ip_icmp.c@ 15355

Last change on this file since 15355 was 15355, checked in by vboxsync, 16 years ago
slirp:icmp: enabling UDP traceroute on Unix
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File size: 22.2 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	# ifndef RT_OS_DARWIN
81	pData->icmp_socket.s = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
82	# else /* !RT_OS_DARWIN */
83	pData->icmp_socket.s = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
84	# endif /* RT_OS_DARWIN */
85	if (pData->icmp_socket.s == -1)
86	{
87	int rc = RTErrConvertFromErrno(errno);
88	LogRel(("NAT: ICMP/ping not available (could open ICMP socket, error %Rrc)\n", rc));
89	return 1;
90	}
91	#else /* RT_OS_WINDOWS */
92	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
93	if (pData->hmIcmpLibrary != NULL)
94	{
95	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
96	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
97	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
98	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
99	}
100	if (pData->pfIcmpParseReplies == NULL)
101	{
102	FreeLibrary(pData->hmIcmpLibrary);
103	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
104	if (pData->hmIcmpLibrary == NULL)
105	{
106	LogRel(("NAT: Icmp.dll could not be loaded\n"));
107	return 1;
108	}
109	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
110	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
111	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
112	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
113	}
114	if (pData->pfIcmpParseReplies == NULL)
115	{
116	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
117	FreeLibrary(pData->hmIcmpLibrary);
118	return 1;
119	}
120	if (pData->pfIcmpCloseHandle == NULL)
121	{
122	LogRel(("NAT: Can't find IcmpCloseHandle symbol\n"));
123	FreeLibrary(pData->hmIcmpLibrary);
124	return 1;
125	}
126	pData->icmp_socket.sh = IcmpCreateFile();
127	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
128	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
129	pData->pvIcmpBuffer = malloc(pData->szIcmpBuffer);
130	#endif /* RT_OS_WINDOWS */
131	LIST_INIT(&pData->icmp_msg_head);
132	return 0;
133	}
134
135	/*
136	* ip here is ip header + 64bytes readed from ICMP packet
137	*/
138	struct icmp_msg *
139	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
140	{
141	struct mbuf *m0;
142	struct ip *ip0;
143	struct icmp icp, icp0;
144	struct icmp_msg *icm = NULL;
145	int found = 0;
146	struct udphdr *udp;
147	struct tcphdr *tcp;
148	struct socket head_socket, so;
149	struct in_addr laddr, faddr;
150	u_int lport, fport;
151
152	laddr.s_addr = ~0;
153	faddr.s_addr = ~0;
154
155	lport = ~0;
156	fport = ~0;
157
158
159	LogRel(("%s: processing (proto:%d)\n", __FUNCTION__, ip->ip_p));
160	switch (ip->ip_p)
161	{
162	case IPPROTO_ICMP:
163	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
164	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
165	{
166	m0 = icm->im_m;
167	ip0 = mtod(m0, struct ip *);
168	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
169	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
170	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
171	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
172	&& icp->icmp_id == icp0->icmp_id
173	&& icp->icmp_seq == icp->icmp_seq)
174	{
175	found = 1;
176	break;
177	}
178	LogRel(("Have found nothing\n"));
179	}
180	break;
181
182	/*
183	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
184	* from which the IP package has been sent.
185	*/
186	case IPPROTO_UDP:
187	head_socket = &udb;
188	udp = (struct udphdr )((char )ip + (ip->ip_hl << 2));
189	faddr.s_addr = ip->ip_dst.s_addr;
190	fport = udp->uh_dport;
191	laddr.s_addr = ip->ip_src.s_addr;
192	lport = udp->uh_sport;
193	/* fall through */
194
195	case IPPROTO_TCP:
196	if (head_socket == NULL)
197	{
198	tcp = (struct tcphdr )((char )ip + (ip->ip_hl << 2));
199	head_socket = &tcb; /* head_socket could be initialized with udb*/
200	faddr.s_addr = ip->ip_dst.s_addr;
201	fport = tcp->th_dport;
202	laddr.s_addr = ip->ip_src.s_addr;
203	lport = tcp->th_sport;
204	}
205	for (so = head_socket->so_next; so != head_socket; so = so->so_next)
206	{
207	/* Should be reaplaced by hash here */
208	LogRel(("trying:%R[natsock] against %R[IP4]:%d lport=%d hlport=%d\n", so, &faddr, fport, lport, so->so_hlport));
209	if ( so->so_faddr.s_addr == faddr.s_addr
210	&& so->so_fport == fport
211	#if 0
212	&& so->so_hladdr.s_addr == laddr.s_addr
213	#endif
214	&& so->so_hlport == lport)
215	{
216	icm = malloc(sizeof(struct icmp_msg));
217	icm->im_m = so->so_m;
218	found = 1;
219	LogRel(("hit:%R[natsock]\n", so));
220	/*XXX: this storage not very long,
221	* better add flag if it should removed from lis
222	*/
223	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
224	break;
225	}
226	}
227	break;
228
229	default:
230	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
231	}
232	if (found == 1)
233	return icm;
234
235	return NULL;
236	}
237
238	static int
239	icmp_attach(PNATState pData, struct mbuf *m)
240	{
241	struct icmp_msg *icm;
242	struct ip *ip;
243	ip = mtod(m, struct ip *);
244	Assert(ip->ip_p == IPPROTO_ICMP);
245	icm = malloc(sizeof(struct icmp_msg));
246	icm->im_m = m;
247	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
248	return 0;
249	}
250	#endif /* VBOX_WITH_SLIRP_ICMP */
251
252	/*
253	* Process a received ICMP message.
254	*/
255	void
256	icmp_input(PNATState pData, struct mbuf *m, int hlen)
257	{
258	register struct icmp *icp;
259	register struct ip ip = mtod(m, struct ip );
260	int icmplen = ip->ip_len;
261	int status;
262	uint32_t dst;
263
264	/* int code; */
265
266	DEBUG_CALL("icmp_input");
267	DEBUG_ARG("m = %lx", (long )m);
268	DEBUG_ARG("m_len = %d", m->m_len);
269
270	icmpstat.icps_received++;
271
272	/*
273	* Locate icmp structure in mbuf, and check
274	* that its not corrupted and of at least minimum length.
275	*/
276	if (icmplen < ICMP_MINLEN)
277	{
278	/* min 8 bytes payload */
279	icmpstat.icps_tooshort++;
280	freeit:
281	m_freem(pData, m);
282	goto end_error;
283	}
284
285	m->m_len -= hlen;
286	m->m_data += hlen;
287	icp = mtod(m, struct icmp *);
288	if (cksum(m, icmplen))
289	{
290	icmpstat.icps_checksum++;
291	goto freeit;
292	}
293	m->m_len += hlen;
294	m->m_data -= hlen;
295
296	/* icmpstat.icps_inhist[icp->icmp_type]++; */
297	/* code = icp->icmp_code; */
298
299	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
300	switch (icp->icmp_type)
301	{
302	case ICMP_ECHO:
303	#ifndef VBOX_WITH_SLIRP_ICMP
304	icp->icmp_type = ICMP_ECHOREPLY;
305	#endif /* !VBOX_WITH_SLIRP_ICMP */
306
307	ip->ip_len += hlen; /* since ip_input subtracts this */
308	dst = ip->ip_dst.s_addr;
309	if (dst == alias_addr.s_addr)
310	{
311	#ifdef VBOX_WITH_SLIRP_ICMP
312	icp->icmp_type = ICMP_ECHOREPLY;
313	ip->ip_dst.s_addr = ip->ip_src.s_addr;
314	ip->ip_src.s_addr = dst;
315	#endif /* VBOX_WITH_SLIRP_ICMP */
316	icmp_reflect(pData, m);
317	}
318	else
319	{
320	struct socket *so;
321	struct sockaddr_in addr;
322	#ifndef VBOX_WITH_SLIRP_ICMP
323	if ((so = socreate()) == NULL)
324	goto freeit;
325	if (udp_attach(pData, so) == -1)
326	{
327	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
328	errno,strerror(errno)));
329	sofree(pData, so);
330	m_free(pData, m);
331	goto end_error;
332	}
333	so->so_m = m;
334	so->so_faddr = ip->ip_dst;
335	so->so_fport = htons(7);
336	so->so_laddr = ip->ip_src;
337	so->so_lport = htons(9);
338	so->so_iptos = ip->ip_tos;
339	so->so_type = IPPROTO_ICMP;
340	so->so_state = SS_ISFCONNECTED;
341
342	addr.sin_family = AF_INET;
343	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
344	{
345	/* It's an alias */
346	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
347	{
348	case CTL_DNS:
349	addr.sin_addr = dns_addr;
350	break;
351	case CTL_ALIAS:
352	default:
353	addr.sin_addr = loopback_addr;
354	break;
355	}
356	}
357	else
358	addr.sin_addr = so->so_faddr;
359	addr.sin_port = so->so_fport;
360	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
361	(struct sockaddr *)&addr, sizeof(addr)) == -1)
362	{
363	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
364	errno,strerror(errno)));
365	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
366	udp_detach(pData, so);
367	}
368	#else /* VBOX_WITH_SLIRP_ICMP */
369	# ifdef RT_OS_WINDOWS
370	IP_OPTION_INFORMATION ipopt;
371	int error;
372	# endif
373	addr.sin_family = AF_INET;
374	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
375	{
376	/* It's an alias */
377	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
378	{
379	case CTL_DNS:
380	addr.sin_addr = dns_addr;
381	break;
382	case CTL_ALIAS:
383	default:
384	addr.sin_addr = loopback_addr;
385	break;
386	}
387	}
388	else
389	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
390	icmp_attach(pData, m);
391	/* Send the packet */
392	# ifndef RT_OS_WINDOWS
393	LogRel(("NAT/ICMP: try to set TTL(%d)\n", ip->ip_ttl));
394	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
395	if (status < 0)
396	{
397	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n", strerror(errno)));
398	}
399	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
400	(struct sockaddr *)&addr, sizeof(addr)) == -1)
401	{
402	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
403	errno,strerror(errno)));
404	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
405	m_free(pData, m);
406	}
407	# else /* RT_OS_WINDOWS */
408	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
409	pData->icmp_socket.so_icmp_id = icp->icmp_id;
410	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
411	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
412	ipopt.Ttl = ip->ip_ttl;
413	status = IcmpSendEcho2(pData->icmp_socket.sh, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
414	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data,
415	icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
416	pData->pvIcmpBuffer, pData->szIcmpBuffer, 1);
417	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
418	{
419	error = GetLastError();
420	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
421	switch (error)
422	{
423	case ERROR_INVALID_PARAMETER:
424	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
425	break;
426	case ERROR_NOT_SUPPORTED:
427	LogRel(("operation is unsupported)\n"));
428	break;
429	case ERROR_NOT_ENOUGH_MEMORY:
430	LogRel(("OOM!!!)\n"));
431	break;
432	case IP_BUF_TOO_SMALL:
433	LogRel(("Buffer too small)\n"));
434	break;
435	default:
436	LogRel(("Other error!!!)\n"));
437	break;
438	}
439	}
440	# endif /* RT_OS_WINDOWS */
441	#endif /* VBOX_WITH_SLIRP_ICMP */
442	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
443	break;
444	case ICMP_UNREACH:
445	/* XXX? report error? close socket? */
446	case ICMP_TIMXCEED:
447	case ICMP_PARAMPROB:
448	case ICMP_SOURCEQUENCH:
449	case ICMP_TSTAMP:
450	case ICMP_MASKREQ:
451	case ICMP_REDIRECT:
452	icmpstat.icps_notsupp++;
453	m_freem(pData, m);
454	break;
455
456	default:
457	icmpstat.icps_badtype++;
458	m_freem(pData, m);
459	} /* switch */
460
461	end_error:
462	/* m is m_free()'d xor put in a socket xor or given to ip_send */
463	;
464	}
465
466
467	/*
468	* Send an ICMP message in response to a situation
469	*
470	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
471	* MUST NOT change this header information.
472	* MUST NOT reply to a multicast/broadcast IP address.
473	* MUST NOT reply to a multicast/broadcast MAC address.
474	* MUST reply to only the first fragment.
475	*/
476	/*
477	* Send ICMP_UNREACH back to the source regarding msrc.
478	* mbuf *msrc is used as a template, but is NOT m_free()'d.
479	* It is reported as the bad ip packet. The header should
480	* be fully correct and in host byte order.
481	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
482	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
483	*/
484
485	#define ICMP_MAXDATALEN (IP_MSS-28)
486	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, const char message)
487	{
488	unsigned hlen, shlen, s_ip_len;
489	register struct ip *ip;
490	register struct icmp *icp;
491	register struct mbuf *m;
492
493	DEBUG_CALL("icmp_error");
494	DEBUG_ARG("msrc = %lx", (long )msrc);
495	DEBUG_ARG("msrc_len = %d", msrc->m_len);
496
497	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
498	goto end_error;
499
500	/* check msrc */
501	if (!msrc)
502	goto end_error;
503
504	ip = mtod(msrc, struct ip *);
505	#if DEBUG
506	{
507	char bufa[20], bufb[20];
508	strcpy(bufa, inet_ntoa(ip->ip_src));
509	strcpy(bufb, inet_ntoa(ip->ip_dst));
510	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
511	}
512	#endif
513	if (ip->ip_off & IP_OFFMASK)
514	goto end_error; /* Only reply to fragment 0 */
515
516	shlen = ip->ip_hl << 2;
517	s_ip_len = ip->ip_len;
518	if (ip->ip_p == IPPROTO_ICMP)
519	{
520	icp = (struct icmp )((char )ip + shlen);
521	/*
522	* Assume any unknown ICMP type is an error. This isn't
523	* specified by the RFC, but think about it..
524	*/
525	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
526	goto end_error;
527	}
528
529	/* make a copy */
530	if (!(m = m_get(pData)))
531	goto end_error; /* get mbuf */
532	{
533	int new_m_size;
534	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
535	if (new_m_size>m->m_size)
536	m_inc(m, new_m_size);
537	}
538	memcpy(m->m_data, msrc->m_data, msrc->m_len);
539	m->m_len = msrc->m_len; /* copy msrc to m */
540
541	/* make the header of the reply packet */
542	ip = mtod(m, struct ip *);
543	hlen = sizeof(struct ip ); /* no options in reply */
544
545	/* fill in icmp */
546	m->m_data += hlen;
547	m->m_len -= hlen;
548
549	icp = mtod(m, struct icmp *);
550
551	if (minsize)
552	s_ip_len = shlen+ICMP_MINLEN; /* return header+8b only */
553	else if (s_ip_len > ICMP_MAXDATALEN) /* maximum size */
554	s_ip_len = ICMP_MAXDATALEN;
555
556	m->m_len = ICMP_MINLEN + s_ip_len; /* 8 bytes ICMP header */
557
558	/* min. size = 8+sizeof(struct ip)+8 */
559
560	icp->icmp_type = type;
561	icp->icmp_code = code;
562	icp->icmp_id = 0;
563	icp->icmp_seq = 0;
564
565	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
566	HTONS(icp->icmp_ip.ip_len);
567	HTONS(icp->icmp_ip.ip_id);
568	HTONS(icp->icmp_ip.ip_off);
569
570	#if DEBUG
571	if (message)
572	{
573	/* DEBUG : append message to ICMP packet */
574	int message_len;
575	char *cpnt;
576	message_len = strlen(message);
577	if (message_len > ICMP_MAXDATALEN)
578	message_len = ICMP_MAXDATALEN;
579	cpnt = (char *)m->m_data+m->m_len;
580	memcpy(cpnt, message, message_len);
581	m->m_len += message_len;
582	}
583	#endif
584
585	icp->icmp_cksum = 0;
586	icp->icmp_cksum = cksum(m, m->m_len);
587
588	m->m_data -= hlen;
589	m->m_len += hlen;
590
591	/* fill in ip */
592	ip->ip_hl = hlen >> 2;
593	ip->ip_len = m->m_len;
594
595	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
596
597	ip->ip_ttl = MAXTTL;
598	ip->ip_p = IPPROTO_ICMP;
599	ip->ip_dst = ip->ip_src; /* ip adresses */
600	ip->ip_src = alias_addr;
601
602	(void ) ip_output(pData, (struct socket *)NULL, m);
603
604	icmpstat.icps_reflect++;
605
606	end_error:
607	;
608	}
609	#undef ICMP_MAXDATALEN
610
611	/*
612	* Reflect the ip packet back to the source
613	*/
614	void
615	icmp_reflect(PNATState pData, struct mbuf *m)
616	{
617	register struct ip ip = mtod(m, struct ip );
618	int hlen = ip->ip_hl << 2;
619	int optlen = hlen - sizeof(struct ip );
620	register struct icmp *icp;
621
622	/*
623	* Send an icmp packet back to the ip level,
624	* after supplying a checksum.
625	*/
626	m->m_data += hlen;
627	m->m_len -= hlen;
628	icp = mtod(m, struct icmp *);
629
630	icp->icmp_cksum = 0;
631	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
632
633	m->m_data -= hlen;
634	m->m_len += hlen;
635
636	#ifndef VBOX_WITH_SLIRP_ICMP
637	/* fill in ip */
638	if (optlen > 0)
639	{
640	/*
641	* Strip out original options by copying rest of first
642	* mbuf's data back, and adjust the IP length.
643	*/
644	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
645	(unsigned )(m->m_len - hlen));
646	hlen -= optlen;
647	ip->ip_hl = hlen >> 2;
648	ip->ip_len -= optlen;
649	m->m_len -= optlen;
650	}
651	ip->ip_ttl = MAXTTL;
652	{
653	/* swap */
654	struct in_addr icmp_dst;
655	icmp_dst = ip->ip_dst;
656	ip->ip_dst = ip->ip_src;
657	ip->ip_src = icmp_dst;
658	}
659	#endif /* !VBOX_WITH_SLIRP_ICMP */
660
661	(void ) ip_output(pData, (struct socket *)NULL, m);
662
663	icmpstat.icps_reflect++;
664	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15355

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