ip_icmp.c@ 15367

Last change on this file since 15367 was 15365, checked in by vboxsync, 16 years ago

slirp:icmp:

trying to socket list for traceroute searching shorter
sockets should be closed, which received ICMP packets (disabled need to be fixed)

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

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15367

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