ip_icmp.c@ 16688

Last change on this file since 16688 was 16653, checked in by vboxsync, 16 years ago
NAT: fixed memmory corruption in new Unix multiplexing mechanism
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File size: 21.6 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	#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	NSOCK_INC();
104	#else /* RT_OS_WINDOWS */
105	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
106	if (pData->hmIcmpLibrary != NULL)
107	{
108	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
109	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
110	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
111	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
112	}
113	if (pData->pfIcmpParseReplies == NULL)
114	{
115	FreeLibrary(pData->hmIcmpLibrary);
116	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
117	if (pData->hmIcmpLibrary == NULL)
118	{
119	LogRel(("NAT: Icmp.dll could not be loaded\n"));
120	return 1;
121	}
122	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
123	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
124	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
125	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
126	}
127	if (pData->pfIcmpParseReplies == NULL)
128	{
129	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
130	FreeLibrary(pData->hmIcmpLibrary);
131	return 1;
132	}
133	if (pData->pfIcmpCloseHandle == NULL)
134	{
135	LogRel(("NAT: Can't find IcmpCloseHandle symbol\n"));
136	FreeLibrary(pData->hmIcmpLibrary);
137	return 1;
138	}
139	pData->icmp_socket.sh = IcmpCreateFile();
140	# ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
141	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
142	# endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
143	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
144	pData->pvIcmpBuffer = RTMemAlloc(pData->szIcmpBuffer);
145	#endif /* RT_OS_WINDOWS */
146	LIST_INIT(&pData->icmp_msg_head);
147	return 0;
148	}
149
150	/*
151	* ip here is ip header + 64bytes readed from ICMP packet
152	*/
153	struct icmp_msg *
154	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
155	{
156	struct mbuf *m0;
157	struct ip *ip0;
158	struct icmp icp, icp0;
159	struct icmp_msg *icm = NULL;
160	int found = 0;
161	struct udphdr *udp;
162	struct tcphdr *tcp;
163	struct socket *head_socket = NULL;
164	struct socket *last_socket = NULL;
165	struct socket *so = NULL;
166	struct in_addr laddr, faddr;
167	u_short lport, fport;
168
169	laddr.s_addr = ~0;
170	faddr.s_addr = ~0;
171
172	lport = ~0;
173	fport = ~0;
174
175
176	Log(("%s: processing (proto:%d)\n", __FUNCTION__, ip->ip_p));
177	switch (ip->ip_p)
178	{
179	case IPPROTO_ICMP:
180	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
181	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
182	{
183	m0 = icm->im_m;
184	ip0 = mtod(m0, struct ip *);
185	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
186	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
187	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
188	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
189	&& icp->icmp_id == icp0->icmp_id
190	&& icp->icmp_seq == icp0->icmp_seq)
191	{
192	found = 1;
193	Log(("Have found %R[natsock]\n", icm->im_so));
194	break;
195	}
196	Log(("Have found nothing\n"));
197	}
198	break;
199
200	/*
201	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
202	* from which the IP package has been sent.
203	*/
204	case IPPROTO_UDP:
205	head_socket = &udb;
206	udp = (struct udphdr )((char )ip + (ip->ip_hl << 2));
207	faddr.s_addr = ip->ip_dst.s_addr;
208	fport = udp->uh_dport;
209	laddr.s_addr = ip->ip_src.s_addr;
210	lport = udp->uh_sport;
211	last_socket = udp_last_so;
212	/* fall through */
213
214	case IPPROTO_TCP:
215	if (head_socket == NULL)
216	{
217	tcp = (struct tcphdr )((char )ip + (ip->ip_hl << 2));
218	head_socket = &tcb; /* head_socket could be initialized with udb*/
219	faddr.s_addr = ip->ip_dst.s_addr;
220	fport = tcp->th_dport;
221	laddr.s_addr = ip->ip_src.s_addr;
222	lport = tcp->th_sport;
223	last_socket = tcp_last_so;
224	}
225	/* check last socket first */
226	if ( last_socket->so_faddr.s_addr == faddr.s_addr
227	&& last_socket->so_fport == fport
228	&& last_socket->so_hlport == lport)
229	{
230	found = 1;
231	so = last_socket;
232	goto sofound;
233	}
234	for (so = head_socket->so_prev; so != head_socket; so = so->so_prev)
235	{
236	/* Should be reaplaced by hash here */
237	Log(("trying:%R[natsock] against %R[IP4]:%d lport=%d hlport=%d\n", so, &faddr, fport, lport, so->so_hlport));
238	if ( so->so_faddr.s_addr == faddr.s_addr
239	&& so->so_fport == fport
240	&& so->so_hlport == lport)
241	{
242	found = 1;
243	break;
244	}
245	}
246	break;
247
248	default:
249	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
250	}
251	sofound:
252	if (found == 1 && icm == NULL)
253	{
254	icm = RTMemAlloc(sizeof(struct icmp_msg));
255	icm->im_m = so->so_m;
256	icm->im_so = so;
257	found = 1;
258	Log(("hit:%R[natsock]\n", so));
259	/*XXX: this storage not very long,
260	* better add flag if it should removed from lis
261	*/
262	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
263	return (icm);
264	}
265	if (found == 1)
266	return icm;
267
268	return NULL;
269	}
270
271	static int
272	icmp_attach(PNATState pData, struct mbuf *m)
273	{
274	struct icmp_msg *icm;
275	struct ip *ip;
276	ip = mtod(m, struct ip *);
277	Assert(ip->ip_p == IPPROTO_ICMP);
278	icm = RTMemAlloc(sizeof(struct icmp_msg));
279	icm->im_m = m;
280	icm->im_so = m->m_so;
281	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
282	return 0;
283	}
284
285	/*
286	* Process a received ICMP message.
287	*/
288	void
289	icmp_input(PNATState pData, struct mbuf *m, int hlen)
290	{
291	register struct icmp *icp;
292	register struct ip ip = mtod(m, struct ip );
293	int icmplen = ip->ip_len;
294	int status;
295	uint32_t dst;
296	#if !defined(RT_OS_WINDOWS)
297	int ttl;
298	#endif
299
300	/* int code; */
301
302	DEBUG_CALL("icmp_input");
303	DEBUG_ARG("m = %lx", (long )m);
304	DEBUG_ARG("m_len = %d", m->m_len);
305
306	icmpstat.icps_received++;
307
308	/*
309	* Locate icmp structure in mbuf, and check
310	* that its not corrupted and of at least minimum length.
311	*/
312	if (icmplen < ICMP_MINLEN)
313	{
314	/* min 8 bytes payload */
315	icmpstat.icps_tooshort++;
316	freeit:
317	m_freem(pData, m);
318	goto end_error;
319	}
320
321	m->m_len -= hlen;
322	m->m_data += hlen;
323	icp = mtod(m, struct icmp *);
324	if (cksum(m, icmplen))
325	{
326	icmpstat.icps_checksum++;
327	goto freeit;
328	}
329	m->m_len += hlen;
330	m->m_data -= hlen;
331
332	/* icmpstat.icps_inhist[icp->icmp_type]++; */
333	/* code = icp->icmp_code; */
334
335	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
336	switch (icp->icmp_type)
337	{
338	case ICMP_ECHO:
339	ip->ip_len += hlen; /* since ip_input subtracts this */
340	dst = ip->ip_dst.s_addr;
341	if (dst == alias_addr.s_addr)
342	{
343	icp->icmp_type = ICMP_ECHOREPLY;
344	ip->ip_dst.s_addr = ip->ip_src.s_addr;
345	ip->ip_src.s_addr = dst;
346	icmp_reflect(pData, m);
347	}
348	else
349	{
350	struct sockaddr_in addr;
351	#ifdef RT_OS_WINDOWS
352	IP_OPTION_INFORMATION ipopt;
353	int error;
354	#endif
355	addr.sin_family = AF_INET;
356	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
357	{
358	/* It's an alias */
359	switch (ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
360	{
361	case CTL_DNS:
362	#ifndef VBOX_WITH_MULTI_DNS
363	addr.sin_addr = dns_addr;
364	break;
365	#endif
366	case CTL_ALIAS:
367	default:
368	addr.sin_addr = loopback_addr;
369	break;
370	}
371	}
372	else
373	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
374	#ifndef RT_OS_WINDOWS
375	if (pData->icmp_socket.s != -1)
376	{
377	m->m_so = &pData->icmp_socket;
378	icmp_attach(pData, m);
379	ttl = ip->ip_ttl;
380	Log(("NAT/ICMP: try to set TTL(%d)\n", ttl));
381	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL,
382	(void *)&ttl, sizeof(ttl));
383	if (status < 0)
384	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n",
385	strerror(errno)));
386	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
387	(struct sockaddr *)&addr, sizeof(addr)) == -1)
388	{
389	Log((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
390	errno, strerror(errno)));
391	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
392	m_free(pData, m);
393	}
394	}
395	else
396	{
397	/*
398	* We're freeing the ICMP message, which unable sent or process.
399	* That behavior described in rfc 793, we shouldn't notify sender about
400	* fail of processing it's ICMP packets
401	*/
402	m_free(pData, m);
403	return;
404	}
405	#else /* RT_OS_WINDOWS */
406	icmp_attach(pData, m);
407	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
408	pData->icmp_socket.so_icmp_id = icp->icmp_id;
409	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
410	m->m_so = &pData->icmp_socket;
411	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
412	ipopt.Ttl = ip->ip_ttl;
413	status = ICMP_SEND_ECHO(pData->phEvents[VBOX_ICMP_EVENT_INDEX], notify_slirp, addr.sin_addr.s_addr,
414	icp->icmp_data, icmplen - ICMP_MINLEN, &ipopt);
415	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
416	{
417	error = GetLastError();
418	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
419	switch (error)
420	{
421	case ERROR_INVALID_PARAMETER:
422	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
423	break;
424	case ERROR_NOT_SUPPORTED:
425	LogRel(("operation is unsupported)\n"));
426	break;
427	case ERROR_NOT_ENOUGH_MEMORY:
428	LogRel(("OOM!!!)\n"));
429	break;
430	case IP_BUF_TOO_SMALL:
431	LogRel(("Buffer too small)\n"));
432	break;
433	default:
434	LogRel(("Other error!!!)\n"));
435	break;
436	}
437	}
438	#endif /* RT_OS_WINDOWS */
439	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
440	break;
441	case ICMP_UNREACH:
442	/* XXX? report error? close socket? */
443	case ICMP_TIMXCEED:
444	case ICMP_PARAMPROB:
445	case ICMP_SOURCEQUENCH:
446	case ICMP_TSTAMP:
447	case ICMP_MASKREQ:
448	case ICMP_REDIRECT:
449	icmpstat.icps_notsupp++;
450	m_freem(pData, m);
451	break;
452
453	default:
454	icmpstat.icps_badtype++;
455	m_freem(pData, m);
456	} /* switch */
457
458	end_error:
459	/* m is m_free()'d xor put in a socket xor or given to ip_send */
460	;
461	}
462
463
464	/*
465	* Send an ICMP message in response to a situation
466	*
467	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
468	* MUST NOT change this header information.
469	* MUST NOT reply to a multicast/broadcast IP address.
470	* MUST NOT reply to a multicast/broadcast MAC address.
471	* MUST reply to only the first fragment.
472	*/
473	/*
474	* Send ICMP_UNREACH back to the source regarding msrc.
475	* mbuf *msrc is used as a template, but is NOT m_free()'d.
476	* It is reported as the bad ip packet. The header should
477	* be fully correct and in host byte order.
478	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
479	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
480	*/
481
482	#define ICMP_MAXDATALEN (IP_MSS-28)
483	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, const char message)
484	{
485	unsigned hlen, shlen, s_ip_len;
486	register struct ip *ip;
487	register struct icmp *icp;
488	register struct mbuf *m;
489
490	DEBUG_CALL("icmp_error");
491	DEBUG_ARG("msrc = %lx", (long )msrc);
492	DEBUG_ARG("msrc_len = %d", msrc->m_len);
493
494	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
495	goto end_error;
496
497	/* check msrc */
498	if (!msrc)
499	goto end_error;
500
501	ip = mtod(msrc, struct ip *);
502	#if DEBUG
503	{
504	char bufa[20], bufb[20];
505	strcpy(bufa, inet_ntoa(ip->ip_src));
506	strcpy(bufb, inet_ntoa(ip->ip_dst));
507	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
508	}
509	#endif
510	if (ip->ip_off & IP_OFFMASK)
511	goto end_error; /* Only reply to fragment 0 */
512
513	shlen = ip->ip_hl << 2;
514	s_ip_len = ip->ip_len;
515	if (ip->ip_p == IPPROTO_ICMP)
516	{
517	icp = (struct icmp )((char )ip + shlen);
518	/*
519	* Assume any unknown ICMP type is an error. This isn't
520	* specified by the RFC, but think about it..
521	*/
522	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
523	goto end_error;
524	}
525
526	/* make a copy */
527	if (!(m = m_get(pData)))
528	goto end_error; /* get mbuf */
529	{
530	int new_m_size;
531	m->m_data += if_maxlinkhdr;
532	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
533	if (new_m_size>m->m_size)
534	m_inc(m, new_m_size);
535	}
536	memcpy(m->m_data, msrc->m_data, msrc->m_len);
537	m->m_len = msrc->m_len; /* copy msrc to m */
538
539	/* make the header of the reply packet */
540	ip = mtod(m, struct ip *);
541	hlen = sizeof(struct ip ); /* no options in reply */
542
543	/* fill in icmp */
544	m->m_data += hlen;
545	m->m_len -= hlen;
546
547	icp = mtod(m, struct icmp *);
548
549	if (minsize)
550	s_ip_len = shlen+ICMP_MINLEN; /* return header+8b only */
551	else if (s_ip_len > ICMP_MAXDATALEN) /* maximum size */
552	s_ip_len = ICMP_MAXDATALEN;
553
554	m->m_len = ICMP_MINLEN + s_ip_len; /* 8 bytes ICMP header */
555
556	/* min. size = 8+sizeof(struct ip)+8 */
557
558	icp->icmp_type = type;
559	icp->icmp_code = code;
560	icp->icmp_id = 0;
561	icp->icmp_seq = 0;
562
563	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
564	HTONS(icp->icmp_ip.ip_len);
565	HTONS(icp->icmp_ip.ip_id);
566	HTONS(icp->icmp_ip.ip_off);
567
568	#if DEBUG
569	if (message)
570	{
571	/* DEBUG : append message to ICMP packet */
572	int message_len;
573	char *cpnt;
574	message_len = strlen(message);
575	if (message_len > ICMP_MAXDATALEN)
576	message_len = ICMP_MAXDATALEN;
577	cpnt = (char *)m->m_data+m->m_len;
578	memcpy(cpnt, message, message_len);
579	m->m_len += message_len;
580	}
581	#endif
582
583	icp->icmp_cksum = 0;
584	icp->icmp_cksum = cksum(m, m->m_len);
585
586	m->m_data -= hlen;
587	m->m_len += hlen;
588
589	/* fill in ip */
590	ip->ip_hl = hlen >> 2;
591	ip->ip_len = m->m_len;
592
593	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
594
595	ip->ip_ttl = MAXTTL;
596	ip->ip_p = IPPROTO_ICMP;
597	ip->ip_dst = ip->ip_src; /* ip adresses */
598	ip->ip_src = alias_addr;
599
600	(void ) ip_output(pData, (struct socket *)NULL, m);
601
602	icmpstat.icps_reflect++;
603
604	end_error:
605	;
606	}
607	#undef ICMP_MAXDATALEN
608
609	/*
610	* Reflect the ip packet back to the source
611	*/
612	void
613	icmp_reflect(PNATState pData, struct mbuf *m)
614	{
615	register struct ip ip = mtod(m, struct ip );
616	int hlen = ip->ip_hl << 2;
617	int optlen = hlen - sizeof(struct ip );
618	register struct icmp *icp;
619
620	/*
621	* Send an icmp packet back to the ip level,
622	* after supplying a checksum.
623	*/
624	m->m_data += hlen;
625	m->m_len -= hlen;
626	icp = mtod(m, struct icmp *);
627
628	icp->icmp_cksum = 0;
629	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
630
631	m->m_data -= hlen;
632	m->m_len += hlen;
633
634	(void ) ip_output(pData, (struct socket *)NULL, m);
635
636	icmpstat.icps_reflect++;
637	}
638	#if defined(RT_OS_WINDOWS) && !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
639	static void WINAPI
640	notify_slirp(void *ctx)
641	{
642	/* pData name is important see slirp_state.h */
643	PNATState pData = (PNATState)ctx;
644	fIcmp = 1;
645	}
646	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 16688

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