ip_icmp.c@ 15232

Last change on this file since 15232 was 15230, checked in by vboxsync, 16 years ago
slirp:icmp: look up over sockets, for trace route scenario
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File size: 21.3 KB

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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 udphdr *udp;
143	struct tcphdr *tcp;
144	struct socket head_socket, so;
145	struct in_addr laddr, faddr;
146	u_int lport, fport;
147
148	laddr.s_addr = ~0;
149	faddr.s_addr = ~0;
150
151	lport = ~0;
152	fport = ~0;
153
154
155	switch (ip->ip_p)
156	{
157	case IPPROTO_ICMP:
158	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
159	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
160	{
161	m0 = icm->im_m;
162	ip0 = mtod(m0, struct ip *);
163	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
164	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
165	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
166	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
167	&& icp->icmp_id == icp0->icmp_id
168	&& icp->icmp_seq == icp->icmp_seq)
169	{
170	found = 1;
171	break;
172	}
173	}
174	/*
175	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
176	* from which the IP package has been sent.
177	*/
178	case IPPROTO_UDP:
179	head_socket = &udb;
180	udp = (struct udphdr )((char )ip + (ip->ip_hl >> 2));
181	faddr.s_addr = ip->ip_dst.s_addr;
182	fport = udp->uh_dport;
183	laddr.s_addr = ip->ip_src.s_addr;
184	lport = udp->uh_sport;
185	case IPPROTO_TCP:
186	if (head_socket == NULL)
187	{
188	tcp = (struct tcphdr )((char )ip + (ip->ip_hl >> 2));
189	head_socket = &tcb; /* head_socket could be initialized with udb*/
190	faddr.s_addr = ip->ip_dst.s_addr;
191	fport = tcp->th_dport;
192	laddr.s_addr = ip->ip_src.s_addr;
193	lport = tcp->th_sport;
194	}
195	for (so = head_socket; so != head_socket; so = so->so_next)
196	{
197	/* Should be reaplaced by hash here */
198	if (so->so_faddr.s_addr == faddr.s_addr
199	&& so->so_fport == fport
200	&& so->so_hladdr.s_addr == laddr.s_addr
201	&& so->so_hlport == lport) {
202	icm = malloc(sizeof(struct icmp_msg));
203	icm->im_m = so->so_m;
204	found = 1;
205	}
206	}
207	break;
208	default:
209	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
210	}
211	if (found == 1)
212	return icm;
213
214	return NULL;
215	}
216
217	static int
218	icmp_attach(PNATState pData, struct mbuf *m)
219	{
220	struct icmp_msg *icm;
221	struct ip *ip;
222	ip = mtod(m, struct ip *);
223	Assert(ip->ip_p == IPPROTO_ICMP);
224	icm = malloc(sizeof(struct icmp_msg));
225	icm->im_m = m;
226	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
227	return (0);
228	}
229	#endif /* VBOX_WITH_SLIRP_ICMP */
230
231	/*
232	* Process a received ICMP message.
233	*/
234	void
235	icmp_input(PNATState pData, struct mbuf *m, int hlen)
236	{
237	register struct icmp *icp;
238	register struct ip ip=mtod(m, struct ip );
239	int icmplen=ip->ip_len;
240	int status;
241	uint32_t dst;
242
243	/* int code; */
244
245	DEBUG_CALL("icmp_input");
246	DEBUG_ARG("m = %lx", (long )m);
247	DEBUG_ARG("m_len = %d", m->m_len);
248
249	icmpstat.icps_received++;
250
251	/*
252	* Locate icmp structure in mbuf, and check
253	* that its not corrupted and of at least minimum length.
254	*/
255	if (icmplen < ICMP_MINLEN)
256	{
257	/* min 8 bytes payload */
258	icmpstat.icps_tooshort++;
259	freeit:
260	m_freem(pData, m);
261	goto end_error;
262	}
263
264	m->m_len -= hlen;
265	m->m_data += hlen;
266	icp = mtod(m, struct icmp *);
267	if (cksum(m, icmplen))
268	{
269	icmpstat.icps_checksum++;
270	goto freeit;
271	}
272	m->m_len += hlen;
273	m->m_data -= hlen;
274
275	/* icmpstat.icps_inhist[icp->icmp_type]++; */
276	/* code = icp->icmp_code; */
277
278	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
279	switch (icp->icmp_type)
280	{
281	case ICMP_ECHO:
282	#ifndef VBOX_WITH_SLIRP_ICMP
283	icp->icmp_type = ICMP_ECHOREPLY;
284	#endif /* !VBOX_WITH_SLIRP_ICMP */
285
286	ip->ip_len += hlen; /* since ip_input subtracts this */
287	dst = ip->ip_dst.s_addr;
288	if (dst == alias_addr.s_addr)
289	{
290	#ifdef VBOX_WITH_SLIRP_ICMP
291	icp->icmp_type = ICMP_ECHOREPLY;
292	ip->ip_dst.s_addr = ip->ip_src.s_addr;
293	ip->ip_src.s_addr = dst;
294	#endif /* VBOX_WITH_SLIRP_ICMP */
295	icmp_reflect(pData, m);
296	}
297	else
298	{
299	struct socket *so;
300	struct sockaddr_in addr;
301	#ifndef VBOX_WITH_SLIRP_ICMP
302	if ((so = socreate()) == NULL)
303	goto freeit;
304	if (udp_attach(pData, so) == -1)
305	{
306	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
307	errno,strerror(errno)));
308	sofree(pData, so);
309	m_free(pData, m);
310	goto end_error;
311	}
312	so->so_m = m;
313	so->so_faddr = ip->ip_dst;
314	so->so_fport = htons(7);
315	so->so_laddr = ip->ip_src;
316	so->so_lport = htons(9);
317	so->so_iptos = ip->ip_tos;
318	so->so_type = IPPROTO_ICMP;
319	so->so_state = SS_ISFCONNECTED;
320
321	addr.sin_family = AF_INET;
322	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
323	{
324	/* It's an alias */
325	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
326	{
327	case CTL_DNS:
328	addr.sin_addr = dns_addr;
329	break;
330	case CTL_ALIAS:
331	default:
332	addr.sin_addr = loopback_addr;
333	break;
334	}
335	}
336	else
337	addr.sin_addr = so->so_faddr;
338	addr.sin_port = so->so_fport;
339	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
340	(struct sockaddr *)&addr, sizeof(addr)) == -1)
341	{
342	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
343	errno,strerror(errno)));
344	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
345	udp_detach(pData, so);
346	}
347	#else /* VBOX_WITH_SLIRP_ICMP */
348	# ifdef RT_OS_WINDOWS
349	IP_OPTION_INFORMATION ipopt;
350	int error;
351	# endif
352	addr.sin_family = AF_INET;
353	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
354	{
355	/* It's an alias */
356	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
357	{
358	case CTL_DNS:
359	addr.sin_addr = dns_addr;
360	break;
361	case CTL_ALIAS:
362	default:
363	addr.sin_addr = loopback_addr;
364	break;
365	}
366	}
367	else
368	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
369	icmp_attach(pData, m);
370	/* Send the packet */
371	# ifndef RT_OS_WINDOWS
372	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
373	if (status < 0)
374	{
375	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n", strerror(errno)));
376	}
377	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
378	(struct sockaddr *)&addr, sizeof(addr)) == -1)
379	{
380	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
381	errno,strerror(errno)));
382	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
383	m_free(pData, m);
384	}
385	# else /* RT_OS_WINDOWS */
386	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
387	pData->icmp_socket.so_icmp_id = icp->icmp_id;
388	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
389	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
390	ipopt.Ttl = ip->ip_ttl;
391	status = IcmpSendEcho2(pData->icmp_socket.sh, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
392	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data,
393	icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
394	pData->pvIcmpBuffer, pData->szIcmpBuffer, 0);
395	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
396	{
397	error = GetLastError();
398	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
399	switch (error)
400	{
401	case ERROR_INVALID_PARAMETER:
402	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
403	break;
404	case ERROR_NOT_SUPPORTED:
405	LogRel(("operation is unsupported)\n"));
406	break;
407	case ERROR_NOT_ENOUGH_MEMORY:
408	LogRel(("OOM!!!)\n"));
409	break;
410	case IP_BUF_TOO_SMALL:
411	LogRel(("Buffer too small)\n"));
412	break;
413	default:
414	LogRel(("Other error!!!)\n"));
415	break;
416	}
417	}
418	# endif /* RT_OS_WINDOWS */
419	#endif /* VBOX_WITH_SLIRP_ICMP */
420	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
421	break;
422	case ICMP_UNREACH:
423	/* XXX? report error? close socket? */
424	case ICMP_TIMXCEED:
425	case ICMP_PARAMPROB:
426	case ICMP_SOURCEQUENCH:
427	case ICMP_TSTAMP:
428	case ICMP_MASKREQ:
429	case ICMP_REDIRECT:
430	icmpstat.icps_notsupp++;
431	m_freem(pData, m);
432	break;
433
434	default:
435	icmpstat.icps_badtype++;
436	m_freem(pData, m);
437	} /* switch */
438
439	end_error:
440	/* m is m_free()'d xor put in a socket xor or given to ip_send */
441	;
442	}
443
444
445	/*
446	* Send an ICMP message in response to a situation
447	*
448	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
449	* MUST NOT change this header information.
450	* MUST NOT reply to a multicast/broadcast IP address.
451	* MUST NOT reply to a multicast/broadcast MAC address.
452	* MUST reply to only the first fragment.
453	*/
454	/*
455	* Send ICMP_UNREACH back to the source regarding msrc.
456	* mbuf *msrc is used as a template, but is NOT m_free()'d.
457	* It is reported as the bad ip packet. The header should
458	* be fully correct and in host byte order.
459	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
460	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
461	*/
462
463	#define ICMP_MAXDATALEN (IP_MSS-28)
464	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, char message)
465	{
466	unsigned hlen, shlen, s_ip_len;
467	register struct ip *ip;
468	register struct icmp *icp;
469	register struct mbuf *m;
470
471	DEBUG_CALL("icmp_error");
472	DEBUG_ARG("msrc = %lx", (long )msrc);
473	DEBUG_ARG("msrc_len = %d", msrc->m_len);
474
475	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
476	goto end_error;
477
478	/* check msrc */
479	if (!msrc)
480	goto end_error;
481
482	ip = mtod(msrc, struct ip *);
483	#if DEBUG
484	{
485	char bufa[20], bufb[20];
486	strcpy(bufa, inet_ntoa(ip->ip_src));
487	strcpy(bufb, inet_ntoa(ip->ip_dst));
488	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
489	}
490	#endif
491	if (ip->ip_off & IP_OFFMASK)
492	goto end_error; /* Only reply to fragment 0 */
493
494	shlen=ip->ip_hl << 2;
495	s_ip_len=ip->ip_len;
496	if (ip->ip_p == IPPROTO_ICMP)
497	{
498	icp = (struct icmp )((char )ip + shlen);
499	/*
500	* Assume any unknown ICMP type is an error. This isn't
501	* specified by the RFC, but think about it..
502	*/
503	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
504	goto end_error;
505	}
506
507	/* make a copy */
508	if (!(m=m_get(pData)))
509	goto end_error; /* get mbuf */
510	{
511	int new_m_size;
512	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
513	if (new_m_size>m->m_size)
514	m_inc(m, new_m_size);
515	}
516	memcpy(m->m_data, msrc->m_data, msrc->m_len);
517	m->m_len = msrc->m_len; /* copy msrc to m */
518
519	/* make the header of the reply packet */
520	ip = mtod(m, struct ip *);
521	hlen = sizeof(struct ip ); /* no options in reply */
522
523	/* fill in icmp */
524	m->m_data += hlen;
525	m->m_len -= hlen;
526
527	icp = mtod(m, struct icmp *);
528
529	if (minsize)
530	s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
531	else if (s_ip_len>ICMP_MAXDATALEN) /* maximum size */
532	s_ip_len=ICMP_MAXDATALEN;
533
534	m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
535
536	/* min. size = 8+sizeof(struct ip)+8 */
537
538	icp->icmp_type = type;
539	icp->icmp_code = code;
540	icp->icmp_id = 0;
541	icp->icmp_seq = 0;
542
543	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
544	HTONS(icp->icmp_ip.ip_len);
545	HTONS(icp->icmp_ip.ip_id);
546	HTONS(icp->icmp_ip.ip_off);
547
548	#if DEBUG
549	if (message)
550	{
551	/* DEBUG : append message to ICMP packet */
552	int message_len;
553	char *cpnt;
554	message_len=strlen(message);
555	if (message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
556	cpnt=(char *)m->m_data+m->m_len;
557	memcpy(cpnt, message, message_len);
558	m->m_len+=message_len;
559	}
560	#endif
561
562	icp->icmp_cksum = 0;
563	icp->icmp_cksum = cksum(m, m->m_len);
564
565	m->m_data -= hlen;
566	m->m_len += hlen;
567
568	/* fill in ip */
569	ip->ip_hl = hlen >> 2;
570	ip->ip_len = m->m_len;
571
572	ip->ip_tos=((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
573
574	ip->ip_ttl = MAXTTL;
575	ip->ip_p = IPPROTO_ICMP;
576	ip->ip_dst = ip->ip_src; /* ip adresses */
577	ip->ip_src = alias_addr;
578
579	(void ) ip_output(pData, (struct socket *)NULL, m);
580
581	icmpstat.icps_reflect++;
582
583	end_error:
584	;
585	}
586	#undef ICMP_MAXDATALEN
587
588	/*
589	* Reflect the ip packet back to the source
590	*/
591	void
592	icmp_reflect(PNATState pData, struct mbuf *m)
593	{
594	register struct ip ip = mtod(m, struct ip );
595	int hlen = ip->ip_hl << 2;
596	int optlen = hlen - sizeof(struct ip );
597	register struct icmp *icp;
598
599	/*
600	* Send an icmp packet back to the ip level,
601	* after supplying a checksum.
602	*/
603	m->m_data += hlen;
604	m->m_len -= hlen;
605	icp = mtod(m, struct icmp *);
606
607	icp->icmp_cksum = 0;
608	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
609
610	m->m_data -= hlen;
611	m->m_len += hlen;
612
613	#ifndef VBOX_WITH_SLIRP_ICMP
614	/* fill in ip */
615	if (optlen > 0)
616	{
617	/*
618	* Strip out original options by copying rest of first
619	* mbuf's data back, and adjust the IP length.
620	*/
621	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
622	(unsigned )(m->m_len - hlen));
623	hlen -= optlen;
624	ip->ip_hl = hlen >> 2;
625	ip->ip_len -= optlen;
626	m->m_len -= optlen;
627	}
628	ip->ip_ttl = MAXTTL;
629	{
630	/* swap */
631	struct in_addr icmp_dst;
632	icmp_dst = ip->ip_dst;
633	ip->ip_dst = ip->ip_src;
634	ip->ip_src = icmp_dst;
635	}
636	#endif /* !VBOX_WITH_SLIRP_ICMP */
637
638	(void ) ip_output(pData, (struct socket *)NULL, m);
639
640	icmpstat.icps_reflect++;
641	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15232

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