ip_icmp.c@ 15407

Last change on this file since 15407 was 15407, checked in by vboxsync, 16 years ago
slirp:icmp: revert 40841
Property svn:eol-style set to `native`
File size: 22.6 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
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 = NULL;
149	struct socket *last_socket = NULL;
150	struct socket *so = NULL;
151	struct in_addr laddr, faddr;
152	u_int lport, fport;
153
154	laddr.s_addr = ~0;
155	faddr.s_addr = ~0;
156
157	lport = ~0;
158	fport = ~0;
159
160
161	LogRel(("%s: processing (proto:%d)\n", __FUNCTION__, ip->ip_p));
162	switch (ip->ip_p)
163	{
164	case IPPROTO_ICMP:
165	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
166	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
167	{
168	m0 = icm->im_m;
169	ip0 = mtod(m0, struct ip *);
170	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
171	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
172	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
173	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
174	&& icp->icmp_id == icp0->icmp_id
175	&& icp->icmp_seq == icp->icmp_seq)
176	{
177	found = 1;
178	break;
179	}
180	LogRel(("Have found nothing\n"));
181	}
182	break;
183
184	/*
185	* for TCP and UDP logic little bit reverted, we try to find the HOST socket
186	* from which the IP package has been sent.
187	*/
188	case IPPROTO_UDP:
189	head_socket = &udb;
190	udp = (struct udphdr )((char )ip + (ip->ip_hl << 2));
191	faddr.s_addr = ip->ip_dst.s_addr;
192	fport = udp->uh_dport;
193	laddr.s_addr = ip->ip_src.s_addr;
194	lport = udp->uh_sport;
195	last_socket = udp_last_so;
196	/* fall through */
197
198	case IPPROTO_TCP:
199	if (head_socket == NULL)
200	{
201	tcp = (struct tcphdr )((char )ip + (ip->ip_hl << 2));
202	head_socket = &tcb; /* head_socket could be initialized with udb*/
203	faddr.s_addr = ip->ip_dst.s_addr;
204	fport = tcp->th_dport;
205	laddr.s_addr = ip->ip_src.s_addr;
206	lport = tcp->th_sport;
207	last_socket = tcp_last_so;
208	}
209	/* check last socket first */
210	if ( last_socket->so_faddr.s_addr == faddr.s_addr
211	&& last_socket->so_fport == fport
212	&& last_socket->so_hlport == lport)
213	{
214	found = 1;
215	so = last_socket;
216	goto sofound;
217	}
218	for (so = head_socket->so_prev; so != head_socket; so = so->so_prev)
219	{
220	/* Should be reaplaced by hash here */
221	LogRel(("trying:%R[natsock] against %R[IP4]:%d lport=%d hlport=%d\n", so, &faddr, fport, lport, so->so_hlport));
222	if ( so->so_faddr.s_addr == faddr.s_addr
223	&& so->so_fport == fport
224	&& so->so_hlport == lport)
225	{
226	found = 1;
227	break;
228	}
229	}
230	break;
231
232	default:
233	LogRel(("%s:ICMP: unsupported protocol(%d)\n", __FUNCTION__, ip->ip_p));
234	}
235	sofound:
236	if (found == 1 && icm == NULL)
237	{
238	icm = malloc(sizeof(struct icmp_msg));
239	icm->im_m = so->so_m;
240	icm->im_so = so;
241	found = 1;
242	LogRel(("hit:%R[natsock]\n", so));
243	/*XXX: this storage not very long,
244	* better add flag if it should removed from lis
245	*/
246	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
247	return (icm);
248	}
249	if (found == 1)
250	return icm;
251
252	return NULL;
253	}
254
255	static int
256	icmp_attach(PNATState pData, struct mbuf *m)
257	{
258	struct icmp_msg *icm;
259	struct ip *ip;
260	ip = mtod(m, struct ip *);
261	Assert(ip->ip_p == IPPROTO_ICMP);
262	icm = malloc(sizeof(struct icmp_msg));
263	icm->im_m = m;
264	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
265	return 0;
266	}
267	#endif /* VBOX_WITH_SLIRP_ICMP */
268
269	/*
270	* Process a received ICMP message.
271	*/
272	void
273	icmp_input(PNATState pData, struct mbuf *m, int hlen)
274	{
275	register struct icmp *icp;
276	register struct ip ip = mtod(m, struct ip );
277	int icmplen = ip->ip_len;
278	int status;
279	uint32_t dst;
280
281	/* int code; */
282
283	DEBUG_CALL("icmp_input");
284	DEBUG_ARG("m = %lx", (long )m);
285	DEBUG_ARG("m_len = %d", m->m_len);
286
287	icmpstat.icps_received++;
288
289	/*
290	* Locate icmp structure in mbuf, and check
291	* that its not corrupted and of at least minimum length.
292	*/
293	if (icmplen < ICMP_MINLEN)
294	{
295	/* min 8 bytes payload */
296	icmpstat.icps_tooshort++;
297	freeit:
298	m_freem(pData, m);
299	goto end_error;
300	}
301
302	m->m_len -= hlen;
303	m->m_data += hlen;
304	icp = mtod(m, struct icmp *);
305	if (cksum(m, icmplen))
306	{
307	icmpstat.icps_checksum++;
308	goto freeit;
309	}
310	m->m_len += hlen;
311	m->m_data -= hlen;
312
313	/* icmpstat.icps_inhist[icp->icmp_type]++; */
314	/* code = icp->icmp_code; */
315
316	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
317	switch (icp->icmp_type)
318	{
319	case ICMP_ECHO:
320	#ifndef VBOX_WITH_SLIRP_ICMP
321	icp->icmp_type = ICMP_ECHOREPLY;
322	#endif /* !VBOX_WITH_SLIRP_ICMP */
323
324	ip->ip_len += hlen; /* since ip_input subtracts this */
325	dst = ip->ip_dst.s_addr;
326	if (dst == alias_addr.s_addr)
327	{
328	#ifdef VBOX_WITH_SLIRP_ICMP
329	icp->icmp_type = ICMP_ECHOREPLY;
330	ip->ip_dst.s_addr = ip->ip_src.s_addr;
331	ip->ip_src.s_addr = dst;
332	#endif /* VBOX_WITH_SLIRP_ICMP */
333	icmp_reflect(pData, m);
334	}
335	else
336	{
337	struct socket *so;
338	struct sockaddr_in addr;
339	#ifndef VBOX_WITH_SLIRP_ICMP
340	if ((so = socreate()) == NULL)
341	goto freeit;
342	if (udp_attach(pData, so) == -1)
343	{
344	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
345	errno,strerror(errno)));
346	sofree(pData, so);
347	m_free(pData, m);
348	goto end_error;
349	}
350	so->so_m = m;
351	so->so_faddr = ip->ip_dst;
352	so->so_fport = htons(7);
353	so->so_laddr = ip->ip_src;
354	so->so_lport = htons(9);
355	so->so_iptos = ip->ip_tos;
356	so->so_type = IPPROTO_ICMP;
357	so->so_state = SS_ISFCONNECTED;
358
359	addr.sin_family = AF_INET;
360	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
361	{
362	/* It's an alias */
363	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
364	{
365	case CTL_DNS:
366	addr.sin_addr = dns_addr;
367	break;
368	case CTL_ALIAS:
369	default:
370	addr.sin_addr = loopback_addr;
371	break;
372	}
373	}
374	else
375	addr.sin_addr = so->so_faddr;
376	addr.sin_port = so->so_fport;
377	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
378	(struct sockaddr *)&addr, sizeof(addr)) == -1)
379	{
380	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
381	errno,strerror(errno)));
382	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
383	udp_detach(pData, so);
384	}
385	#else /* VBOX_WITH_SLIRP_ICMP */
386	# ifdef RT_OS_WINDOWS
387	IP_OPTION_INFORMATION ipopt;
388	int error;
389	# endif
390	addr.sin_family = AF_INET;
391	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
392	{
393	/* It's an alias */
394	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
395	{
396	case CTL_DNS:
397	addr.sin_addr = dns_addr;
398	break;
399	case CTL_ALIAS:
400	default:
401	addr.sin_addr = loopback_addr;
402	break;
403	}
404	}
405	else
406	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
407	icmp_attach(pData, m);
408	/* Send the packet */
409	# ifndef RT_OS_WINDOWS
410	LogRel(("NAT/ICMP: try to set TTL(%d)\n", ip->ip_ttl));
411	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
412	if (status < 0)
413	{
414	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n", strerror(errno)));
415	}
416	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
417	(struct sockaddr *)&addr, sizeof(addr)) == -1)
418	{
419	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
420	errno,strerror(errno)));
421	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
422	m_free(pData, m);
423	}
424	# else /* RT_OS_WINDOWS */
425	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
426	pData->icmp_socket.so_icmp_id = icp->icmp_id;
427	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
428	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
429	ipopt.Ttl = ip->ip_ttl;
430	status = IcmpSendEcho2(pData->icmp_socket.sh, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
431	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data,
432	icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
433	pData->pvIcmpBuffer, pData->szIcmpBuffer, 1);
434	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
435	{
436	error = GetLastError();
437	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
438	switch (error)
439	{
440	case ERROR_INVALID_PARAMETER:
441	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
442	break;
443	case ERROR_NOT_SUPPORTED:
444	LogRel(("operation is unsupported)\n"));
445	break;
446	case ERROR_NOT_ENOUGH_MEMORY:
447	LogRel(("OOM!!!)\n"));
448	break;
449	case IP_BUF_TOO_SMALL:
450	LogRel(("Buffer too small)\n"));
451	break;
452	default:
453	LogRel(("Other error!!!)\n"));
454	break;
455	}
456	}
457	# endif /* RT_OS_WINDOWS */
458	#endif /* VBOX_WITH_SLIRP_ICMP */
459	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
460	break;
461	case ICMP_UNREACH:
462	/* XXX? report error? close socket? */
463	case ICMP_TIMXCEED:
464	case ICMP_PARAMPROB:
465	case ICMP_SOURCEQUENCH:
466	case ICMP_TSTAMP:
467	case ICMP_MASKREQ:
468	case ICMP_REDIRECT:
469	icmpstat.icps_notsupp++;
470	m_freem(pData, m);
471	break;
472
473	default:
474	icmpstat.icps_badtype++;
475	m_freem(pData, m);
476	} /* switch */
477
478	end_error:
479	/* m is m_free()'d xor put in a socket xor or given to ip_send */
480	;
481	}
482
483
484	/*
485	* Send an ICMP message in response to a situation
486	*
487	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
488	* MUST NOT change this header information.
489	* MUST NOT reply to a multicast/broadcast IP address.
490	* MUST NOT reply to a multicast/broadcast MAC address.
491	* MUST reply to only the first fragment.
492	*/
493	/*
494	* Send ICMP_UNREACH back to the source regarding msrc.
495	* mbuf *msrc is used as a template, but is NOT m_free()'d.
496	* It is reported as the bad ip packet. The header should
497	* be fully correct and in host byte order.
498	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
499	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
500	*/
501
502	#define ICMP_MAXDATALEN (IP_MSS-28)
503	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, const char message)
504	{
505	unsigned hlen, shlen, s_ip_len;
506	register struct ip *ip;
507	register struct icmp *icp;
508	register struct mbuf *m;
509
510	DEBUG_CALL("icmp_error");
511	DEBUG_ARG("msrc = %lx", (long )msrc);
512	DEBUG_ARG("msrc_len = %d", msrc->m_len);
513
514	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
515	goto end_error;
516
517	/* check msrc */
518	if (!msrc)
519	goto end_error;
520
521	ip = mtod(msrc, struct ip *);
522	#if DEBUG
523	{
524	char bufa[20], bufb[20];
525	strcpy(bufa, inet_ntoa(ip->ip_src));
526	strcpy(bufb, inet_ntoa(ip->ip_dst));
527	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
528	}
529	#endif
530	if (ip->ip_off & IP_OFFMASK)
531	goto end_error; /* Only reply to fragment 0 */
532
533	shlen = ip->ip_hl << 2;
534	s_ip_len = ip->ip_len;
535	if (ip->ip_p == IPPROTO_ICMP)
536	{
537	icp = (struct icmp )((char )ip + shlen);
538	/*
539	* Assume any unknown ICMP type is an error. This isn't
540	* specified by the RFC, but think about it..
541	*/
542	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
543	goto end_error;
544	}
545
546	/* make a copy */
547	if (!(m = m_get(pData)))
548	goto end_error; /* get mbuf */
549	{
550	int new_m_size;
551	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
552	if (new_m_size>m->m_size)
553	m_inc(m, new_m_size);
554	}
555	memcpy(m->m_data, msrc->m_data, msrc->m_len);
556	m->m_len = msrc->m_len; /* copy msrc to m */
557
558	/* make the header of the reply packet */
559	ip = mtod(m, struct ip *);
560	hlen = sizeof(struct ip ); /* no options in reply */
561
562	/* fill in icmp */
563	m->m_data += hlen;
564	m->m_len -= hlen;
565
566	icp = mtod(m, struct icmp *);
567
568	if (minsize)
569	s_ip_len = shlen+ICMP_MINLEN; /* return header+8b only */
570	else if (s_ip_len > ICMP_MAXDATALEN) /* maximum size */
571	s_ip_len = ICMP_MAXDATALEN;
572
573	m->m_len = ICMP_MINLEN + s_ip_len; /* 8 bytes ICMP header */
574
575	/* min. size = 8+sizeof(struct ip)+8 */
576
577	icp->icmp_type = type;
578	icp->icmp_code = code;
579	icp->icmp_id = 0;
580	icp->icmp_seq = 0;
581
582	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
583	HTONS(icp->icmp_ip.ip_len);
584	HTONS(icp->icmp_ip.ip_id);
585	HTONS(icp->icmp_ip.ip_off);
586
587	#if DEBUG
588	if (message)
589	{
590	/* DEBUG : append message to ICMP packet */
591	int message_len;
592	char *cpnt;
593	message_len = strlen(message);
594	if (message_len > ICMP_MAXDATALEN)
595	message_len = ICMP_MAXDATALEN;
596	cpnt = (char *)m->m_data+m->m_len;
597	memcpy(cpnt, message, message_len);
598	m->m_len += message_len;
599	}
600	#endif
601
602	icp->icmp_cksum = 0;
603	icp->icmp_cksum = cksum(m, m->m_len);
604
605	m->m_data -= hlen;
606	m->m_len += hlen;
607
608	/* fill in ip */
609	ip->ip_hl = hlen >> 2;
610	ip->ip_len = m->m_len;
611
612	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
613
614	ip->ip_ttl = MAXTTL;
615	ip->ip_p = IPPROTO_ICMP;
616	ip->ip_dst = ip->ip_src; /* ip adresses */
617	ip->ip_src = alias_addr;
618
619	(void ) ip_output(pData, (struct socket *)NULL, m);
620
621	icmpstat.icps_reflect++;
622
623	end_error:
624	;
625	}
626	#undef ICMP_MAXDATALEN
627
628	/*
629	* Reflect the ip packet back to the source
630	*/
631	void
632	icmp_reflect(PNATState pData, struct mbuf *m)
633	{
634	register struct ip ip = mtod(m, struct ip );
635	int hlen = ip->ip_hl << 2;
636	int optlen = hlen - sizeof(struct ip );
637	register struct icmp *icp;
638
639	/*
640	* Send an icmp packet back to the ip level,
641	* after supplying a checksum.
642	*/
643	m->m_data += hlen;
644	m->m_len -= hlen;
645	icp = mtod(m, struct icmp *);
646
647	icp->icmp_cksum = 0;
648	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
649
650	m->m_data -= hlen;
651	m->m_len += hlen;
652
653	#ifndef VBOX_WITH_SLIRP_ICMP
654	/* fill in ip */
655	if (optlen > 0)
656	{
657	/*
658	* Strip out original options by copying rest of first
659	* mbuf's data back, and adjust the IP length.
660	*/
661	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
662	(unsigned )(m->m_len - hlen));
663	hlen -= optlen;
664	ip->ip_hl = hlen >> 2;
665	ip->ip_len -= optlen;
666	m->m_len -= optlen;
667	}
668	ip->ip_ttl = MAXTTL;
669	{
670	/* swap */
671	struct in_addr icmp_dst;
672	icmp_dst = ip->ip_dst;
673	ip->ip_dst = ip->ip_src;
674	ip->ip_src = icmp_dst;
675	}
676	#endif /* !VBOX_WITH_SLIRP_ICMP */
677
678	(void ) ip_output(pData, (struct socket *)NULL, m);
679
680	icmpstat.icps_reflect++;
681	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15407

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