ip_icmp.c@ 15143

Last change on this file since 15143 was 15143, checked in by vboxsync, 16 years ago
slirp:ICMP send of icmp packet happens (wireshark for detection)
Property svn:eol-style set to `native`
File size: 19.1 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	pData->icmp_socket.s = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP);
81	if (pData->icmp_socket.s == -1)
82	{
83	int rc = RTErrConvertFromErrno(errno);
84	LogRel(("NAT: ICMP/ping not available (could open ICMP socket, error %Rrc)\n", rc));
85	return 1;
86	}
87	insque(pData, &pData->icmp_socket, &udb);
88	#else /* RT_OS_WINDOWS */
89	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
90	if (pData->hmIcmpLibrary != NULL)
91	{
92	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
93	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
94	}
95	if (pData->pfIcmpParseReplies == NULL)
96	{
97	FreeLibrary(pData->hmIcmpLibrary);
98	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
99	if (pData->hmIcmpLibrary == NULL)
100	{
101	LogRel(("NAT: Icmp.dll could not be loaded\n"));
102	return 1;
103	}
104	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
105	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
106	}
107	if (pData->pfIcmpParseReplies == NULL)
108	{
109	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
110	FreeLibrary(pData->hmIcmpLibrary);
111	return 1;
112	}
113	pData->icmp_socket.sh = IcmpCreateFile();
114	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
115	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
116	pData->pvIcmpBuffer = malloc(pData->szIcmpBuffer);
117	#endif /* RT_OS_WINDOWS */
118	LIST_INIT(&pData->icmp_msg_head);
119	return 0;
120	}
121
122	/*
123	* ip here is ip header + 64bytes readed from ICMP packet
124	*/
125	struct icmp_msg *
126	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
127	{
128	struct mbuf *m0;
129	struct ip *ip0;
130	struct icmp icp, icp0;
131	struct icmp_msg *icm;
132	int found = 0;
133	struct socket *head_socket;
134	struct in_addr laddr, faddr;
135	u_int lport, fport;
136
137	switch (ip->ip_p)
138	{
139	case IPPROTO_ICMP:
140	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
141	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
142	{
143	m0 = icm->im_m;
144	ip0 = mtod(m0, struct ip *);
145	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
146	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
147	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
148	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
149	&& icp->icmp_id == icp0->icmp_id
150	&& icp->icmp_seq == icp->icmp_seq)
151	{
152	found = 1;
153	break;
154	}
155	}
156	case IPPROTO_UDP:
157	head_socket = &udb;
158	case IPPROTO_TCP:
159	head_socket = (head_socket != NULL ? head_socket : &tcb); /* head_socket could be initialized with udb*/
160	}
161	if (found == 1)
162	return icm;
163
164	return NULL;
165	}
166
167	static int
168	icmp_attach(PNATState pData, struct mbuf *m)
169	{
170	struct icmp_msg *icm;
171	struct ip *ip;
172	ip = mtod(m, struct ip *);
173	Assert(ip->ip_p == IPPROTO_ICMP);
174	icm = malloc(sizeof(struct icmp_msg));
175	icm->im_m = m;
176	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
177	return (0);
178	}
179	#endif /* VBOX_WITH_SLIRP_ICMP */
180
181	/*
182	* Process a received ICMP message.
183	*/
184	void
185	icmp_input(PNATState pData, struct mbuf *m, int hlen)
186	{
187	register struct icmp *icp;
188	register struct ip ip=mtod(m, struct ip );
189	int icmplen=ip->ip_len;
190	int status;
191	/* int code; */
192
193	DEBUG_CALL("icmp_input");
194	DEBUG_ARG("m = %lx", (long )m);
195	DEBUG_ARG("m_len = %d", m->m_len);
196
197	icmpstat.icps_received++;
198
199	/*
200	* Locate icmp structure in mbuf, and check
201	* that its not corrupted and of at least minimum length.
202	*/
203	if (icmplen < ICMP_MINLEN)
204	{
205	/* min 8 bytes payload */
206	icmpstat.icps_tooshort++;
207	freeit:
208	m_freem(pData, m);
209	goto end_error;
210	}
211
212	m->m_len -= hlen;
213	m->m_data += hlen;
214	icp = mtod(m, struct icmp *);
215	if (cksum(m, icmplen))
216	{
217	icmpstat.icps_checksum++;
218	goto freeit;
219	}
220	m->m_len += hlen;
221	m->m_data -= hlen;
222
223	/* icmpstat.icps_inhist[icp->icmp_type]++; */
224	/* code = icp->icmp_code; */
225
226	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
227	switch (icp->icmp_type)
228	{
229	case ICMP_ECHO:
230	#ifndef VBOX_WITH_SLIRP_ICMP
231	icp->icmp_type = ICMP_ECHOREPLY;
232	#endif /* !VBOX_WITH_SLIRP_ICMP */
233
234	ip->ip_len += hlen; /* since ip_input subtracts this */
235	if (ip->ip_dst.s_addr == alias_addr.s_addr)
236	{
237	#ifdef VBOX_WITH_SLIRP_ICMP
238	icp->icmp_type = ICMP_ECHOREPLY;
239	#endif /* VBOX_WITH_SLIRP_ICMP */
240	icmp_reflect(pData, m);
241	}
242	else
243	{
244	struct socket *so;
245	struct sockaddr_in addr;
246	#ifndef VBOX_WITH_SLIRP_ICMP
247	if ((so = socreate()) == NULL)
248	goto freeit;
249	if (udp_attach(pData, so) == -1)
250	{
251	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
252	errno,strerror(errno)));
253	sofree(pData, so);
254	m_free(pData, m);
255	goto end_error;
256	}
257	so->so_m = m;
258	so->so_faddr = ip->ip_dst;
259	so->so_fport = htons(7);
260	so->so_laddr = ip->ip_src;
261	so->so_lport = htons(9);
262	so->so_iptos = ip->ip_tos;
263	so->so_type = IPPROTO_ICMP;
264	so->so_state = SS_ISFCONNECTED;
265
266	addr.sin_family = AF_INET;
267	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
268	{
269	/* It's an alias */
270	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
271	{
272	case CTL_DNS:
273	addr.sin_addr = dns_addr;
274	break;
275	case CTL_ALIAS:
276	default:
277	addr.sin_addr = loopback_addr;
278	break;
279	}
280	}
281	else
282	addr.sin_addr = so->so_faddr;
283	addr.sin_port = so->so_fport;
284	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
285	(struct sockaddr *)&addr, sizeof(addr)) == -1)
286	{
287	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
288	errno,strerror(errno)));
289	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
290	udp_detach(pData, so);
291	}
292	#else /* VBOX_WITH_SLIRP_ICMP */
293	# ifdef RT_OS_WINDOWS
294	IP_OPTION_INFORMATION ipopt;
295	int error;
296	# endif
297	addr.sin_family = AF_INET;
298	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
299	{
300	/* It's an alias */
301	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
302	{
303	case CTL_DNS:
304	addr.sin_addr = dns_addr;
305	break;
306	case CTL_ALIAS:
307	default:
308	addr.sin_addr = loopback_addr;
309	break;
310	}
311	}
312	else
313	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
314	icmp_attach(pData, m);
315	/* Send the packet */
316	# ifndef RT_OS_WINDOWS
317	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
318	if (status < 0)
319	{
320	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n", strerror(errno)));
321	}
322	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
323	(struct sockaddr *)&addr, sizeof(addr)) == -1)
324	{
325	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
326	errno,strerror(errno)));
327	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
328	m_free(pData, m);
329	}
330	# else /* RT_OS_WINDOWS */
331	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
332	ipopt.Ttl = ip->ip_ttl;
333	status = IcmpSendEcho2(pData->icmp_socket.sh, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
334	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data,
335	icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
336	pData->pvIcmpBuffer, pData->szIcmpBuffer, 0);
337	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
338	{
339	error = GetLastError();
340	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
341	switch (error)
342	{
343	case ERROR_INVALID_PARAMETER:
344	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
345	break;
346	case ERROR_NOT_SUPPORTED:
347	LogRel(("operation is unsupported)\n"));
348	break;
349	case ERROR_NOT_ENOUGH_MEMORY:
350	LogRel(("OOM!!!)\n"));
351	break;
352	case IP_BUF_TOO_SMALL:
353	LogRel(("Buffer too small)\n"));
354	break;
355	default:
356	LogRel(("Other error!!!)\n"));
357	break;
358	}
359	}
360	# endif /* RT_OS_WINDOWS */
361	#endif /* VBOX_WITH_SLIRP_ICMP */
362	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
363	break;
364	case ICMP_UNREACH:
365	/* XXX? report error? close socket? */
366	case ICMP_TIMXCEED:
367	case ICMP_PARAMPROB:
368	case ICMP_SOURCEQUENCH:
369	case ICMP_TSTAMP:
370	case ICMP_MASKREQ:
371	case ICMP_REDIRECT:
372	icmpstat.icps_notsupp++;
373	m_freem(pData, m);
374	break;
375
376	default:
377	icmpstat.icps_badtype++;
378	m_freem(pData, m);
379	} /* switch */
380
381	end_error:
382	/* m is m_free()'d xor put in a socket xor or given to ip_send */
383	;
384	}
385
386
387	/*
388	* Send an ICMP message in response to a situation
389	*
390	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
391	* MUST NOT change this header information.
392	* MUST NOT reply to a multicast/broadcast IP address.
393	* MUST NOT reply to a multicast/broadcast MAC address.
394	* MUST reply to only the first fragment.
395	*/
396	/*
397	* Send ICMP_UNREACH back to the source regarding msrc.
398	* mbuf *msrc is used as a template, but is NOT m_free()'d.
399	* It is reported as the bad ip packet. The header should
400	* be fully correct and in host byte order.
401	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
402	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
403	*/
404
405	#define ICMP_MAXDATALEN (IP_MSS-28)
406	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, char message)
407	{
408	unsigned hlen, shlen, s_ip_len;
409	register struct ip *ip;
410	register struct icmp *icp;
411	register struct mbuf *m;
412
413	DEBUG_CALL("icmp_error");
414	DEBUG_ARG("msrc = %lx", (long )msrc);
415	DEBUG_ARG("msrc_len = %d", msrc->m_len);
416
417	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
418	goto end_error;
419
420	/* check msrc */
421	if (!msrc)
422	goto end_error;
423
424	ip = mtod(msrc, struct ip *);
425	#if DEBUG
426	{
427	char bufa[20], bufb[20];
428	strcpy(bufa, inet_ntoa(ip->ip_src));
429	strcpy(bufb, inet_ntoa(ip->ip_dst));
430	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
431	}
432	#endif
433	if (ip->ip_off & IP_OFFMASK)
434	goto end_error; /* Only reply to fragment 0 */
435
436	shlen=ip->ip_hl << 2;
437	s_ip_len=ip->ip_len;
438	if (ip->ip_p == IPPROTO_ICMP)
439	{
440	icp = (struct icmp )((char )ip + shlen);
441	/*
442	* Assume any unknown ICMP type is an error. This isn't
443	* specified by the RFC, but think about it..
444	*/
445	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
446	goto end_error;
447	}
448
449	/* make a copy */
450	if (!(m=m_get(pData)))
451	goto end_error; /* get mbuf */
452	{
453	int new_m_size;
454	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
455	if (new_m_size>m->m_size)
456	m_inc(m, new_m_size);
457	}
458	memcpy(m->m_data, msrc->m_data, msrc->m_len);
459	m->m_len = msrc->m_len; /* copy msrc to m */
460
461	/* make the header of the reply packet */
462	ip = mtod(m, struct ip *);
463	hlen = sizeof(struct ip ); /* no options in reply */
464
465	/* fill in icmp */
466	m->m_data += hlen;
467	m->m_len -= hlen;
468
469	icp = mtod(m, struct icmp *);
470
471	if (minsize)
472	s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
473	else if (s_ip_len>ICMP_MAXDATALEN) /* maximum size */
474	s_ip_len=ICMP_MAXDATALEN;
475
476	m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
477
478	/* min. size = 8+sizeof(struct ip)+8 */
479
480	icp->icmp_type = type;
481	icp->icmp_code = code;
482	icp->icmp_id = 0;
483	icp->icmp_seq = 0;
484
485	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
486	HTONS(icp->icmp_ip.ip_len);
487	HTONS(icp->icmp_ip.ip_id);
488	HTONS(icp->icmp_ip.ip_off);
489
490	#if DEBUG
491	if (message)
492	{
493	/* DEBUG : append message to ICMP packet */
494	int message_len;
495	char *cpnt;
496	message_len=strlen(message);
497	if (message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
498	cpnt=(char *)m->m_data+m->m_len;
499	memcpy(cpnt, message, message_len);
500	m->m_len+=message_len;
501	}
502	#endif
503
504	icp->icmp_cksum = 0;
505	icp->icmp_cksum = cksum(m, m->m_len);
506
507	m->m_data -= hlen;
508	m->m_len += hlen;
509
510	/* fill in ip */
511	ip->ip_hl = hlen >> 2;
512	ip->ip_len = m->m_len;
513
514	ip->ip_tos=((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
515
516	ip->ip_ttl = MAXTTL;
517	ip->ip_p = IPPROTO_ICMP;
518	ip->ip_dst = ip->ip_src; /* ip adresses */
519	ip->ip_src = alias_addr;
520
521	(void ) ip_output(pData, (struct socket *)NULL, m);
522
523	icmpstat.icps_reflect++;
524
525	end_error:
526	;
527	}
528	#undef ICMP_MAXDATALEN
529
530	/*
531	* Reflect the ip packet back to the source
532	*/
533	void
534	icmp_reflect(PNATState pData, struct mbuf *m)
535	{
536	register struct ip ip = mtod(m, struct ip );
537	int hlen = ip->ip_hl << 2;
538	int optlen = hlen - sizeof(struct ip );
539	register struct icmp *icp;
540
541	/*
542	* Send an icmp packet back to the ip level,
543	* after supplying a checksum.
544	*/
545	m->m_data += hlen;
546	m->m_len -= hlen;
547	icp = mtod(m, struct icmp *);
548
549	icp->icmp_cksum = 0;
550	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
551
552	m->m_data -= hlen;
553	m->m_len += hlen;
554
555	#ifndef VBOX_WITH_SLIRP_ICMP
556	/* fill in ip */
557	if (optlen > 0)
558	{
559	/*
560	* Strip out original options by copying rest of first
561	* mbuf's data back, and adjust the IP length.
562	*/
563	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
564	(unsigned )(m->m_len - hlen));
565	hlen -= optlen;
566	ip->ip_hl = hlen >> 2;
567	ip->ip_len -= optlen;
568	m->m_len -= optlen;
569	}
570	ip->ip_ttl = MAXTTL;
571	{
572	/* swap */
573	struct in_addr icmp_dst;
574	icmp_dst = ip->ip_dst;
575	ip->ip_dst = ip->ip_src;
576	ip->ip_src = icmp_dst;
577	}
578	#endif /* !VBOX_WITH_SLIRP_ICMP */
579
580	(void ) ip_output(pData, (struct socket *)NULL, m);
581
582	icmpstat.icps_reflect++;
583	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15143

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