ip_icmp.c@ 15219

Last change on this file since 15219 was 15219, checked in by vboxsync, 16 years ago
slirp:ICMP: local host ping works now
Property svn:eol-style set to `native`
File size: 19.9 KB

Line
1	/*
2	* Copyright (c) 1982, 1986, 1988, 1993
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 the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 3. All advertising materials mentioning features or use of this software
14	* must display the following acknowledgement:
15	* This product includes software developed by the University of
16	* California, Berkeley and its contributors.
17	* 4. Neither the name of the University nor the names of its contributors
18	* may be used to endorse or promote products derived from this software
19	* without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31	* SUCH DAMAGE.
32	*
33	* @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
34	* ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp
35	*/
36
37	#include "slirp.h"
38	#include "ip_icmp.h"
39	#ifdef RT_OS_WINDOWS
40	#include <Icmpapi.h>
41	#include <Iphlpapi.h>
42	#endif
43
44
45	/* The message sent when emulating PING */
46	/* Be nice and tell them it's just a psuedo-ping packet */
47	static const char icmp_ping_msg[] = "This is a psuedo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
48
49	/* list of actions for icmp_error() on RX of an icmp message */
50	static const int icmp_flush[19] =
51	{
52	/* ECHO REPLY (0) */ 0,
53	1,
54	1,
55	/* DEST UNREACH (3) */ 1,
56	/* SOURCE QUENCH (4)*/ 1,
57	/* REDIRECT (5) */ 1,
58	1,
59	1,
60	/* ECHO (8) */ 0,
61	/* ROUTERADVERT (9) */ 1,
62	/* ROUTERSOLICIT (10) */ 1,
63	/* TIME EXCEEDED (11) */ 1,
64	/* PARAMETER PROBLEM (12) */ 1,
65	/* TIMESTAMP (13) */ 0,
66	/* TIMESTAMP REPLY (14) */ 0,
67	/* INFO (15) */ 0,
68	/* INFO REPLY (16) */ 0,
69	/* ADDR MASK (17) */ 0,
70	/* ADDR MASK REPLY (18) */ 0
71	};
72
73	#ifdef VBOX_WITH_SLIRP_ICMP
74	int
75	icmp_init(PNATState pData)
76	{
77	pData->icmp_socket.so_type = IPPROTO_ICMP;
78	pData->icmp_socket.so_state = SS_ISFCONNECTED;
79	#ifndef RT_OS_WINDOWS
80	pData->icmp_socket.s = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
81	if (pData->icmp_socket.s == -1)
82	{
83	int rc = RTErrConvertFromErrno(errno);
84	LogRel(("NAT: ICMP/ping not available (could open ICMP socket, error %Rrc)\n", rc));
85	return 1;
86	}
87	#else /* RT_OS_WINDOWS */
88	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
89	if (pData->hmIcmpLibrary != NULL)
90	{
91	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
92	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
93	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
94	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
95	}
96	if (pData->pfIcmpParseReplies == NULL)
97	{
98	FreeLibrary(pData->hmIcmpLibrary);
99	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
100	if (pData->hmIcmpLibrary == NULL)
101	{
102	LogRel(("NAT: Icmp.dll could not be loaded\n"));
103	return 1;
104	}
105	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
106	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
107	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
108	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
109	}
110	if (pData->pfIcmpParseReplies == NULL)
111	{
112	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
113	FreeLibrary(pData->hmIcmpLibrary);
114	return 1;
115	}
116	if (pData->pfIcmpCloseHandle == NULL)
117	{
118	LogRel(("NAT: Can't find IcmpCloseHandle symbol\n"));
119	FreeLibrary(pData->hmIcmpLibrary);
120	return 1;
121	}
122	pData->icmp_socket.sh = IcmpCreateFile();
123	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
124	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
125	pData->pvIcmpBuffer = malloc(pData->szIcmpBuffer);
126	#endif /* RT_OS_WINDOWS */
127	LIST_INIT(&pData->icmp_msg_head);
128	return 0;
129	}
130
131	/*
132	* ip here is ip header + 64bytes readed from ICMP packet
133	*/
134	struct icmp_msg *
135	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
136	{
137	struct mbuf *m0;
138	struct ip *ip0;
139	struct icmp icp, icp0;
140	struct icmp_msg *icm = NULL;
141	int found = 0;
142	struct socket *head_socket;
143	struct in_addr laddr, faddr;
144	u_int lport, fport;
145
146	switch (ip->ip_p)
147	{
148	case IPPROTO_ICMP:
149	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
150	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
151	{
152	m0 = icm->im_m;
153	ip0 = mtod(m0, struct ip *);
154	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
155	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
156	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
157	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
158	&& icp->icmp_id == icp0->icmp_id
159	&& icp->icmp_seq == icp->icmp_seq)
160	{
161	found = 1;
162	break;
163	}
164	}
165	case IPPROTO_UDP:
166	head_socket = &udb;
167	case IPPROTO_TCP:
168	head_socket = (head_socket != NULL ? head_socket : &tcb); /* head_socket could be initialized with udb*/
169	}
170	if (found == 1)
171	return icm;
172
173	return NULL;
174	}
175
176	static int
177	icmp_attach(PNATState pData, struct mbuf *m)
178	{
179	struct icmp_msg *icm;
180	struct ip *ip;
181	ip = mtod(m, struct ip *);
182	Assert(ip->ip_p == IPPROTO_ICMP);
183	icm = malloc(sizeof(struct icmp_msg));
184	icm->im_m = m;
185	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
186	return (0);
187	}
188	#endif /* VBOX_WITH_SLIRP_ICMP */
189
190	/*
191	* Process a received ICMP message.
192	*/
193	void
194	icmp_input(PNATState pData, struct mbuf *m, int hlen)
195	{
196	register struct icmp *icp;
197	register struct ip ip=mtod(m, struct ip );
198	int icmplen=ip->ip_len;
199	int status;
200	#ifdef VBOX_WITH_SLIRP_ICMP
201	uint32_t dst;
202	#endif
203
204	/* int code; */
205
206	DEBUG_CALL("icmp_input");
207	DEBUG_ARG("m = %lx", (long )m);
208	DEBUG_ARG("m_len = %d", m->m_len);
209
210	icmpstat.icps_received++;
211
212	/*
213	* Locate icmp structure in mbuf, and check
214	* that its not corrupted and of at least minimum length.
215	*/
216	if (icmplen < ICMP_MINLEN)
217	{
218	/* min 8 bytes payload */
219	icmpstat.icps_tooshort++;
220	freeit:
221	m_freem(pData, m);
222	goto end_error;
223	}
224
225	m->m_len -= hlen;
226	m->m_data += hlen;
227	icp = mtod(m, struct icmp *);
228	if (cksum(m, icmplen))
229	{
230	icmpstat.icps_checksum++;
231	goto freeit;
232	}
233	m->m_len += hlen;
234	m->m_data -= hlen;
235
236	/* icmpstat.icps_inhist[icp->icmp_type]++; */
237	/* code = icp->icmp_code; */
238
239	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
240	switch (icp->icmp_type)
241	{
242	case ICMP_ECHO:
243	#ifndef VBOX_WITH_SLIRP_ICMP
244	icp->icmp_type = ICMP_ECHOREPLY;
245	#endif /* !VBOX_WITH_SLIRP_ICMP */
246
247	ip->ip_len += hlen; /* since ip_input subtracts this */
248	dst = ip->ip_dst.s_addr;
249	if (dst == alias_addr.s_addr)
250	{
251	#ifdef VBOX_WITH_SLIRP_ICMP
252	icp->icmp_type = ICMP_ECHOREPLY;
253	ip->ip_dst.s_addr = ip->ip_src.s_addr;
254	ip->ip_src.s_addr = dst;
255	#endif /* VBOX_WITH_SLIRP_ICMP */
256	icmp_reflect(pData, m);
257	}
258	else
259	{
260	struct socket *so;
261	struct sockaddr_in addr;
262	#ifndef VBOX_WITH_SLIRP_ICMP
263	if ((so = socreate()) == NULL)
264	goto freeit;
265	if (udp_attach(pData, so) == -1)
266	{
267	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
268	errno,strerror(errno)));
269	sofree(pData, so);
270	m_free(pData, m);
271	goto end_error;
272	}
273	so->so_m = m;
274	so->so_faddr = ip->ip_dst;
275	so->so_fport = htons(7);
276	so->so_laddr = ip->ip_src;
277	so->so_lport = htons(9);
278	so->so_iptos = ip->ip_tos;
279	so->so_type = IPPROTO_ICMP;
280	so->so_state = SS_ISFCONNECTED;
281
282	addr.sin_family = AF_INET;
283	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
284	{
285	/* It's an alias */
286	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
287	{
288	case CTL_DNS:
289	addr.sin_addr = dns_addr;
290	break;
291	case CTL_ALIAS:
292	default:
293	addr.sin_addr = loopback_addr;
294	break;
295	}
296	}
297	else
298	addr.sin_addr = so->so_faddr;
299	addr.sin_port = so->so_fport;
300	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
301	(struct sockaddr *)&addr, sizeof(addr)) == -1)
302	{
303	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
304	errno,strerror(errno)));
305	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
306	udp_detach(pData, so);
307	}
308	#else /* VBOX_WITH_SLIRP_ICMP */
309	# ifdef RT_OS_WINDOWS
310	IP_OPTION_INFORMATION ipopt;
311	int error;
312	# endif
313	addr.sin_family = AF_INET;
314	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
315	{
316	/* It's an alias */
317	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
318	{
319	case CTL_DNS:
320	addr.sin_addr = dns_addr;
321	break;
322	case CTL_ALIAS:
323	default:
324	addr.sin_addr = loopback_addr;
325	break;
326	}
327	}
328	else
329	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
330	icmp_attach(pData, m);
331	/* Send the packet */
332	# ifndef RT_OS_WINDOWS
333	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
334	if (status < 0)
335	{
336	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n", strerror(errno)));
337	}
338	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
339	(struct sockaddr *)&addr, sizeof(addr)) == -1)
340	{
341	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
342	errno,strerror(errno)));
343	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
344	m_free(pData, m);
345	}
346	# else /* RT_OS_WINDOWS */
347	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
348	pData->icmp_socket.so_icmp_id = icp->icmp_id;
349	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
350	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
351	ipopt.Ttl = ip->ip_ttl;
352	status = IcmpSendEcho2(pData->icmp_socket.sh, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
353	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data,
354	icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
355	pData->pvIcmpBuffer, pData->szIcmpBuffer, 0);
356	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
357	{
358	error = GetLastError();
359	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
360	switch (error)
361	{
362	case ERROR_INVALID_PARAMETER:
363	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
364	break;
365	case ERROR_NOT_SUPPORTED:
366	LogRel(("operation is unsupported)\n"));
367	break;
368	case ERROR_NOT_ENOUGH_MEMORY:
369	LogRel(("OOM!!!)\n"));
370	break;
371	case IP_BUF_TOO_SMALL:
372	LogRel(("Buffer too small)\n"));
373	break;
374	default:
375	LogRel(("Other error!!!)\n"));
376	break;
377	}
378	}
379	# endif /* RT_OS_WINDOWS */
380	#endif /* VBOX_WITH_SLIRP_ICMP */
381	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
382	break;
383	case ICMP_UNREACH:
384	/* XXX? report error? close socket? */
385	case ICMP_TIMXCEED:
386	case ICMP_PARAMPROB:
387	case ICMP_SOURCEQUENCH:
388	case ICMP_TSTAMP:
389	case ICMP_MASKREQ:
390	case ICMP_REDIRECT:
391	icmpstat.icps_notsupp++;
392	m_freem(pData, m);
393	break;
394
395	default:
396	icmpstat.icps_badtype++;
397	m_freem(pData, m);
398	} /* switch */
399
400	end_error:
401	/* m is m_free()'d xor put in a socket xor or given to ip_send */
402	;
403	}
404
405
406	/*
407	* Send an ICMP message in response to a situation
408	*
409	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
410	* MUST NOT change this header information.
411	* MUST NOT reply to a multicast/broadcast IP address.
412	* MUST NOT reply to a multicast/broadcast MAC address.
413	* MUST reply to only the first fragment.
414	*/
415	/*
416	* Send ICMP_UNREACH back to the source regarding msrc.
417	* mbuf *msrc is used as a template, but is NOT m_free()'d.
418	* It is reported as the bad ip packet. The header should
419	* be fully correct and in host byte order.
420	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
421	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
422	*/
423
424	#define ICMP_MAXDATALEN (IP_MSS-28)
425	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, char message)
426	{
427	unsigned hlen, shlen, s_ip_len;
428	register struct ip *ip;
429	register struct icmp *icp;
430	register struct mbuf *m;
431
432	DEBUG_CALL("icmp_error");
433	DEBUG_ARG("msrc = %lx", (long )msrc);
434	DEBUG_ARG("msrc_len = %d", msrc->m_len);
435
436	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
437	goto end_error;
438
439	/* check msrc */
440	if (!msrc)
441	goto end_error;
442
443	ip = mtod(msrc, struct ip *);
444	#if DEBUG
445	{
446	char bufa[20], bufb[20];
447	strcpy(bufa, inet_ntoa(ip->ip_src));
448	strcpy(bufb, inet_ntoa(ip->ip_dst));
449	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
450	}
451	#endif
452	if (ip->ip_off & IP_OFFMASK)
453	goto end_error; /* Only reply to fragment 0 */
454
455	shlen=ip->ip_hl << 2;
456	s_ip_len=ip->ip_len;
457	if (ip->ip_p == IPPROTO_ICMP)
458	{
459	icp = (struct icmp )((char )ip + shlen);
460	/*
461	* Assume any unknown ICMP type is an error. This isn't
462	* specified by the RFC, but think about it..
463	*/
464	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
465	goto end_error;
466	}
467
468	/* make a copy */
469	if (!(m=m_get(pData)))
470	goto end_error; /* get mbuf */
471	{
472	int new_m_size;
473	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
474	if (new_m_size>m->m_size)
475	m_inc(m, new_m_size);
476	}
477	memcpy(m->m_data, msrc->m_data, msrc->m_len);
478	m->m_len = msrc->m_len; /* copy msrc to m */
479
480	/* make the header of the reply packet */
481	ip = mtod(m, struct ip *);
482	hlen = sizeof(struct ip ); /* no options in reply */
483
484	/* fill in icmp */
485	m->m_data += hlen;
486	m->m_len -= hlen;
487
488	icp = mtod(m, struct icmp *);
489
490	if (minsize)
491	s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
492	else if (s_ip_len>ICMP_MAXDATALEN) /* maximum size */
493	s_ip_len=ICMP_MAXDATALEN;
494
495	m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
496
497	/* min. size = 8+sizeof(struct ip)+8 */
498
499	icp->icmp_type = type;
500	icp->icmp_code = code;
501	icp->icmp_id = 0;
502	icp->icmp_seq = 0;
503
504	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
505	HTONS(icp->icmp_ip.ip_len);
506	HTONS(icp->icmp_ip.ip_id);
507	HTONS(icp->icmp_ip.ip_off);
508
509	#if DEBUG
510	if (message)
511	{
512	/* DEBUG : append message to ICMP packet */
513	int message_len;
514	char *cpnt;
515	message_len=strlen(message);
516	if (message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
517	cpnt=(char *)m->m_data+m->m_len;
518	memcpy(cpnt, message, message_len);
519	m->m_len+=message_len;
520	}
521	#endif
522
523	icp->icmp_cksum = 0;
524	icp->icmp_cksum = cksum(m, m->m_len);
525
526	m->m_data -= hlen;
527	m->m_len += hlen;
528
529	/* fill in ip */
530	ip->ip_hl = hlen >> 2;
531	ip->ip_len = m->m_len;
532
533	ip->ip_tos=((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
534
535	ip->ip_ttl = MAXTTL;
536	ip->ip_p = IPPROTO_ICMP;
537	ip->ip_dst = ip->ip_src; /* ip adresses */
538	ip->ip_src = alias_addr;
539
540	(void ) ip_output(pData, (struct socket *)NULL, m);
541
542	icmpstat.icps_reflect++;
543
544	end_error:
545	;
546	}
547	#undef ICMP_MAXDATALEN
548
549	/*
550	* Reflect the ip packet back to the source
551	*/
552	void
553	icmp_reflect(PNATState pData, struct mbuf *m)
554	{
555	register struct ip ip = mtod(m, struct ip );
556	int hlen = ip->ip_hl << 2;
557	int optlen = hlen - sizeof(struct ip );
558	register struct icmp *icp;
559
560	/*
561	* Send an icmp packet back to the ip level,
562	* after supplying a checksum.
563	*/
564	m->m_data += hlen;
565	m->m_len -= hlen;
566	icp = mtod(m, struct icmp *);
567
568	icp->icmp_cksum = 0;
569	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
570
571	m->m_data -= hlen;
572	m->m_len += hlen;
573
574	#ifndef VBOX_WITH_SLIRP_ICMP
575	/* fill in ip */
576	if (optlen > 0)
577	{
578	/*
579	* Strip out original options by copying rest of first
580	* mbuf's data back, and adjust the IP length.
581	*/
582	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
583	(unsigned )(m->m_len - hlen));
584	hlen -= optlen;
585	ip->ip_hl = hlen >> 2;
586	ip->ip_len -= optlen;
587	m->m_len -= optlen;
588	}
589	ip->ip_ttl = MAXTTL;
590	{
591	/* swap */
592	struct in_addr icmp_dst;
593	icmp_dst = ip->ip_dst;
594	ip->ip_dst = ip->ip_src;
595	ip->ip_src = icmp_dst;
596	}
597	#endif /* !VBOX_WITH_SLIRP_ICMP */
598
599	(void ) ip_output(pData, (struct socket *)NULL, m);
600
601	icmpstat.icps_reflect++;
602	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15219

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