79#ifndef ICMP_UNREACH_FILTER_PROHIB
80#define ICMP_UNREACH_FILTER_PROHIB	13	/* admin prohibited filter */
81#endif
82#ifndef ICMP_UNREACH_HOST_PRECEDENCE
83#define ICMP_UNREACH_HOST_PRECEDENCE	14	/* host precedence violation */
84#endif
85#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
86#define ICMP_UNREACH_PRECEDENCE_CUTOFF	15	/* precedence cutoff */
87#endif
88
89/* rfc1256 */
90#ifndef ICMP_ROUTERADVERT
91#define ICMP_ROUTERADVERT		9	/* router advertisement */
92#endif
93#ifndef ICMP_ROUTERSOLICIT
94#define ICMP_ROUTERSOLICIT		10	/* router solicitation */
95#endif
96
97/* Most of the icmp types */
98static struct tok icmp2str[] = {
99	{ ICMP_ECHOREPLY,		"echo reply" },
100	{ ICMP_SOURCEQUENCH,		"source quench" },
101	{ ICMP_ECHO,			"echo request" },
102	{ ICMP_ROUTERSOLICIT,		"router solicitation" },
103	{ ICMP_TSTAMP,			"time stamp request" },
104	{ ICMP_TSTAMPREPLY,		"time stamp reply" },
105	{ ICMP_IREQ,			"information request" },
106	{ ICMP_IREQREPLY,		"information reply" },
107	{ ICMP_MASKREQ,			"address mask request" },
108	{ 0,				NULL }
109};
110
111/* Formats for most of the ICMP_UNREACH codes */
112static struct tok unreach2str[] = {
113	{ ICMP_UNREACH_NET,		"net %s unreachable" },
114	{ ICMP_UNREACH_HOST,		"host %s unreachable" },
115	{ ICMP_UNREACH_SRCFAIL,
116	    "%s unreachable - source route failed" },
117	{ ICMP_UNREACH_NET_UNKNOWN,	"net %s unreachable - unknown" },
118	{ ICMP_UNREACH_HOST_UNKNOWN,	"host %s unreachable - unknown" },
119	{ ICMP_UNREACH_ISOLATED,
120	    "%s unreachable - source host isolated" },
121	{ ICMP_UNREACH_NET_PROHIB,
122	    "net %s unreachable - admin prohibited" },
123	{ ICMP_UNREACH_HOST_PROHIB,
124	    "host %s unreachable - admin prohibited" },
125	{ ICMP_UNREACH_TOSNET,
126	    "net %s unreachable - tos prohibited" },
127	{ ICMP_UNREACH_TOSHOST,
128	    "host %s unreachable - tos prohibited" },
129	{ ICMP_UNREACH_FILTER_PROHIB,
130	    "host %s unreachable - admin prohibited filter" },
131	{ ICMP_UNREACH_HOST_PRECEDENCE,
132	    "host %s unreachable - host precedence violation" },
133	{ ICMP_UNREACH_PRECEDENCE_CUTOFF,
134	    "host %s unreachable - precedence cutoff" },
135	{ 0,				NULL }
136};
137
138/* Formats for the ICMP_REDIRECT codes */
139static struct tok type2str[] = {
140	{ ICMP_REDIRECT_NET,		"redirect %s to net %s" },
141	{ ICMP_REDIRECT_HOST,		"redirect %s to host %s" },
142	{ ICMP_REDIRECT_TOSNET,		"redirect-tos %s to net %s" },
143	{ ICMP_REDIRECT_TOSHOST,	"redirect-tos %s to net %s" },
144	{ 0,				NULL }
145};
146
147/* rfc1191 */
148struct mtu_discovery {
149	short unused;
150	short nexthopmtu;
151};
152
153/* rfc1256 */
154struct ih_rdiscovery {
155	u_char ird_addrnum;
156	u_char ird_addrsiz;
157	u_short ird_lifetime;
158};
159
160struct id_rdiscovery {
161	u_int32_t ird_addr;
162	u_int32_t ird_pref;
163};
164
165void
166icmp_print(register const u_char *bp, register const u_char *bp2)
167{
168	register char *cp;
169	register const struct icmp *dp;
170	register const struct ip *ip;
171	register const char *str, *fmt;
172	register const struct ip *oip;
173	register const struct udphdr *ouh;
174	register u_int hlen, dport, mtu;
175	char buf[256];
176
177	dp = (struct icmp *)bp;
178	ip = (struct ip *)bp2;
179	str = buf;
180
181        (void)printf("%s > %s: ",
182		ipaddr_string(&ip->ip_src),
183		ipaddr_string(&ip->ip_dst));
184
185	TCHECK(dp->icmp_code);
186	switch (dp->icmp_type) {
187
188	case ICMP_UNREACH:
189		TCHECK(dp->icmp_ip.ip_dst);
190		switch (dp->icmp_code) {
191
192		case ICMP_UNREACH_PROTOCOL:
193			TCHECK(dp->icmp_ip.ip_p);
194			(void)sprintf(buf, "%s protocol %d unreachable",
195				       ipaddr_string(&dp->icmp_ip.ip_dst),
196				       dp->icmp_ip.ip_p);
197			break;
198
199		case ICMP_UNREACH_PORT:
200			TCHECK(dp->icmp_ip.ip_p);
201			oip = &dp->icmp_ip;
202			hlen = oip->ip_hl * 4;
203			ouh = (struct udphdr *)(((u_char *)oip) + hlen);
204			dport = ntohs(ouh->uh_dport);
205			switch (oip->ip_p) {
206
207			case IPPROTO_TCP:
208				(void)sprintf(buf,
209					"%s tcp port %s unreachable",
210					ipaddr_string(&oip->ip_dst),
211					tcpport_string(dport));
212				break;
213
214			case IPPROTO_UDP:
215				(void)sprintf(buf,
216					"%s udp port %s unreachable",
217					ipaddr_string(&oip->ip_dst),
218					udpport_string(dport));
219				break;
220
221			default:
222				(void)sprintf(buf,
223					"%s protocol %d port %d unreachable",
224					ipaddr_string(&oip->ip_dst),
225					oip->ip_p, dport);
226				break;
227			}
228			break;
229
230		case ICMP_UNREACH_NEEDFRAG:
231			{
232			register const struct mtu_discovery *mp;
233
234			mp = (struct mtu_discovery *)&dp->icmp_void;
235                        mtu = EXTRACT_16BITS(&mp->nexthopmtu);
236                        if (mtu)
237			    (void)sprintf(buf,
238				"%s unreachable - need to frag (mtu %d)",
239				ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
240                        else
241			    (void)sprintf(buf,
242				"%s unreachable - need to frag",
243				ipaddr_string(&dp->icmp_ip.ip_dst));
244			}
245			break;
246
247		default:
248			fmt = tok2str(unreach2str, "#%d %%s unreachable",
249			    dp->icmp_code);
250			(void)sprintf(buf, fmt,
251			    ipaddr_string(&dp->icmp_ip.ip_dst));
252			break;
253		}
254		break;
255
256	case ICMP_REDIRECT:
257		TCHECK(dp->icmp_ip.ip_dst);
258		fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
259		    dp->icmp_code);
260		(void)sprintf(buf, fmt,
261		    ipaddr_string(&dp->icmp_ip.ip_dst),
262		    ipaddr_string(&dp->icmp_gwaddr));
263		break;
264
265	case ICMP_ROUTERADVERT:
266		{
267		register const struct ih_rdiscovery *ihp;
268		register const struct id_rdiscovery *idp;
269		u_int lifetime, num, size;
270
271		(void)strcpy(buf, "router advertisement");
272		cp = buf + strlen(buf);
273
274		ihp = (struct ih_rdiscovery *)&dp->icmp_void;
275		TCHECK(*ihp);
276		(void)strcpy(cp, " lifetime ");
277		cp = buf + strlen(buf);
278		lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
279		if (lifetime < 60)
280			(void)sprintf(cp, "%u", lifetime);
281		else if (lifetime < 60 * 60)
282			(void)sprintf(cp, "%u:%02u",
283			    lifetime / 60, lifetime % 60);
284		else
285			(void)sprintf(cp, "%u:%02u:%02u",
286			    lifetime / 3600,
287			    (lifetime % 3600) / 60,
288			    lifetime % 60);
289		cp = buf + strlen(buf);
290
291		num = ihp->ird_addrnum;
292		(void)sprintf(cp, " %d:", num);
293		cp = buf + strlen(buf);
294
295		size = ihp->ird_addrsiz;
296		if (size != 2) {
297			(void)sprintf(cp, " [size %d]", size);
298			break;
299		}
300		idp = (struct id_rdiscovery *)&dp->icmp_data;
301		while (num-- > 0) {
302			TCHECK(*idp);
303			(void)sprintf(cp, " {%s %u}",
304			    ipaddr_string(&idp->ird_addr),
305			    EXTRACT_32BITS(&idp->ird_pref));
306			cp = buf + strlen(buf);
307		}
308		}
309		break;
310
311	case ICMP_TIMXCEED:
312		TCHECK(dp->icmp_ip.ip_dst);
313		switch (dp->icmp_code) {
314
315		case ICMP_TIMXCEED_INTRANS:
316			str = "time exceeded in-transit";
317			break;
318
319		case ICMP_TIMXCEED_REASS:
320			str = "ip reassembly time exceeded";
321			break;
322
323		default:
324			(void)sprintf(buf, "time exceeded-#%d", dp->icmp_code);
325			break;
326		}
327		break;
328
329	case ICMP_PARAMPROB:
330		if (dp->icmp_code)
331			(void)sprintf(buf, "parameter problem - code %d",
332					dp->icmp_code);
333		else {
334			TCHECK(dp->icmp_pptr);
335			(void)sprintf(buf, "parameter problem - octet %d",
336					dp->icmp_pptr);
337		}
338		break;
339
340	case ICMP_MASKREPLY:
341		TCHECK(dp->icmp_mask);
342		(void)sprintf(buf, "address mask is 0x%08x",
343		    (u_int32_t)ntohl(dp->icmp_mask));
344		break;
345
346	default:
347		str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
348		break;
349	}
350        (void)printf("icmp: %s", str);
351	return;
352trunc:
353	fputs("[|icmp]", stdout);
354}
355