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[tcpdump] / print-icmp.c
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
23 static const char rcsid[] =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.48 2000-07-01 03:39:03 assar Exp $ (LBL)";
25 #endif
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/socket.h>
34
35 struct mbuf;
36 struct rtentry;
37 #include <net/if.h>
38
39 #include <netinet/in.h>
40 #include <netinet/if_ether.h>
41 #include <netinet/in_systm.h>
42 #include <netinet/ip.h>
43 #include <netinet/ip_icmp.h>
44 #include <netinet/ip_var.h>
45 #include <netinet/udp.h>
46 #include <netinet/udp_var.h>
47 #include <netinet/tcp.h>
48
49 #include <stdio.h>
50 #include <string.h>
51
52 #include "interface.h"
53 #include "addrtoname.h"
54 #include "extract.h" /* must come after interface.h */
55
56 /* rfc1700 */
57 #ifndef ICMP_UNREACH_NET_UNKNOWN
58 #define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
59 #endif
60 #ifndef ICMP_UNREACH_HOST_UNKNOWN
61 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
62 #endif
63 #ifndef ICMP_UNREACH_ISOLATED
64 #define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
65 #endif
66 #ifndef ICMP_UNREACH_NET_PROHIB
67 #define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
68 #endif
69 #ifndef ICMP_UNREACH_HOST_PROHIB
70 #define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
71 #endif
72 #ifndef ICMP_UNREACH_TOSNET
73 #define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
74 #endif
75 #ifndef ICMP_UNREACH_TOSHOST
76 #define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
77 #endif
78
79 /* rfc1716 */
80 #ifndef ICMP_UNREACH_FILTER_PROHIB
81 #define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
82 #endif
83 #ifndef ICMP_UNREACH_HOST_PRECEDENCE
84 #define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
85 #endif
86 #ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
87 #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
88 #endif
89
90 /* rfc1256 */
91 #ifndef ICMP_ROUTERADVERT
92 #define ICMP_ROUTERADVERT 9 /* router advertisement */
93 #endif
94 #ifndef ICMP_ROUTERSOLICIT
95 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
96 #endif
97
98 /* Most of the icmp types */
99 static struct tok icmp2str[] = {
100 { ICMP_ECHOREPLY, "echo reply" },
101 { ICMP_SOURCEQUENCH, "source quench" },
102 { ICMP_ECHO, "echo request" },
103 { ICMP_ROUTERSOLICIT, "router solicitation" },
104 { ICMP_TSTAMP, "time stamp request" },
105 { ICMP_TSTAMPREPLY, "time stamp reply" },
106 { ICMP_IREQ, "information request" },
107 { ICMP_IREQREPLY, "information reply" },
108 { ICMP_MASKREQ, "address mask request" },
109 { 0, NULL }
110 };
111
112 /* Formats for most of the ICMP_UNREACH codes */
113 static struct tok unreach2str[] = {
114 { ICMP_UNREACH_NET, "net %s unreachable" },
115 { ICMP_UNREACH_HOST, "host %s unreachable" },
116 { ICMP_UNREACH_SRCFAIL,
117 "%s unreachable - source route failed" },
118 { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
119 { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
120 { ICMP_UNREACH_ISOLATED,
121 "%s unreachable - source host isolated" },
122 { ICMP_UNREACH_NET_PROHIB,
123 "net %s unreachable - admin prohibited" },
124 { ICMP_UNREACH_HOST_PROHIB,
125 "host %s unreachable - admin prohibited" },
126 { ICMP_UNREACH_TOSNET,
127 "net %s unreachable - tos prohibited" },
128 { ICMP_UNREACH_TOSHOST,
129 "host %s unreachable - tos prohibited" },
130 { ICMP_UNREACH_FILTER_PROHIB,
131 "host %s unreachable - admin prohibited filter" },
132 { ICMP_UNREACH_HOST_PRECEDENCE,
133 "host %s unreachable - host precedence violation" },
134 { ICMP_UNREACH_PRECEDENCE_CUTOFF,
135 "host %s unreachable - precedence cutoff" },
136 { 0, NULL }
137 };
138
139 /* Formats for the ICMP_REDIRECT codes */
140 static struct tok type2str[] = {
141 { ICMP_REDIRECT_NET, "redirect %s to net %s" },
142 { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
143 { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
144 { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to net %s" },
145 { 0, NULL }
146 };
147
148 /* rfc1191 */
149 struct mtu_discovery {
150 short unused;
151 short nexthopmtu;
152 };
153
154 /* rfc1256 */
155 struct ih_rdiscovery {
156 u_char ird_addrnum;
157 u_char ird_addrsiz;
158 u_short ird_lifetime;
159 };
160
161 struct id_rdiscovery {
162 u_int32_t ird_addr;
163 u_int32_t ird_pref;
164 };
165
166 void
167 icmp_print(register const u_char *bp, u_int plen, register const u_char *bp2)
168 {
169 register char *cp;
170 register const struct icmp *dp;
171 register const struct ip *ip;
172 register const char *str, *fmt;
173 register const struct ip *oip;
174 register const struct udphdr *ouh;
175 register u_int hlen, dport, mtu;
176 char buf[256];
177
178 dp = (struct icmp *)bp;
179 ip = (struct ip *)bp2;
180 str = buf;
181
182 #if 0
183 (void)printf("%s > %s: ",
184 ipaddr_string(&ip->ip_src),
185 ipaddr_string(&ip->ip_dst));
186 #endif
187
188 TCHECK(dp->icmp_code);
189 switch (dp->icmp_type) {
190
191 case ICMP_UNREACH:
192 TCHECK(dp->icmp_ip.ip_dst);
193 switch (dp->icmp_code) {
194
195 case ICMP_UNREACH_PROTOCOL:
196 TCHECK(dp->icmp_ip.ip_p);
197 (void)snprintf(buf, sizeof(buf),
198 "%s protocol %d unreachable",
199 ipaddr_string(&dp->icmp_ip.ip_dst),
200 dp->icmp_ip.ip_p);
201 break;
202
203 case ICMP_UNREACH_PORT:
204 TCHECK(dp->icmp_ip.ip_p);
205 oip = &dp->icmp_ip;
206 hlen = oip->ip_hl * 4;
207 ouh = (struct udphdr *)(((u_char *)oip) + hlen);
208 dport = ntohs(ouh->uh_dport);
209 switch (oip->ip_p) {
210
211 case IPPROTO_TCP:
212 (void)snprintf(buf, sizeof(buf),
213 "%s tcp port %s unreachable",
214 ipaddr_string(&oip->ip_dst),
215 tcpport_string(dport));
216 break;
217
218 case IPPROTO_UDP:
219 (void)snprintf(buf, sizeof(buf),
220 "%s udp port %s unreachable",
221 ipaddr_string(&oip->ip_dst),
222 udpport_string(dport));
223 break;
224
225 default:
226 (void)snprintf(buf, sizeof(buf),
227 "%s protocol %d port %d unreachable",
228 ipaddr_string(&oip->ip_dst),
229 oip->ip_p, dport);
230 break;
231 }
232 break;
233
234 case ICMP_UNREACH_NEEDFRAG:
235 {
236 register const struct mtu_discovery *mp;
237 mp = (struct mtu_discovery *)&dp->icmp_void;
238 mtu = EXTRACT_16BITS(&mp->nexthopmtu);
239 if (mtu) {
240 (void)snprintf(buf, sizeof(buf),
241 "%s unreachable - need to frag (mtu %d)",
242 ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
243 } else {
244 (void)snprintf(buf, sizeof(buf),
245 "%s unreachable - need to frag",
246 ipaddr_string(&dp->icmp_ip.ip_dst));
247 }
248 }
249 break;
250
251 default:
252 fmt = tok2str(unreach2str, "#%d %%s unreachable",
253 dp->icmp_code);
254 (void)snprintf(buf, sizeof(buf), fmt,
255 ipaddr_string(&dp->icmp_ip.ip_dst));
256 break;
257 }
258 break;
259
260 case ICMP_REDIRECT:
261 TCHECK(dp->icmp_ip.ip_dst);
262 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
263 dp->icmp_code);
264 (void)snprintf(buf, sizeof(buf), fmt,
265 ipaddr_string(&dp->icmp_ip.ip_dst),
266 ipaddr_string(&dp->icmp_gwaddr));
267 break;
268
269 case ICMP_ROUTERADVERT:
270 {
271 register const struct ih_rdiscovery *ihp;
272 register const struct id_rdiscovery *idp;
273 u_int lifetime, num, size;
274
275 (void)snprintf(buf, sizeof(buf), "router advertisement");
276 cp = buf + strlen(buf);
277
278 ihp = (struct ih_rdiscovery *)&dp->icmp_void;
279 TCHECK(*ihp);
280 (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
281 cp = buf + strlen(buf);
282 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
283 if (lifetime < 60) {
284 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
285 lifetime);
286 } else if (lifetime < 60 * 60) {
287 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
288 lifetime / 60, lifetime % 60);
289 } else {
290 (void)snprintf(cp, sizeof(buf) - (cp - buf),
291 "%u:%02u:%02u",
292 lifetime / 3600,
293 (lifetime % 3600) / 60,
294 lifetime % 60);
295 }
296 cp = buf + strlen(buf);
297
298 num = ihp->ird_addrnum;
299 (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
300 cp = buf + strlen(buf);
301
302 size = ihp->ird_addrsiz;
303 if (size != 2) {
304 (void)snprintf(cp, sizeof(buf) - (cp - buf),
305 " [size %d]", size);
306 break;
307 }
308 idp = (struct id_rdiscovery *)&dp->icmp_data;
309 while (num-- > 0) {
310 TCHECK(*idp);
311 (void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
312 ipaddr_string(&idp->ird_addr),
313 EXTRACT_32BITS(&idp->ird_pref));
314 cp = buf + strlen(buf);
315 ++idp;
316 }
317 }
318 break;
319
320 case ICMP_TIMXCEED:
321 TCHECK(dp->icmp_ip.ip_dst);
322 switch (dp->icmp_code) {
323
324 case ICMP_TIMXCEED_INTRANS:
325 str = "time exceeded in-transit";
326 break;
327
328 case ICMP_TIMXCEED_REASS:
329 str = "ip reassembly time exceeded";
330 break;
331
332 default:
333 (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
334 dp->icmp_code);
335 break;
336 }
337 break;
338
339 case ICMP_PARAMPROB:
340 if (dp->icmp_code)
341 (void)snprintf(buf, sizeof(buf),
342 "parameter problem - code %d", dp->icmp_code);
343 else {
344 TCHECK(dp->icmp_pptr);
345 (void)snprintf(buf, sizeof(buf),
346 "parameter problem - octet %d", dp->icmp_pptr);
347 }
348 break;
349
350 case ICMP_MASKREPLY:
351 TCHECK(dp->icmp_mask);
352 (void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
353 (unsigned)ntohl(dp->icmp_mask));
354 break;
355
356 case ICMP_TSTAMP:
357 TCHECK(dp->icmp_seq);
358 (void)sprintf(buf, "time stamp query id %u seq %u",
359 (unsigned)ntohs(dp->icmp_id),
360 (unsigned)ntohs(dp->icmp_seq));
361 break;
362
363 case ICMP_TSTAMPREPLY:
364 TCHECK(dp->icmp_ttime);
365 (void)sprintf(buf, "time stamp reply id %u seq %u : org 0x%lx recv 0x%lx xmit 0x%lx",
366 (unsigned)ntohs(dp->icmp_id),
367 (unsigned)ntohs(dp->icmp_seq),
368 (unsigned long)ntohl(dp->icmp_otime),
369 (unsigned long)ntohl(dp->icmp_rtime),
370 (unsigned long)ntohl(dp->icmp_ttime));
371 break;
372
373 default:
374 str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
375 break;
376 }
377 (void)printf("icmp: %s", str);
378 if (vflag) {
379 if (TTEST2(*bp, plen)) {
380 if (in_cksum((u_short*)dp, plen, 0))
381 printf(" (wrong icmp csum)");
382 }
383 }
384 if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
385 bp += 8;
386 (void)printf(" for ");
387 ip = (struct ip *)bp;
388 snaplen = snapend - bp;
389 ip_print(bp, ntohs(ip->ip_len));
390 }
391 return;
392 trunc:
393 fputs("[|icmp]", stdout);
394 }
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