ip_icmp.c@ 16614

Last change on this file since 16614 was 16614, checked in by vboxsync, 16 years ago
NAT:ICMP socket non-blocking
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	fd_nonblock(pData->icmp_socket.s);
103	#else /* RT_OS_WINDOWS */
104	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
105	if (pData->hmIcmpLibrary != NULL)
106	{
107	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
108	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
109	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
110	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
111	}
112	if (pData->pfIcmpParseReplies == NULL)
113	{
114	FreeLibrary(pData->hmIcmpLibrary);
115	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
116	if (pData->hmIcmpLibrary == NULL)
117	{
118	LogRel(("NAT: Icmp.dll could not be loaded\n"));
119	return 1;
120	}
121	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
122	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
123	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
124	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
125	}
126	if (pData->pfIcmpParseReplies == NULL)
127	{
128	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
129	FreeLibrary(pData->hmIcmpLibrary);
130	return 1;
131	}
132	if (pData->pfIcmpCloseHandle == NULL)
133	{
134	LogRel(("NAT: Can't find IcmpCloseHandle symbol\n"));
135	FreeLibrary(pData->hmIcmpLibrary);
136	return 1;
137	}
138	pData->icmp_socket.sh = IcmpCreateFile();
139	# ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
140	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
141	# endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
142	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
143	pData->pvIcmpBuffer = RTMemAlloc(pData->szIcmpBuffer);
144	#endif /* RT_OS_WINDOWS */
145	LIST_INIT(&pData->icmp_msg_head);
146	return 0;
147	}
148
149	/*
150	* ip here is ip header + 64bytes readed from ICMP packet
151	*/
152	struct icmp_msg *
153	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
154	{
155	struct mbuf *m0;
156	struct ip *ip0;
157	struct icmp icp, icp0;
158	struct icmp_msg *icm = NULL;
159	int found = 0;
160	struct udphdr *udp;
161	struct tcphdr *tcp;
162	struct socket *head_socket = NULL;
163	struct socket *last_socket = NULL;
164	struct socket *so = NULL;
165	struct in_addr laddr, faddr;
166	u_short lport, fport;
167
168	laddr.s_addr = ~0;
169	faddr.s_addr = ~0;
170
171	lport = ~0;
172	fport = ~0;
173
174
175	Log(("%s: processing (proto:%d)\n", __FUNCTION__, ip->ip_p));
176	switch (ip->ip_p)
177	{
178	case IPPROTO_ICMP:
179	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
180	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
181	{
182	m0 = icm->im_m;
183	ip0 = mtod(m0, struct ip *);
184	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
185	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
186	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
187	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
188	&& icp->icmp_id == icp0->icmp_id
189	&& icp->icmp_seq == icp0->icmp_seq)
190	{
191	found = 1;
192	Log(("Have found %R[natsock]\n", icm->im_so));
193	break;
194	}
195	Log(("Have found nothing\n"));
196	}
197	break;
198
199	/*
200	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
201	* from which the IP package has been sent.
202	*/
203	case IPPROTO_UDP:
204	head_socket = &udb;
205	udp = (struct udphdr )((char )ip + (ip->ip_hl << 2));
206	faddr.s_addr = ip->ip_dst.s_addr;
207	fport = udp->uh_dport;
208	laddr.s_addr = ip->ip_src.s_addr;
209	lport = udp->uh_sport;
210	last_socket = udp_last_so;
211	/* fall through */
212
213	case IPPROTO_TCP:
214	if (head_socket == NULL)
215	{
216	tcp = (struct tcphdr )((char )ip + (ip->ip_hl << 2));
217	head_socket = &tcb; /* head_socket could be initialized with udb*/
218	faddr.s_addr = ip->ip_dst.s_addr;
219	fport = tcp->th_dport;
220	laddr.s_addr = ip->ip_src.s_addr;
221	lport = tcp->th_sport;
222	last_socket = tcp_last_so;
223	}
224	/* check last socket first */
225	if ( last_socket->so_faddr.s_addr == faddr.s_addr
226	&& last_socket->so_fport == fport
227	&& last_socket->so_hlport == lport)
228	{
229	found = 1;
230	so = last_socket;
231	goto sofound;
232	}
233	for (so = head_socket->so_prev; so != head_socket; so = so->so_prev)
234	{
235	/* Should be reaplaced by hash here */
236	Log(("trying:%R[natsock] against %R[IP4]:%d lport=%d hlport=%d\n", so, &faddr, fport, lport, so->so_hlport));
237	if ( so->so_faddr.s_addr == faddr.s_addr
238	&& so->so_fport == fport
239	&& so->so_hlport == lport)
240	{
241	found = 1;
242	break;
243	}
244	}
245	break;
246
247	default:
248	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
249	}
250	sofound:
251	if (found == 1 && icm == NULL)
252	{
253	icm = RTMemAlloc(sizeof(struct icmp_msg));
254	icm->im_m = so->so_m;
255	icm->im_so = so;
256	found = 1;
257	Log(("hit:%R[natsock]\n", so));
258	/*XXX: this storage not very long,
259	* better add flag if it should removed from lis
260	*/
261	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
262	return (icm);
263	}
264	if (found == 1)
265	return icm;
266
267	return NULL;
268	}
269
270	static int
271	icmp_attach(PNATState pData, struct mbuf *m)
272	{
273	struct icmp_msg *icm;
274	struct ip *ip;
275	ip = mtod(m, struct ip *);
276	Assert(ip->ip_p == IPPROTO_ICMP);
277	icm = RTMemAlloc(sizeof(struct icmp_msg));
278	icm->im_m = m;
279	icm->im_so = m->m_so;
280	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
281	return 0;
282	}
283
284	/*
285	* Process a received ICMP message.
286	*/
287	void
288	icmp_input(PNATState pData, struct mbuf *m, int hlen)
289	{
290	register struct icmp *icp;
291	register struct ip ip = mtod(m, struct ip );
292	int icmplen = ip->ip_len;
293	int status;
294	uint32_t dst;
295	#if !defined(RT_OS_WINDOWS)
296	int ttl;
297	#endif
298
299	/* int code; */
300
301	DEBUG_CALL("icmp_input");
302	DEBUG_ARG("m = %lx", (long )m);
303	DEBUG_ARG("m_len = %d", m->m_len);
304
305	icmpstat.icps_received++;
306
307	/*
308	* Locate icmp structure in mbuf, and check
309	* that its not corrupted and of at least minimum length.
310	*/
311	if (icmplen < ICMP_MINLEN)
312	{
313	/* min 8 bytes payload */
314	icmpstat.icps_tooshort++;
315	freeit:
316	m_freem(pData, m);
317	goto end_error;
318	}
319
320	m->m_len -= hlen;
321	m->m_data += hlen;
322	icp = mtod(m, struct icmp *);
323	if (cksum(m, icmplen))
324	{
325	icmpstat.icps_checksum++;
326	goto freeit;
327	}
328	m->m_len += hlen;
329	m->m_data -= hlen;
330
331	/* icmpstat.icps_inhist[icp->icmp_type]++; */
332	/* code = icp->icmp_code; */
333
334	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
335	switch (icp->icmp_type)
336	{
337	case ICMP_ECHO:
338	ip->ip_len += hlen; /* since ip_input subtracts this */
339	dst = ip->ip_dst.s_addr;
340	if (dst == alias_addr.s_addr)
341	{
342	icp->icmp_type = ICMP_ECHOREPLY;
343	ip->ip_dst.s_addr = ip->ip_src.s_addr;
344	ip->ip_src.s_addr = dst;
345	icmp_reflect(pData, m);
346	}
347	else
348	{
349	struct sockaddr_in addr;
350	#ifdef RT_OS_WINDOWS
351	IP_OPTION_INFORMATION ipopt;
352	int error;
353	#endif
354	addr.sin_family = AF_INET;
355	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
356	{
357	/* It's an alias */
358	switch (ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
359	{
360	case CTL_DNS:
361	#ifndef VBOX_WITH_MULTI_DNS
362	addr.sin_addr = dns_addr;
363	break;
364	#endif
365	case CTL_ALIAS:
366	default:
367	addr.sin_addr = loopback_addr;
368	break;
369	}
370	}
371	else
372	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
373	#ifndef RT_OS_WINDOWS
374	if (pData->icmp_socket.s != -1)
375	{
376	m->m_so = &pData->icmp_socket;
377	icmp_attach(pData, m);
378	ttl = ip->ip_ttl;
379	Log(("NAT/ICMP: try to set TTL(%d)\n", ttl));
380	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL,
381	(void *)&ttl, sizeof(ttl));
382	if (status < 0)
383	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n",
384	strerror(errno)));
385	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
386	(struct sockaddr *)&addr, sizeof(addr)) == -1)
387	{
388	Log((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
389	errno, strerror(errno)));
390	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
391	m_free(pData, m);
392	}
393	}
394	else
395	{
396	/*
397	* We're freeing the ICMP message, which unable sent or process.
398	* That behavior described in rfc 793, we shouldn't notify sender about
399	* fail of processing it's ICMP packets
400	*/
401	m_free(pData, m);
402	return;
403	}
404	#else /* RT_OS_WINDOWS */
405	icmp_attach(pData, m);
406	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
407	pData->icmp_socket.so_icmp_id = icp->icmp_id;
408	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
409	m->m_so = &pData->icmp_socket;
410	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
411	ipopt.Ttl = ip->ip_ttl;
412	status = ICMP_SEND_ECHO(pData->phEvents[VBOX_ICMP_EVENT_INDEX], notify_slirp, addr.sin_addr.s_addr,
413	icp->icmp_data, icmplen - ICMP_MINLEN, &ipopt);
414	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
415	{
416	error = GetLastError();
417	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
418	switch (error)
419	{
420	case ERROR_INVALID_PARAMETER:
421	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
422	break;
423	case ERROR_NOT_SUPPORTED:
424	LogRel(("operation is unsupported)\n"));
425	break;
426	case ERROR_NOT_ENOUGH_MEMORY:
427	LogRel(("OOM!!!)\n"));
428	break;
429	case IP_BUF_TOO_SMALL:
430	LogRel(("Buffer too small)\n"));
431	break;
432	default:
433	LogRel(("Other error!!!)\n"));
434	break;
435	}
436	}
437	#endif /* RT_OS_WINDOWS */
438	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
439	break;
440	case ICMP_UNREACH:
441	/* XXX? report error? close socket? */
442	case ICMP_TIMXCEED:
443	case ICMP_PARAMPROB:
444	case ICMP_SOURCEQUENCH:
445	case ICMP_TSTAMP:
446	case ICMP_MASKREQ:
447	case ICMP_REDIRECT:
448	icmpstat.icps_notsupp++;
449	m_freem(pData, m);
450	break;
451
452	default:
453	icmpstat.icps_badtype++;
454	m_freem(pData, m);
455	} /* switch */
456
457	end_error:
458	/* m is m_free()'d xor put in a socket xor or given to ip_send */
459	;
460	}
461
462
463	/*
464	* Send an ICMP message in response to a situation
465	*
466	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
467	* MUST NOT change this header information.
468	* MUST NOT reply to a multicast/broadcast IP address.
469	* MUST NOT reply to a multicast/broadcast MAC address.
470	* MUST reply to only the first fragment.
471	*/
472	/*
473	* Send ICMP_UNREACH back to the source regarding msrc.
474	* mbuf *msrc is used as a template, but is NOT m_free()'d.
475	* It is reported as the bad ip packet. The header should
476	* be fully correct and in host byte order.
477	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
478	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
479	*/
480
481	#define ICMP_MAXDATALEN (IP_MSS-28)
482	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, const char message)
483	{
484	unsigned hlen, shlen, s_ip_len;
485	register struct ip *ip;
486	register struct icmp *icp;
487	register struct mbuf *m;
488
489	DEBUG_CALL("icmp_error");
490	DEBUG_ARG("msrc = %lx", (long )msrc);
491	DEBUG_ARG("msrc_len = %d", msrc->m_len);
492
493	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
494	goto end_error;
495
496	/* check msrc */
497	if (!msrc)
498	goto end_error;
499
500	ip = mtod(msrc, struct ip *);
501	#if DEBUG
502	{
503	char bufa[20], bufb[20];
504	strcpy(bufa, inet_ntoa(ip->ip_src));
505	strcpy(bufb, inet_ntoa(ip->ip_dst));
506	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
507	}
508	#endif
509	if (ip->ip_off & IP_OFFMASK)
510	goto end_error; /* Only reply to fragment 0 */
511
512	shlen = ip->ip_hl << 2;
513	s_ip_len = ip->ip_len;
514	if (ip->ip_p == IPPROTO_ICMP)
515	{
516	icp = (struct icmp )((char )ip + shlen);
517	/*
518	* Assume any unknown ICMP type is an error. This isn't
519	* specified by the RFC, but think about it..
520	*/
521	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
522	goto end_error;
523	}
524
525	/* make a copy */
526	if (!(m = m_get(pData)))
527	goto end_error; /* get mbuf */
528	{
529	int new_m_size;
530	m->m_data += if_maxlinkhdr;
531	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
532	if (new_m_size>m->m_size)
533	m_inc(m, new_m_size);
534	}
535	memcpy(m->m_data, msrc->m_data, msrc->m_len);
536	m->m_len = msrc->m_len; /* copy msrc to m */
537
538	/* make the header of the reply packet */
539	ip = mtod(m, struct ip *);
540	hlen = sizeof(struct ip ); /* no options in reply */
541
542	/* fill in icmp */
543	m->m_data += hlen;
544	m->m_len -= hlen;
545
546	icp = mtod(m, struct icmp *);
547
548	if (minsize)
549	s_ip_len = shlen+ICMP_MINLEN; /* return header+8b only */
550	else if (s_ip_len > ICMP_MAXDATALEN) /* maximum size */
551	s_ip_len = ICMP_MAXDATALEN;
552
553	m->m_len = ICMP_MINLEN + s_ip_len; /* 8 bytes ICMP header */
554
555	/* min. size = 8+sizeof(struct ip)+8 */
556
557	icp->icmp_type = type;
558	icp->icmp_code = code;
559	icp->icmp_id = 0;
560	icp->icmp_seq = 0;
561
562	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
563	HTONS(icp->icmp_ip.ip_len);
564	HTONS(icp->icmp_ip.ip_id);
565	HTONS(icp->icmp_ip.ip_off);
566
567	#if DEBUG
568	if (message)
569	{
570	/* DEBUG : append message to ICMP packet */
571	int message_len;
572	char *cpnt;
573	message_len = strlen(message);
574	if (message_len > ICMP_MAXDATALEN)
575	message_len = ICMP_MAXDATALEN;
576	cpnt = (char *)m->m_data+m->m_len;
577	memcpy(cpnt, message, message_len);
578	m->m_len += message_len;
579	}
580	#endif
581
582	icp->icmp_cksum = 0;
583	icp->icmp_cksum = cksum(m, m->m_len);
584
585	m->m_data -= hlen;
586	m->m_len += hlen;
587
588	/* fill in ip */
589	ip->ip_hl = hlen >> 2;
590	ip->ip_len = m->m_len;
591
592	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
593
594	ip->ip_ttl = MAXTTL;
595	ip->ip_p = IPPROTO_ICMP;
596	ip->ip_dst = ip->ip_src; /* ip adresses */
597	ip->ip_src = alias_addr;
598
599	(void ) ip_output(pData, (struct socket *)NULL, m);
600
601	icmpstat.icps_reflect++;
602
603	end_error:
604	;
605	}
606	#undef ICMP_MAXDATALEN
607
608	/*
609	* Reflect the ip packet back to the source
610	*/
611	void
612	icmp_reflect(PNATState pData, struct mbuf *m)
613	{
614	register struct ip ip = mtod(m, struct ip );
615	int hlen = ip->ip_hl << 2;
616	int optlen = hlen - sizeof(struct ip );
617	register struct icmp *icp;
618
619	/*
620	* Send an icmp packet back to the ip level,
621	* after supplying a checksum.
622	*/
623	m->m_data += hlen;
624	m->m_len -= hlen;
625	icp = mtod(m, struct icmp *);
626
627	icp->icmp_cksum = 0;
628	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
629
630	m->m_data -= hlen;
631	m->m_len += hlen;
632
633	(void ) ip_output(pData, (struct socket *)NULL, m);
634
635	icmpstat.icps_reflect++;
636	}
637	#if defined(RT_OS_WINDOWS) && !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
638	static void WINAPI
639	notify_slirp(void *ctx)
640	{
641	/* pData name is important see slirp_state.h */
642	PNATState pData = (PNATState)ctx;
643	fIcmp = 1;
644	}
645	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 16614

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