ip_icmp.c@ 15133

Last change on this file since 15133 was 15133, checked in by vboxsync, 16 years ago
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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
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	insque(pData, &pData->icmp_socket, &udb);
82	#else /* RT_OS_WINDOWS */
83	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
84	if (pData->hmIcmpLibrary != NULL)
85	{
86	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
87	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
88	}
89	if (pData->pfIcmpParseReplies == NULL)
90	{
91	FreeLibrary(pData->hmIcmpLibrary);
92	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
93	if (pData->hmIcmpLibrary == NULL)
94	{
95	LogRel(("NAT: Icmp.dll could not be loaded\n"));
96	return 1;
97	}
98	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
99	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
100	}
101	if (pData->pfIcmpParseReplies == NULL)
102	{
103	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
104	FreeLibrary(pData->hmIcmpLibrary);
105	return 1;
106	}
107	pData->icmp_socket.s = IcmpCreateFile();
108	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
109	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
110	pData->pvIcmpBuffer = malloc(pData->szIcmpBuffer);
111	#endif /* RT_OS_WINDOWS */
112	LIST_INIT(&pData->icmp_msg_head);
113	return 0;
114	}
115
116	/*
117	* ip here is ip header + 64bytes readed from ICMP packet
118	*/
119	struct icmp_msg *
120	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
121	{
122	struct mbuf *m0;
123	struct ip *ip0;
124	struct icmp icp, icp0;
125	struct icmp_msg *icm;
126	int found = 0;
127	struct socket *head_socket;
128	struct in_addr laddr, faddr;
129	u_int lport, fport;
130
131	switch (ip->ip_p)
132	{
133	case IPPROTO_ICMP:
134	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
135	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
136	{
137	m0 = icm->im_m;
138	ip0 = mtod(m0, struct ip *);
139	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
140	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
141	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
142	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
143	&& icp->icmp_id == icp0->icmp_id
144	&& icp->icmp_seq == icp->icmp_seq)
145	{
146	found = 1;
147	break;
148	}
149	}
150	case IPPROTO_UDP:
151	head_socket = &udb;
152	case IPPROTO_TCP:
153	head_socket = (head_socket != NULL ? head_socket : &tcb); /* head_socket could be initialized with udb*/
154	}
155	if (found == 1)
156	return icm;
157
158	return NULL;
159	}
160
161	static int
162	icmp_attach(PNATState pData, struct mbuf *m)
163	{
164	struct icmp_msg *icm;
165	struct ip *ip;
166	ip = mtod(m, struct ip *);
167	Assert(ip->ip_p == IPPROTO_ICMP);
168	icm = malloc(sizeof(struct icmp_msg));
169	icm->im_m = m;
170	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
171	return (0);
172	}
173	#endif /* VBOX_WITH_SLIRP_ICMP */
174
175	/*
176	* Process a received ICMP message.
177	*/
178	void
179	icmp_input(PNATState pData, struct mbuf *m, int hlen)
180	{
181	register struct icmp *icp;
182	register struct ip ip=mtod(m, struct ip );
183	int icmplen=ip->ip_len;
184	int status;
185	/* int code; */
186
187	DEBUG_CALL("icmp_input");
188	DEBUG_ARG("m = %lx", (long )m);
189	DEBUG_ARG("m_len = %d", m->m_len);
190
191	icmpstat.icps_received++;
192
193	/*
194	* Locate icmp structure in mbuf, and check
195	* that its not corrupted and of at least minimum length.
196	*/
197	if (icmplen < ICMP_MINLEN)
198	{
199	/* min 8 bytes payload */
200	icmpstat.icps_tooshort++;
201	freeit:
202	m_freem(pData, m);
203	goto end_error;
204	}
205
206	m->m_len -= hlen;
207	m->m_data += hlen;
208	icp = mtod(m, struct icmp *);
209	if (cksum(m, icmplen))
210	{
211	icmpstat.icps_checksum++;
212	goto freeit;
213	}
214	m->m_len += hlen;
215	m->m_data -= hlen;
216
217	/* icmpstat.icps_inhist[icp->icmp_type]++; */
218	/* code = icp->icmp_code; */
219
220	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
221	switch (icp->icmp_type)
222	{
223	case ICMP_ECHO:
224	#ifndef VBOX_WITH_SLIRP_ICMP
225	icp->icmp_type = ICMP_ECHOREPLY;
226	#endif /* !VBOX_WITH_SLIRP_ICMP */
227
228	ip->ip_len += hlen; /* since ip_input subtracts this */
229	if (ip->ip_dst.s_addr == alias_addr.s_addr)
230	{
231	#ifdef VBOX_WITH_SLIRP_ICMP
232	icp->icmp_type = ICMP_ECHOREPLY;
233	#endif /* VBOX_WITH_SLIRP_ICMP */
234	icmp_reflect(pData, m);
235	}
236	else
237	{
238	struct socket *so;
239	struct sockaddr_in addr;
240	#ifndef VBOX_WITH_SLIRP_ICMP
241	if ((so = socreate()) == NULL)
242	goto freeit;
243	if (udp_attach(pData, so) == -1)
244	{
245	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
246	errno,strerror(errno)));
247	sofree(pData, so);
248	m_free(pData, m);
249	goto end_error;
250	}
251	so->so_m = m;
252	so->so_faddr = ip->ip_dst;
253	so->so_fport = htons(7);
254	so->so_laddr = ip->ip_src;
255	so->so_lport = htons(9);
256	so->so_iptos = ip->ip_tos;
257	so->so_type = IPPROTO_ICMP;
258	so->so_state = SS_ISFCONNECTED;
259
260	addr.sin_family = AF_INET;
261	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
262	{
263	/* It's an alias */
264	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
265	{
266	case CTL_DNS:
267	addr.sin_addr = dns_addr;
268	break;
269	case CTL_ALIAS:
270	default:
271	addr.sin_addr = loopback_addr;
272	break;
273	}
274	}
275	else
276	addr.sin_addr = so->so_faddr;
277	addr.sin_port = so->so_fport;
278	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
279	(struct sockaddr *)&addr, sizeof(addr)) == -1)
280	{
281	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
282	errno,strerror(errno)));
283	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
284	udp_detach(pData, so);
285	}
286	#else /* VBOX_WITH_SLIRP_ICMP */
287	# ifdef RT_OS_WINDOWS
288	IP_OPTION_INFORMATION ipopt;
289	int error;
290	# endif
291	addr.sin_family = AF_INET;
292	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
293	{
294	/* It's an alias */
295	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
296	{
297	case CTL_DNS:
298	addr.sin_addr = dns_addr;
299	break;
300	case CTL_ALIAS:
301	default:
302	addr.sin_addr = loopback_addr;
303	break;
304	}
305	}
306	else
307	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
308	icmp_attach(pData, m);
309	/* Send the packet */
310	# ifndef RT_OS_WINDOWS
311	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
312	if (status < 0)
313	{
314	LogRel(("error(%s) occured while setting TTL attribute of IP packet\n", strerror(errno)));
315	}
316	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
317	(struct sockaddr *)&addr, sizeof(addr)) == -1)
318	{
319	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
320	errno,strerror(errno)));
321	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
322	m_free(pData, m);
323	}
324	# else /* RT_OS_WINDOWS */
325	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
326	ipopt.Ttl = ip->ip_ttl;
327	status = IcmpSendEcho2(pData->icmp_socket.s, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
328	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data, icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
329	pData->pvIcmpBuffer, pData->szIcmpBuffer, 10);
330	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
331	{
332	error = GetLastError();
333	LogRel(("error(%d) occured while sending ICMP (", error()));
334	switch (error)
335	{
336	case ERROR_INVALID_PARAMETER:
337	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
338	break;
339	case ERROR_NOT_SUPPORTED:
340	LogRel(("operation is unsupported)\n"));
341	break;
342	case ERROR_NOT_ENOUGH_MEMORY:
343	LogRel(("OOM!!!"));
344	break;
345	case IP_BUF_TOO_SMALL:
346	LogRel(("Buffer too small)\n"));
347	break;
348	default:
349	LogRel(("Other error!!!)\n"));
350	break;
351	}
352	}
353	# endif /* RT_OS_WINDOWS */
354	#endif /* VBOX_WITH_SLIRP_ICMP */
355	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
356	break;
357	case ICMP_UNREACH:
358	/* XXX? report error? close socket? */
359	case ICMP_TIMXCEED:
360	case ICMP_PARAMPROB:
361	case ICMP_SOURCEQUENCH:
362	case ICMP_TSTAMP:
363	case ICMP_MASKREQ:
364	case ICMP_REDIRECT:
365	icmpstat.icps_notsupp++;
366	m_freem(pData, m);
367	break;
368
369	default:
370	icmpstat.icps_badtype++;
371	m_freem(pData, m);
372	} /* switch */
373
374	end_error:
375	/* m is m_free()'d xor put in a socket xor or given to ip_send */
376	;
377	}
378
379
380	/*
381	* Send an ICMP message in response to a situation
382	*
383	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
384	* MUST NOT change this header information.
385	* MUST NOT reply to a multicast/broadcast IP address.
386	* MUST NOT reply to a multicast/broadcast MAC address.
387	* MUST reply to only the first fragment.
388	*/
389	/*
390	* Send ICMP_UNREACH back to the source regarding msrc.
391	* mbuf *msrc is used as a template, but is NOT m_free()'d.
392	* It is reported as the bad ip packet. The header should
393	* be fully correct and in host byte order.
394	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
395	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
396	*/
397
398	#define ICMP_MAXDATALEN (IP_MSS-28)
399	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, char message)
400	{
401	unsigned hlen, shlen, s_ip_len;
402	register struct ip *ip;
403	register struct icmp *icp;
404	register struct mbuf *m;
405
406	DEBUG_CALL("icmp_error");
407	DEBUG_ARG("msrc = %lx", (long )msrc);
408	DEBUG_ARG("msrc_len = %d", msrc->m_len);
409
410	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
411	goto end_error;
412
413	/* check msrc */
414	if (!msrc)
415	goto end_error;
416
417	ip = mtod(msrc, struct ip *);
418	#if DEBUG
419	{
420	char bufa[20], bufb[20];
421	strcpy(bufa, inet_ntoa(ip->ip_src));
422	strcpy(bufb, inet_ntoa(ip->ip_dst));
423	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
424	}
425	#endif
426	if (ip->ip_off & IP_OFFMASK)
427	goto end_error; /* Only reply to fragment 0 */
428
429	shlen=ip->ip_hl << 2;
430	s_ip_len=ip->ip_len;
431	if (ip->ip_p == IPPROTO_ICMP)
432	{
433	icp = (struct icmp )((char )ip + shlen);
434	/*
435	* Assume any unknown ICMP type is an error. This isn't
436	* specified by the RFC, but think about it..
437	*/
438	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
439	goto end_error;
440	}
441
442	/* make a copy */
443	if (!(m=m_get(pData)))
444	goto end_error; /* get mbuf */
445	{
446	int new_m_size;
447	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
448	if (new_m_size>m->m_size)
449	m_inc(m, new_m_size);
450	}
451	memcpy(m->m_data, msrc->m_data, msrc->m_len);
452	m->m_len = msrc->m_len; /* copy msrc to m */
453
454	/* make the header of the reply packet */
455	ip = mtod(m, struct ip *);
456	hlen = sizeof(struct ip ); /* no options in reply */
457
458	/* fill in icmp */
459	m->m_data += hlen;
460	m->m_len -= hlen;
461
462	icp = mtod(m, struct icmp *);
463
464	if (minsize)
465	s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
466	else if (s_ip_len>ICMP_MAXDATALEN) /* maximum size */
467	s_ip_len=ICMP_MAXDATALEN;
468
469	m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
470
471	/* min. size = 8+sizeof(struct ip)+8 */
472
473	icp->icmp_type = type;
474	icp->icmp_code = code;
475	icp->icmp_id = 0;
476	icp->icmp_seq = 0;
477
478	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
479	HTONS(icp->icmp_ip.ip_len);
480	HTONS(icp->icmp_ip.ip_id);
481	HTONS(icp->icmp_ip.ip_off);
482
483	#if DEBUG
484	if (message)
485	{
486	/* DEBUG : append message to ICMP packet */
487	int message_len;
488	char *cpnt;
489	message_len=strlen(message);
490	if (message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
491	cpnt=(char *)m->m_data+m->m_len;
492	memcpy(cpnt, message, message_len);
493	m->m_len+=message_len;
494	}
495	#endif
496
497	icp->icmp_cksum = 0;
498	icp->icmp_cksum = cksum(m, m->m_len);
499
500	m->m_data -= hlen;
501	m->m_len += hlen;
502
503	/* fill in ip */
504	ip->ip_hl = hlen >> 2;
505	ip->ip_len = m->m_len;
506
507	ip->ip_tos=((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
508
509	ip->ip_ttl = MAXTTL;
510	ip->ip_p = IPPROTO_ICMP;
511	ip->ip_dst = ip->ip_src; /* ip adresses */
512	ip->ip_src = alias_addr;
513
514	(void ) ip_output(pData, (struct socket *)NULL, m);
515
516	icmpstat.icps_reflect++;
517
518	end_error:
519	;
520	}
521	#undef ICMP_MAXDATALEN
522
523	/*
524	* Reflect the ip packet back to the source
525	*/
526	void
527	icmp_reflect(PNATState pData, struct mbuf *m)
528	{
529	register struct ip ip = mtod(m, struct ip );
530	int hlen = ip->ip_hl << 2;
531	int optlen = hlen - sizeof(struct ip );
532	register struct icmp *icp;
533
534	/*
535	* Send an icmp packet back to the ip level,
536	* after supplying a checksum.
537	*/
538	m->m_data += hlen;
539	m->m_len -= hlen;
540	icp = mtod(m, struct icmp *);
541
542	icp->icmp_cksum = 0;
543	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
544
545	m->m_data -= hlen;
546	m->m_len += hlen;
547
548	#ifndef VBOX_WITH_SLIRP_ICMP
549	/* fill in ip */
550	if (optlen > 0)
551	{
552	/*
553	* Strip out original options by copying rest of first
554	* mbuf's data back, and adjust the IP length.
555	*/
556	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
557	(unsigned )(m->m_len - hlen));
558	hlen -= optlen;
559	ip->ip_hl = hlen >> 2;
560	ip->ip_len -= optlen;
561	m->m_len -= optlen;
562	}
563	ip->ip_ttl = MAXTTL;
564	{
565	/* swap */
566	struct in_addr icmp_dst;
567	icmp_dst = ip->ip_dst;
568	ip->ip_dst = ip->ip_src;
569	ip->ip_src = icmp_dst;
570	}
571	#endif /* !VBOX_WITH_SLIRP_ICMP */
572
573	(void ) ip_output(pData, (struct socket *)NULL, m);
574
575	icmpstat.icps_reflect++;
576	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15133

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