ip_icmp.c@ 16531

Last change on this file since 16531 was 16293, checked in by vboxsync, 16 years ago
NAT:ICMP: fixed the crash in case of communication via ICMP socket.
Property svn:eol-style set to `native`
File size: 21.6 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	#ifdef RT_OS_WINDOWS
45	# ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
46	# define ICMP_SEND_ECHO(event, routine, addr, data, datasize, ipopt) \
47	IcmpSendEcho2(pData->icmp_socket.sh, (event), NULL, NULL, (addr), (data), (datasize), \
48	(ipopt), pData->pvIcmpBuffer, pData->szIcmpBuffer, 1)
49	# else /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
50	# define ICMP_SEND_ECHO(event, routine, addr, data, datasize, ipopt) \
51	IcmpSendEcho2(pData->icmp_socket.sh, NULL, (FARPROC)(routine), (void *)pData, (addr), (data), (datasize), \
52	(ipopt), pData->pvIcmpBuffer, pData->szIcmpBuffer, 1)
53	static void WINAPI notify_slirp(void *);
54	# endif /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
55	#endif /* RT_OS_WINDOWS */
56
57	/* The message sent when emulating PING */
58	/* Be nice and tell them it's just a psuedo-ping packet */
59	static const char icmp_ping_msg[] = "This is a psuedo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
60
61	/* list of actions for icmp_error() on RX of an icmp message */
62	static const int icmp_flush[19] =
63	{
64	/* ECHO REPLY (0) */ 0,
65	1,
66	1,
67	/* DEST UNREACH (3) */ 1,
68	/* SOURCE QUENCH (4)*/ 1,
69	/* REDIRECT (5) */ 1,
70	1,
71	1,
72	/* ECHO (8) */ 0,
73	/* ROUTERADVERT (9) */ 1,
74	/* ROUTERSOLICIT (10) */ 1,
75	/* TIME EXCEEDED (11) */ 1,
76	/* PARAMETER PROBLEM (12) */ 1,
77	/* TIMESTAMP (13) */ 0,
78	/* TIMESTAMP REPLY (14) */ 0,
79	/* INFO (15) */ 0,
80	/* INFO REPLY (16) */ 0,
81	/* ADDR MASK (17) */ 0,
82	/* ADDR MASK REPLY (18) */ 0
83	};
84
85	int
86	icmp_init(PNATState pData)
87	{
88	pData->icmp_socket.so_type = IPPROTO_ICMP;
89	pData->icmp_socket.so_state = SS_ISFCONNECTED;
90	#ifndef RT_OS_WINDOWS
91	# ifndef RT_OS_DARWIN
92	pData->icmp_socket.s = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
93	# else /* !RT_OS_DARWIN */
94	pData->icmp_socket.s = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
95	# endif /* RT_OS_DARWIN */
96	if (pData->icmp_socket.s == -1)
97	{
98	int rc = RTErrConvertFromErrno(errno);
99	LogRel(("NAT: ICMP/ping not available (could open ICMP socket, error %Rrc)\n", rc));
100	return 1;
101	}
102	#else /* RT_OS_WINDOWS */
103	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
104	if (pData->hmIcmpLibrary != NULL)
105	{
106	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
107	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
108	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
109	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
110	}
111	if (pData->pfIcmpParseReplies == NULL)
112	{
113	FreeLibrary(pData->hmIcmpLibrary);
114	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
115	if (pData->hmIcmpLibrary == NULL)
116	{
117	LogRel(("NAT: Icmp.dll could not be loaded\n"));
118	return 1;
119	}
120	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
121	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
122	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
123	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
124	}
125	if (pData->pfIcmpParseReplies == NULL)
126	{
127	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
128	FreeLibrary(pData->hmIcmpLibrary);
129	return 1;
130	}
131	if (pData->pfIcmpCloseHandle == NULL)
132	{
133	LogRel(("NAT: Can't find IcmpCloseHandle symbol\n"));
134	FreeLibrary(pData->hmIcmpLibrary);
135	return 1;
136	}
137	pData->icmp_socket.sh = IcmpCreateFile();
138	# ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
139	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
140	# endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
141	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
142	pData->pvIcmpBuffer = RTMemAlloc(pData->szIcmpBuffer);
143	#endif /* RT_OS_WINDOWS */
144	LIST_INIT(&pData->icmp_msg_head);
145	return 0;
146	}
147
148	/*
149	* ip here is ip header + 64bytes readed from ICMP packet
150	*/
151	struct icmp_msg *
152	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
153	{
154	struct mbuf *m0;
155	struct ip *ip0;
156	struct icmp icp, icp0;
157	struct icmp_msg *icm = NULL;
158	int found = 0;
159	struct udphdr *udp;
160	struct tcphdr *tcp;
161	struct socket *head_socket = NULL;
162	struct socket *last_socket = NULL;
163	struct socket *so = NULL;
164	struct in_addr laddr, faddr;
165	u_short lport, fport;
166
167	laddr.s_addr = ~0;
168	faddr.s_addr = ~0;
169
170	lport = ~0;
171	fport = ~0;
172
173
174	Log(("%s: processing (proto:%d)\n", __FUNCTION__, ip->ip_p));
175	switch (ip->ip_p)
176	{
177	case IPPROTO_ICMP:
178	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
179	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
180	{
181	m0 = icm->im_m;
182	ip0 = mtod(m0, struct ip *);
183	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
184	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
185	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
186	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
187	&& icp->icmp_id == icp0->icmp_id
188	&& icp->icmp_seq == icp0->icmp_seq)
189	{
190	found = 1;
191	Log(("Have found %R[natsock]\n", icm->im_so));
192	break;
193	}
194	Log(("Have found nothing\n"));
195	}
196	break;
197
198	/*
199	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
200	* from which the IP package has been sent.
201	*/
202	case IPPROTO_UDP:
203	head_socket = &udb;
204	udp = (struct udphdr )((char )ip + (ip->ip_hl << 2));
205	faddr.s_addr = ip->ip_dst.s_addr;
206	fport = udp->uh_dport;
207	laddr.s_addr = ip->ip_src.s_addr;
208	lport = udp->uh_sport;
209	last_socket = udp_last_so;
210	/* fall through */
211
212	case IPPROTO_TCP:
213	if (head_socket == NULL)
214	{
215	tcp = (struct tcphdr )((char )ip + (ip->ip_hl << 2));
216	head_socket = &tcb; /* head_socket could be initialized with udb*/
217	faddr.s_addr = ip->ip_dst.s_addr;
218	fport = tcp->th_dport;
219	laddr.s_addr = ip->ip_src.s_addr;
220	lport = tcp->th_sport;
221	last_socket = tcp_last_so;
222	}
223	/* check last socket first */
224	if ( last_socket->so_faddr.s_addr == faddr.s_addr
225	&& last_socket->so_fport == fport
226	&& last_socket->so_hlport == lport)
227	{
228	found = 1;
229	so = last_socket;
230	goto sofound;
231	}
232	for (so = head_socket->so_prev; so != head_socket; so = so->so_prev)
233	{
234	/* Should be reaplaced by hash here */
235	Log(("trying:%R[natsock] against %R[IP4]:%d lport=%d hlport=%d\n", so, &faddr, fport, lport, so->so_hlport));
236	if ( so->so_faddr.s_addr == faddr.s_addr
237	&& so->so_fport == fport
238	&& so->so_hlport == lport)
239	{
240	found = 1;
241	break;
242	}
243	}
244	break;
245
246	default:
247	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
248	}
249	sofound:
250	if (found == 1 && icm == NULL)
251	{
252	icm = RTMemAlloc(sizeof(struct icmp_msg));
253	icm->im_m = so->so_m;
254	icm->im_so = so;
255	found = 1;
256	Log(("hit:%R[natsock]\n", so));
257	/*XXX: this storage not very long,
258	* better add flag if it should removed from lis
259	*/
260	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
261	return (icm);
262	}
263	if (found == 1)
264	return icm;
265
266	return NULL;
267	}
268
269	static int
270	icmp_attach(PNATState pData, struct mbuf *m)
271	{
272	struct icmp_msg *icm;
273	struct ip *ip;
274	ip = mtod(m, struct ip *);
275	Assert(ip->ip_p == IPPROTO_ICMP);
276	icm = RTMemAlloc(sizeof(struct icmp_msg));
277	icm->im_m = m;
278	icm->im_so = m->m_so;
279	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
280	return 0;
281	}
282
283	/*
284	* Process a received ICMP message.
285	*/
286	void
287	icmp_input(PNATState pData, struct mbuf *m, int hlen)
288	{
289	register struct icmp *icp;
290	register struct ip ip = mtod(m, struct ip );
291	int icmplen = ip->ip_len;
292	int status;
293	uint32_t dst;
294	#if !defined(RT_OS_WINDOWS)
295	int ttl;
296	#endif
297
298	/* int code; */
299
300	DEBUG_CALL("icmp_input");
301	DEBUG_ARG("m = %lx", (long )m);
302	DEBUG_ARG("m_len = %d", m->m_len);
303
304	icmpstat.icps_received++;
305
306	/*
307	* Locate icmp structure in mbuf, and check
308	* that its not corrupted and of at least minimum length.
309	*/
310	if (icmplen < ICMP_MINLEN)
311	{
312	/* min 8 bytes payload */
313	icmpstat.icps_tooshort++;
314	freeit:
315	m_freem(pData, m);
316	goto end_error;
317	}
318
319	m->m_len -= hlen;
320	m->m_data += hlen;
321	icp = mtod(m, struct icmp *);
322	if (cksum(m, icmplen))
323	{
324	icmpstat.icps_checksum++;
325	goto freeit;
326	}
327	m->m_len += hlen;
328	m->m_data -= hlen;
329
330	/* icmpstat.icps_inhist[icp->icmp_type]++; */
331	/* code = icp->icmp_code; */
332
333	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
334	switch (icp->icmp_type)
335	{
336	case ICMP_ECHO:
337	ip->ip_len += hlen; /* since ip_input subtracts this */
338	dst = ip->ip_dst.s_addr;
339	if (dst == alias_addr.s_addr)
340	{
341	icp->icmp_type = ICMP_ECHOREPLY;
342	ip->ip_dst.s_addr = ip->ip_src.s_addr;
343	ip->ip_src.s_addr = dst;
344	icmp_reflect(pData, m);
345	}
346	else
347	{
348	struct sockaddr_in addr;
349	#ifdef RT_OS_WINDOWS
350	IP_OPTION_INFORMATION ipopt;
351	int error;
352	#endif
353	addr.sin_family = AF_INET;
354	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
355	{
356	/* It's an alias */
357	switch (ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
358	{
359	case CTL_DNS:
360	#ifndef VBOX_WITH_MULTI_DNS
361	addr.sin_addr = dns_addr;
362	break;
363	#endif
364	case CTL_ALIAS:
365	default:
366	addr.sin_addr = loopback_addr;
367	break;
368	}
369	}
370	else
371	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
372	#ifndef RT_OS_WINDOWS
373	if (pData->icmp_socket.s != -1)
374	{
375	m->m_so = &pData->icmp_socket;
376	icmp_attach(pData, m);
377	ttl = ip->ip_ttl;
378	Log(("NAT/ICMP: try to set TTL(%d)\n", ttl));
379	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL,
380	(void *)&ttl, sizeof(ttl));
381	if (status < 0)
382	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n",
383	strerror(errno)));
384	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
385	(struct sockaddr *)&addr, sizeof(addr)) == -1)
386	{
387	Log((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
388	errno, strerror(errno)));
389	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
390	m_free(pData, m);
391	}
392	}
393	else
394	{
395	/*
396	* We're freeing the ICMP message, which unable sent or process.
397	* That behavior described in rfc 793, we shouldn't notify sender about
398	* fail of processing it's ICMP packets
399	*/
400	m_free(pData, m);
401	return;
402	}
403	#else /* RT_OS_WINDOWS */
404	icmp_attach(pData, m);
405	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
406	pData->icmp_socket.so_icmp_id = icp->icmp_id;
407	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
408	m->m_so = &pData->icmp_socket;
409	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
410	ipopt.Ttl = ip->ip_ttl;
411	status = ICMP_SEND_ECHO(pData->phEvents[VBOX_ICMP_EVENT_INDEX], notify_slirp, addr.sin_addr.s_addr,
412	icp->icmp_data, icmplen - ICMP_MINLEN, &ipopt);
413	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
414	{
415	error = GetLastError();
416	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
417	switch (error)
418	{
419	case ERROR_INVALID_PARAMETER:
420	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
421	break;
422	case ERROR_NOT_SUPPORTED:
423	LogRel(("operation is unsupported)\n"));
424	break;
425	case ERROR_NOT_ENOUGH_MEMORY:
426	LogRel(("OOM!!!)\n"));
427	break;
428	case IP_BUF_TOO_SMALL:
429	LogRel(("Buffer too small)\n"));
430	break;
431	default:
432	LogRel(("Other error!!!)\n"));
433	break;
434	}
435	}
436	#endif /* RT_OS_WINDOWS */
437	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
438	break;
439	case ICMP_UNREACH:
440	/* XXX? report error? close socket? */
441	case ICMP_TIMXCEED:
442	case ICMP_PARAMPROB:
443	case ICMP_SOURCEQUENCH:
444	case ICMP_TSTAMP:
445	case ICMP_MASKREQ:
446	case ICMP_REDIRECT:
447	icmpstat.icps_notsupp++;
448	m_freem(pData, m);
449	break;
450
451	default:
452	icmpstat.icps_badtype++;
453	m_freem(pData, m);
454	} /* switch */
455
456	end_error:
457	/* m is m_free()'d xor put in a socket xor or given to ip_send */
458	;
459	}
460
461
462	/*
463	* Send an ICMP message in response to a situation
464	*
465	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
466	* MUST NOT change this header information.
467	* MUST NOT reply to a multicast/broadcast IP address.
468	* MUST NOT reply to a multicast/broadcast MAC address.
469	* MUST reply to only the first fragment.
470	*/
471	/*
472	* Send ICMP_UNREACH back to the source regarding msrc.
473	* mbuf *msrc is used as a template, but is NOT m_free()'d.
474	* It is reported as the bad ip packet. The header should
475	* be fully correct and in host byte order.
476	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
477	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
478	*/
479
480	#define ICMP_MAXDATALEN (IP_MSS-28)
481	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, const char message)
482	{
483	unsigned hlen, shlen, s_ip_len;
484	register struct ip *ip;
485	register struct icmp *icp;
486	register struct mbuf *m;
487
488	DEBUG_CALL("icmp_error");
489	DEBUG_ARG("msrc = %lx", (long )msrc);
490	DEBUG_ARG("msrc_len = %d", msrc->m_len);
491
492	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
493	goto end_error;
494
495	/* check msrc */
496	if (!msrc)
497	goto end_error;
498
499	ip = mtod(msrc, struct ip *);
500	#if DEBUG
501	{
502	char bufa[20], bufb[20];
503	strcpy(bufa, inet_ntoa(ip->ip_src));
504	strcpy(bufb, inet_ntoa(ip->ip_dst));
505	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
506	}
507	#endif
508	if (ip->ip_off & IP_OFFMASK)
509	goto end_error; /* Only reply to fragment 0 */
510
511	shlen = ip->ip_hl << 2;
512	s_ip_len = ip->ip_len;
513	if (ip->ip_p == IPPROTO_ICMP)
514	{
515	icp = (struct icmp )((char )ip + shlen);
516	/*
517	* Assume any unknown ICMP type is an error. This isn't
518	* specified by the RFC, but think about it..
519	*/
520	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
521	goto end_error;
522	}
523
524	/* make a copy */
525	if (!(m = m_get(pData)))
526	goto end_error; /* get mbuf */
527	{
528	int new_m_size;
529	m->m_data += if_maxlinkhdr;
530	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
531	if (new_m_size>m->m_size)
532	m_inc(m, new_m_size);
533	}
534	memcpy(m->m_data, msrc->m_data, msrc->m_len);
535	m->m_len = msrc->m_len; /* copy msrc to m */
536
537	/* make the header of the reply packet */
538	ip = mtod(m, struct ip *);
539	hlen = sizeof(struct ip ); /* no options in reply */
540
541	/* fill in icmp */
542	m->m_data += hlen;
543	m->m_len -= hlen;
544
545	icp = mtod(m, struct icmp *);
546
547	if (minsize)
548	s_ip_len = shlen+ICMP_MINLEN; /* return header+8b only */
549	else if (s_ip_len > ICMP_MAXDATALEN) /* maximum size */
550	s_ip_len = ICMP_MAXDATALEN;
551
552	m->m_len = ICMP_MINLEN + s_ip_len; /* 8 bytes ICMP header */
553
554	/* min. size = 8+sizeof(struct ip)+8 */
555
556	icp->icmp_type = type;
557	icp->icmp_code = code;
558	icp->icmp_id = 0;
559	icp->icmp_seq = 0;
560
561	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
562	HTONS(icp->icmp_ip.ip_len);
563	HTONS(icp->icmp_ip.ip_id);
564	HTONS(icp->icmp_ip.ip_off);
565
566	#if DEBUG
567	if (message)
568	{
569	/* DEBUG : append message to ICMP packet */
570	int message_len;
571	char *cpnt;
572	message_len = strlen(message);
573	if (message_len > ICMP_MAXDATALEN)
574	message_len = ICMP_MAXDATALEN;
575	cpnt = (char *)m->m_data+m->m_len;
576	memcpy(cpnt, message, message_len);
577	m->m_len += message_len;
578	}
579	#endif
580
581	icp->icmp_cksum = 0;
582	icp->icmp_cksum = cksum(m, m->m_len);
583
584	m->m_data -= hlen;
585	m->m_len += hlen;
586
587	/* fill in ip */
588	ip->ip_hl = hlen >> 2;
589	ip->ip_len = m->m_len;
590
591	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
592
593	ip->ip_ttl = MAXTTL;
594	ip->ip_p = IPPROTO_ICMP;
595	ip->ip_dst = ip->ip_src; /* ip adresses */
596	ip->ip_src = alias_addr;
597
598	(void ) ip_output(pData, (struct socket *)NULL, m);
599
600	icmpstat.icps_reflect++;
601
602	end_error:
603	;
604	}
605	#undef ICMP_MAXDATALEN
606
607	/*
608	* Reflect the ip packet back to the source
609	*/
610	void
611	icmp_reflect(PNATState pData, struct mbuf *m)
612	{
613	register struct ip ip = mtod(m, struct ip );
614	int hlen = ip->ip_hl << 2;
615	int optlen = hlen - sizeof(struct ip );
616	register struct icmp *icp;
617
618	/*
619	* Send an icmp packet back to the ip level,
620	* after supplying a checksum.
621	*/
622	m->m_data += hlen;
623	m->m_len -= hlen;
624	icp = mtod(m, struct icmp *);
625
626	icp->icmp_cksum = 0;
627	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
628
629	m->m_data -= hlen;
630	m->m_len += hlen;
631
632	(void ) ip_output(pData, (struct socket *)NULL, m);
633
634	icmpstat.icps_reflect++;
635	}
636	#if defined(RT_OS_WINDOWS) && !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
637	static void WINAPI
638	notify_slirp(void *ctx)
639	{
640	/* pData name is important see slirp_state.h */
641	PNATState pData = (PNATState)ctx;
642	fIcmp = 1;
643	}
644	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 16531

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