ip_icmp.c@ 15875

Last change on this file since 15875 was 15791, checked in by vboxsync, 16 years ago
NAT: malloc/free/realloc/strdup => iprt functions; fixed VBOX_WITH_SLIRP_MEMORY_CHECK
Property svn:eol-style set to `native`
File size: 21.3 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	break;
192	}
193	Log(("Have found nothing\n"));
194	}
195	break;
196
197	/*
198	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
199	* from which the IP package has been sent.
200	*/
201	case IPPROTO_UDP:
202	head_socket = &udb;
203	udp = (struct udphdr )((char )ip + (ip->ip_hl << 2));
204	faddr.s_addr = ip->ip_dst.s_addr;
205	fport = udp->uh_dport;
206	laddr.s_addr = ip->ip_src.s_addr;
207	lport = udp->uh_sport;
208	last_socket = udp_last_so;
209	/* fall through */
210
211	case IPPROTO_TCP:
212	if (head_socket == NULL)
213	{
214	tcp = (struct tcphdr )((char )ip + (ip->ip_hl << 2));
215	head_socket = &tcb; /* head_socket could be initialized with udb*/
216	faddr.s_addr = ip->ip_dst.s_addr;
217	fport = tcp->th_dport;
218	laddr.s_addr = ip->ip_src.s_addr;
219	lport = tcp->th_sport;
220	last_socket = tcp_last_so;
221	}
222	/* check last socket first */
223	if ( last_socket->so_faddr.s_addr == faddr.s_addr
224	&& last_socket->so_fport == fport
225	&& last_socket->so_hlport == lport)
226	{
227	found = 1;
228	so = last_socket;
229	goto sofound;
230	}
231	for (so = head_socket->so_prev; so != head_socket; so = so->so_prev)
232	{
233	/* Should be reaplaced by hash here */
234	Log(("trying:%R[natsock] against %R[IP4]:%d lport=%d hlport=%d\n", so, &faddr, fport, lport, so->so_hlport));
235	if ( so->so_faddr.s_addr == faddr.s_addr
236	&& so->so_fport == fport
237	&& so->so_hlport == lport)
238	{
239	found = 1;
240	break;
241	}
242	}
243	break;
244
245	default:
246	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
247	}
248	sofound:
249	if (found == 1 && icm == NULL)
250	{
251	icm = RTMemAlloc(sizeof(struct icmp_msg));
252	icm->im_m = so->so_m;
253	icm->im_so = so;
254	found = 1;
255	Log(("hit:%R[natsock]\n", so));
256	/*XXX: this storage not very long,
257	* better add flag if it should removed from lis
258	*/
259	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
260	return (icm);
261	}
262	if (found == 1)
263	return icm;
264
265	return NULL;
266	}
267
268	static int
269	icmp_attach(PNATState pData, struct mbuf *m)
270	{
271	struct icmp_msg *icm;
272	struct ip *ip;
273	ip = mtod(m, struct ip *);
274	Assert(ip->ip_p == IPPROTO_ICMP);
275	icm = RTMemAlloc(sizeof(struct icmp_msg));
276	icm->im_m = m;
277	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
278	return 0;
279	}
280
281	/*
282	* Process a received ICMP message.
283	*/
284	void
285	icmp_input(PNATState pData, struct mbuf *m, int hlen)
286	{
287	register struct icmp *icp;
288	register struct ip ip = mtod(m, struct ip );
289	int icmplen = ip->ip_len;
290	int status;
291	uint32_t dst;
292	#if !defined(RT_OS_WINDOWS)
293	int ttl;
294	#endif
295
296	/* int code; */
297
298	DEBUG_CALL("icmp_input");
299	DEBUG_ARG("m = %lx", (long )m);
300	DEBUG_ARG("m_len = %d", m->m_len);
301
302	icmpstat.icps_received++;
303
304	/*
305	* Locate icmp structure in mbuf, and check
306	* that its not corrupted and of at least minimum length.
307	*/
308	if (icmplen < ICMP_MINLEN)
309	{
310	/* min 8 bytes payload */
311	icmpstat.icps_tooshort++;
312	freeit:
313	m_freem(pData, m);
314	goto end_error;
315	}
316
317	m->m_len -= hlen;
318	m->m_data += hlen;
319	icp = mtod(m, struct icmp *);
320	if (cksum(m, icmplen))
321	{
322	icmpstat.icps_checksum++;
323	goto freeit;
324	}
325	m->m_len += hlen;
326	m->m_data -= hlen;
327
328	/* icmpstat.icps_inhist[icp->icmp_type]++; */
329	/* code = icp->icmp_code; */
330
331	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
332	switch (icp->icmp_type)
333	{
334	case ICMP_ECHO:
335	ip->ip_len += hlen; /* since ip_input subtracts this */
336	dst = ip->ip_dst.s_addr;
337	if (dst == alias_addr.s_addr)
338	{
339	icp->icmp_type = ICMP_ECHOREPLY;
340	ip->ip_dst.s_addr = ip->ip_src.s_addr;
341	ip->ip_src.s_addr = dst;
342	icmp_reflect(pData, m);
343	}
344	else
345	{
346	struct sockaddr_in addr;
347	#ifdef RT_OS_WINDOWS
348	IP_OPTION_INFORMATION ipopt;
349	int error;
350	#endif
351	addr.sin_family = AF_INET;
352	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
353	{
354	/* It's an alias */
355	switch (ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
356	{
357	case CTL_DNS:
358	addr.sin_addr = dns_addr;
359	break;
360	case CTL_ALIAS:
361	default:
362	addr.sin_addr = loopback_addr;
363	break;
364	}
365	}
366	else
367	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
368	#ifndef RT_OS_WINDOWS
369	if (pData->icmp_socket.s != -1)
370	{
371	icmp_attach(pData, m);
372	ttl = ip->ip_ttl;
373	Log(("NAT/ICMP: try to set TTL(%d)\n", ttl));
374	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL,
375	(void *)&ttl, sizeof(ttl));
376	if (status < 0)
377	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n",
378	strerror(errno)));
379	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
380	(struct sockaddr *)&addr, sizeof(addr)) == -1)
381	{
382	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
383	errno, strerror(errno)));
384	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
385	m_free(pData, m);
386	}
387	}
388	else
389	{
390	/*
391	* We're freeing the ICMP message, which unable sent or process.
392	* That behavior described in rfc 793, we shouldn't notify sender about
393	* fail of processing it's ICMP packets
394	*/
395	m_free(pData, m);
396	return;
397	}
398	#else /* RT_OS_WINDOWS */
399	icmp_attach(pData, m);
400	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
401	pData->icmp_socket.so_icmp_id = icp->icmp_id;
402	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
403	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
404	ipopt.Ttl = ip->ip_ttl;
405	status = ICMP_SEND_ECHO(pData->phEvents[VBOX_ICMP_EVENT_INDEX], notify_slirp, addr.sin_addr.s_addr,
406	icp->icmp_data, icmplen - ICMP_MINLEN, &ipopt);
407	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
408	{
409	error = GetLastError();
410	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
411	switch (error)
412	{
413	case ERROR_INVALID_PARAMETER:
414	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
415	break;
416	case ERROR_NOT_SUPPORTED:
417	LogRel(("operation is unsupported)\n"));
418	break;
419	case ERROR_NOT_ENOUGH_MEMORY:
420	LogRel(("OOM!!!)\n"));
421	break;
422	case IP_BUF_TOO_SMALL:
423	LogRel(("Buffer too small)\n"));
424	break;
425	default:
426	LogRel(("Other error!!!)\n"));
427	break;
428	}
429	}
430	#endif /* RT_OS_WINDOWS */
431	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
432	break;
433	case ICMP_UNREACH:
434	/* XXX? report error? close socket? */
435	case ICMP_TIMXCEED:
436	case ICMP_PARAMPROB:
437	case ICMP_SOURCEQUENCH:
438	case ICMP_TSTAMP:
439	case ICMP_MASKREQ:
440	case ICMP_REDIRECT:
441	icmpstat.icps_notsupp++;
442	m_freem(pData, m);
443	break;
444
445	default:
446	icmpstat.icps_badtype++;
447	m_freem(pData, m);
448	} /* switch */
449
450	end_error:
451	/* m is m_free()'d xor put in a socket xor or given to ip_send */
452	;
453	}
454
455
456	/*
457	* Send an ICMP message in response to a situation
458	*
459	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
460	* MUST NOT change this header information.
461	* MUST NOT reply to a multicast/broadcast IP address.
462	* MUST NOT reply to a multicast/broadcast MAC address.
463	* MUST reply to only the first fragment.
464	*/
465	/*
466	* Send ICMP_UNREACH back to the source regarding msrc.
467	* mbuf *msrc is used as a template, but is NOT m_free()'d.
468	* It is reported as the bad ip packet. The header should
469	* be fully correct and in host byte order.
470	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
471	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
472	*/
473
474	#define ICMP_MAXDATALEN (IP_MSS-28)
475	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, const char message)
476	{
477	unsigned hlen, shlen, s_ip_len;
478	register struct ip *ip;
479	register struct icmp *icp;
480	register struct mbuf *m;
481
482	DEBUG_CALL("icmp_error");
483	DEBUG_ARG("msrc = %lx", (long )msrc);
484	DEBUG_ARG("msrc_len = %d", msrc->m_len);
485
486	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
487	goto end_error;
488
489	/* check msrc */
490	if (!msrc)
491	goto end_error;
492
493	ip = mtod(msrc, struct ip *);
494	#if DEBUG
495	{
496	char bufa[20], bufb[20];
497	strcpy(bufa, inet_ntoa(ip->ip_src));
498	strcpy(bufb, inet_ntoa(ip->ip_dst));
499	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
500	}
501	#endif
502	if (ip->ip_off & IP_OFFMASK)
503	goto end_error; /* Only reply to fragment 0 */
504
505	shlen = ip->ip_hl << 2;
506	s_ip_len = ip->ip_len;
507	if (ip->ip_p == IPPROTO_ICMP)
508	{
509	icp = (struct icmp )((char )ip + shlen);
510	/*
511	* Assume any unknown ICMP type is an error. This isn't
512	* specified by the RFC, but think about it..
513	*/
514	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
515	goto end_error;
516	}
517
518	/* make a copy */
519	if (!(m = m_get(pData)))
520	goto end_error; /* get mbuf */
521	{
522	int new_m_size;
523	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
524	if (new_m_size>m->m_size)
525	m_inc(m, new_m_size);
526	}
527	memcpy(m->m_data, msrc->m_data, msrc->m_len);
528	m->m_len = msrc->m_len; /* copy msrc to m */
529
530	/* make the header of the reply packet */
531	ip = mtod(m, struct ip *);
532	hlen = sizeof(struct ip ); /* no options in reply */
533
534	/* fill in icmp */
535	m->m_data += hlen;
536	m->m_len -= hlen;
537
538	icp = mtod(m, struct icmp *);
539
540	if (minsize)
541	s_ip_len = shlen+ICMP_MINLEN; /* return header+8b only */
542	else if (s_ip_len > ICMP_MAXDATALEN) /* maximum size */
543	s_ip_len = ICMP_MAXDATALEN;
544
545	m->m_len = ICMP_MINLEN + s_ip_len; /* 8 bytes ICMP header */
546
547	/* min. size = 8+sizeof(struct ip)+8 */
548
549	icp->icmp_type = type;
550	icp->icmp_code = code;
551	icp->icmp_id = 0;
552	icp->icmp_seq = 0;
553
554	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
555	HTONS(icp->icmp_ip.ip_len);
556	HTONS(icp->icmp_ip.ip_id);
557	HTONS(icp->icmp_ip.ip_off);
558
559	#if DEBUG
560	if (message)
561	{
562	/* DEBUG : append message to ICMP packet */
563	int message_len;
564	char *cpnt;
565	message_len = strlen(message);
566	if (message_len > ICMP_MAXDATALEN)
567	message_len = ICMP_MAXDATALEN;
568	cpnt = (char *)m->m_data+m->m_len;
569	memcpy(cpnt, message, message_len);
570	m->m_len += message_len;
571	}
572	#endif
573
574	icp->icmp_cksum = 0;
575	icp->icmp_cksum = cksum(m, m->m_len);
576
577	m->m_data -= hlen;
578	m->m_len += hlen;
579
580	/* fill in ip */
581	ip->ip_hl = hlen >> 2;
582	ip->ip_len = m->m_len;
583
584	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
585
586	ip->ip_ttl = MAXTTL;
587	ip->ip_p = IPPROTO_ICMP;
588	ip->ip_dst = ip->ip_src; /* ip adresses */
589	ip->ip_src = alias_addr;
590
591	(void ) ip_output(pData, (struct socket *)NULL, m);
592
593	icmpstat.icps_reflect++;
594
595	end_error:
596	;
597	}
598	#undef ICMP_MAXDATALEN
599
600	/*
601	* Reflect the ip packet back to the source
602	*/
603	void
604	icmp_reflect(PNATState pData, struct mbuf *m)
605	{
606	register struct ip ip = mtod(m, struct ip );
607	int hlen = ip->ip_hl << 2;
608	int optlen = hlen - sizeof(struct ip );
609	register struct icmp *icp;
610
611	/*
612	* Send an icmp packet back to the ip level,
613	* after supplying a checksum.
614	*/
615	m->m_data += hlen;
616	m->m_len -= hlen;
617	icp = mtod(m, struct icmp *);
618
619	icp->icmp_cksum = 0;
620	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
621
622	m->m_data -= hlen;
623	m->m_len += hlen;
624
625	(void ) ip_output(pData, (struct socket *)NULL, m);
626
627	icmpstat.icps_reflect++;
628	}
629	#if defined(RT_OS_WINDOWS) && !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
630	static void WINAPI
631	notify_slirp(void *ctx)
632	{
633	/* pData name is important see slirp_state.h */
634	PNATState pData = (PNATState)ctx;
635	fIcmp = 1;
636	}
637	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15875

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