ip_icmp.c@ 15223

Last change on this file since 15223 was 15222, checked in by vboxsync, 16 years ago
slirp: fix burns
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File size: 19.9 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	#else /* RT_OS_WINDOWS */
88	pData->hmIcmpLibrary = LoadLibrary("Iphlpapi.dll");
89	if (pData->hmIcmpLibrary != NULL)
90	{
91	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
92	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
93	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
94	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
95	}
96	if (pData->pfIcmpParseReplies == NULL)
97	{
98	FreeLibrary(pData->hmIcmpLibrary);
99	pData->hmIcmpLibrary = LoadLibrary("Icmp.dll");
100	if (pData->hmIcmpLibrary == NULL)
101	{
102	LogRel(("NAT: Icmp.dll could not be loaded\n"));
103	return 1;
104	}
105	pData->pfIcmpParseReplies = (long (WINAPI )(void , long))
106	GetProcAddress(pData->hmIcmpLibrary, "IcmpParseReplies");
107	pData->pfIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
108	GetProcAddress(pData->hmIcmpLibrary, "IcmpCloseHandle");
109	}
110	if (pData->pfIcmpParseReplies == NULL)
111	{
112	LogRel(("NAT: Can't find IcmpParseReplies symbol\n"));
113	FreeLibrary(pData->hmIcmpLibrary);
114	return 1;
115	}
116	if (pData->pfIcmpCloseHandle == NULL)
117	{
118	LogRel(("NAT: Can't find IcmpCloseHandle symbol\n"));
119	FreeLibrary(pData->hmIcmpLibrary);
120	return 1;
121	}
122	pData->icmp_socket.sh = IcmpCreateFile();
123	pData->phEvents[VBOX_ICMP_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
124	pData->szIcmpBuffer = sizeof(ICMP_ECHO_REPLY) * 10;
125	pData->pvIcmpBuffer = malloc(pData->szIcmpBuffer);
126	#endif /* RT_OS_WINDOWS */
127	LIST_INIT(&pData->icmp_msg_head);
128	return 0;
129	}
130
131	/*
132	* ip here is ip header + 64bytes readed from ICMP packet
133	*/
134	struct icmp_msg *
135	icmp_find_original_mbuf(PNATState pData, struct ip *ip)
136	{
137	struct mbuf *m0;
138	struct ip *ip0;
139	struct icmp icp, icp0;
140	struct icmp_msg *icm = NULL;
141	int found = 0;
142	struct socket *head_socket;
143	struct in_addr laddr, faddr;
144	u_int lport, fport;
145
146	switch (ip->ip_p)
147	{
148	case IPPROTO_ICMP:
149	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
150	LIST_FOREACH(icm, &pData->icmp_msg_head, im_list)
151	{
152	m0 = icm->im_m;
153	ip0 = mtod(m0, struct ip *);
154	AssertRelease(ip0->ip_p == IPPROTO_ICMP);
155	icp0 = (struct icmp )((char )ip0 + (ip0->ip_hl << 2));
156	if ( ( (icp->icmp_type != ICMP_ECHO && ip->ip_src.s_addr == ip0->ip_dst.s_addr)
157	\|\| (icp->icmp_type == ICMP_ECHO && ip->ip_dst.s_addr == ip0->ip_dst.s_addr))
158	&& icp->icmp_id == icp0->icmp_id
159	&& icp->icmp_seq == icp->icmp_seq)
160	{
161	found = 1;
162	break;
163	}
164	}
165	case IPPROTO_UDP:
166	head_socket = &udb;
167	case IPPROTO_TCP:
168	head_socket = (head_socket != NULL ? head_socket : &tcb); /* head_socket could be initialized with udb*/
169	}
170	if (found == 1)
171	return icm;
172
173	return NULL;
174	}
175
176	static int
177	icmp_attach(PNATState pData, struct mbuf *m)
178	{
179	struct icmp_msg *icm;
180	struct ip *ip;
181	ip = mtod(m, struct ip *);
182	Assert(ip->ip_p == IPPROTO_ICMP);
183	icm = malloc(sizeof(struct icmp_msg));
184	icm->im_m = m;
185	LIST_INSERT_HEAD(&pData->icmp_msg_head, icm, im_list);
186	return (0);
187	}
188	#endif /* VBOX_WITH_SLIRP_ICMP */
189
190	/*
191	* Process a received ICMP message.
192	*/
193	void
194	icmp_input(PNATState pData, struct mbuf *m, int hlen)
195	{
196	register struct icmp *icp;
197	register struct ip ip=mtod(m, struct ip );
198	int icmplen=ip->ip_len;
199	int status;
200	uint32_t dst;
201
202	/* int code; */
203
204	DEBUG_CALL("icmp_input");
205	DEBUG_ARG("m = %lx", (long )m);
206	DEBUG_ARG("m_len = %d", m->m_len);
207
208	icmpstat.icps_received++;
209
210	/*
211	* Locate icmp structure in mbuf, and check
212	* that its not corrupted and of at least minimum length.
213	*/
214	if (icmplen < ICMP_MINLEN)
215	{
216	/* min 8 bytes payload */
217	icmpstat.icps_tooshort++;
218	freeit:
219	m_freem(pData, m);
220	goto end_error;
221	}
222
223	m->m_len -= hlen;
224	m->m_data += hlen;
225	icp = mtod(m, struct icmp *);
226	if (cksum(m, icmplen))
227	{
228	icmpstat.icps_checksum++;
229	goto freeit;
230	}
231	m->m_len += hlen;
232	m->m_data -= hlen;
233
234	/* icmpstat.icps_inhist[icp->icmp_type]++; */
235	/* code = icp->icmp_code; */
236
237	DEBUG_ARG("icmp_type = %d", icp->icmp_type);
238	switch (icp->icmp_type)
239	{
240	case ICMP_ECHO:
241	#ifndef VBOX_WITH_SLIRP_ICMP
242	icp->icmp_type = ICMP_ECHOREPLY;
243	#endif /* !VBOX_WITH_SLIRP_ICMP */
244
245	ip->ip_len += hlen; /* since ip_input subtracts this */
246	dst = ip->ip_dst.s_addr;
247	if (dst == alias_addr.s_addr)
248	{
249	#ifdef VBOX_WITH_SLIRP_ICMP
250	icp->icmp_type = ICMP_ECHOREPLY;
251	ip->ip_dst.s_addr = ip->ip_src.s_addr;
252	ip->ip_src.s_addr = dst;
253	#endif /* VBOX_WITH_SLIRP_ICMP */
254	icmp_reflect(pData, m);
255	}
256	else
257	{
258	struct socket *so;
259	struct sockaddr_in addr;
260	#ifndef VBOX_WITH_SLIRP_ICMP
261	if ((so = socreate()) == NULL)
262	goto freeit;
263	if (udp_attach(pData, so) == -1)
264	{
265	DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
266	errno,strerror(errno)));
267	sofree(pData, so);
268	m_free(pData, m);
269	goto end_error;
270	}
271	so->so_m = m;
272	so->so_faddr = ip->ip_dst;
273	so->so_fport = htons(7);
274	so->so_laddr = ip->ip_src;
275	so->so_lport = htons(9);
276	so->so_iptos = ip->ip_tos;
277	so->so_type = IPPROTO_ICMP;
278	so->so_state = SS_ISFCONNECTED;
279
280	addr.sin_family = AF_INET;
281	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
282	{
283	/* It's an alias */
284	switch (ntohl(so->so_faddr.s_addr) & ~pData->netmask)
285	{
286	case CTL_DNS:
287	addr.sin_addr = dns_addr;
288	break;
289	case CTL_ALIAS:
290	default:
291	addr.sin_addr = loopback_addr;
292	break;
293	}
294	}
295	else
296	addr.sin_addr = so->so_faddr;
297	addr.sin_port = so->so_fport;
298	if (sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
299	(struct sockaddr *)&addr, sizeof(addr)) == -1)
300	{
301	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
302	errno,strerror(errno)));
303	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
304	udp_detach(pData, so);
305	}
306	#else /* VBOX_WITH_SLIRP_ICMP */
307	# ifdef RT_OS_WINDOWS
308	IP_OPTION_INFORMATION ipopt;
309	int error;
310	# endif
311	addr.sin_family = AF_INET;
312	if ((ip->ip_dst.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
313	{
314	/* It's an alias */
315	switch(ntohl(ip->ip_dst.s_addr) & ~pData->netmask)
316	{
317	case CTL_DNS:
318	addr.sin_addr = dns_addr;
319	break;
320	case CTL_ALIAS:
321	default:
322	addr.sin_addr = loopback_addr;
323	break;
324	}
325	}
326	else
327	addr.sin_addr.s_addr = ip->ip_dst.s_addr;
328	icmp_attach(pData, m);
329	/* Send the packet */
330	# ifndef RT_OS_WINDOWS
331	status = setsockopt(pData->icmp_socket.s, IPPROTO_IP, IP_TTL, (void *)&ip->ip_ttl, sizeof(ip->ip_ttl));
332	if (status < 0)
333	{
334	LogRel(("NAT: Error (%s) occurred while setting TTL attribute of IP packet\n", strerror(errno)));
335	}
336	if (sendto(pData->icmp_socket.s, icp, icmplen, 0,
337	(struct sockaddr *)&addr, sizeof(addr)) == -1)
338	{
339	DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
340	errno,strerror(errno)));
341	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
342	m_free(pData, m);
343	}
344	# else /* RT_OS_WINDOWS */
345	pData->icmp_socket.so_laddr.s_addr = ip->ip_src.s_addr; /* XXX: hack*/
346	pData->icmp_socket.so_icmp_id = icp->icmp_id;
347	pData->icmp_socket.so_icmp_seq = icp->icmp_seq;
348	memset(&ipopt, 0, sizeof(IP_OPTION_INFORMATION));
349	ipopt.Ttl = ip->ip_ttl;
350	status = IcmpSendEcho2(pData->icmp_socket.sh, pData->phEvents[VBOX_ICMP_EVENT_INDEX],
351	NULL, NULL, addr.sin_addr.s_addr, icp->icmp_data,
352	icmplen - offsetof(struct icmp, icmp_data) , &ipopt,
353	pData->pvIcmpBuffer, pData->szIcmpBuffer, 0);
354	if (status == 0 && (error = GetLastError()) != ERROR_IO_PENDING)
355	{
356	error = GetLastError();
357	LogRel(("NAT: Error (%d) occurred while sending ICMP (", error));
358	switch (error)
359	{
360	case ERROR_INVALID_PARAMETER:
361	LogRel(("icmp_socket:%lx is invalid)\n", pData->icmp_socket.s));
362	break;
363	case ERROR_NOT_SUPPORTED:
364	LogRel(("operation is unsupported)\n"));
365	break;
366	case ERROR_NOT_ENOUGH_MEMORY:
367	LogRel(("OOM!!!)\n"));
368	break;
369	case IP_BUF_TOO_SMALL:
370	LogRel(("Buffer too small)\n"));
371	break;
372	default:
373	LogRel(("Other error!!!)\n"));
374	break;
375	}
376	}
377	# endif /* RT_OS_WINDOWS */
378	#endif /* VBOX_WITH_SLIRP_ICMP */
379	} /* if ip->ip_dst.s_addr == alias_addr.s_addr */
380	break;
381	case ICMP_UNREACH:
382	/* XXX? report error? close socket? */
383	case ICMP_TIMXCEED:
384	case ICMP_PARAMPROB:
385	case ICMP_SOURCEQUENCH:
386	case ICMP_TSTAMP:
387	case ICMP_MASKREQ:
388	case ICMP_REDIRECT:
389	icmpstat.icps_notsupp++;
390	m_freem(pData, m);
391	break;
392
393	default:
394	icmpstat.icps_badtype++;
395	m_freem(pData, m);
396	} /* switch */
397
398	end_error:
399	/* m is m_free()'d xor put in a socket xor or given to ip_send */
400	;
401	}
402
403
404	/*
405	* Send an ICMP message in response to a situation
406	*
407	* RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
408	* MUST NOT change this header information.
409	* MUST NOT reply to a multicast/broadcast IP address.
410	* MUST NOT reply to a multicast/broadcast MAC address.
411	* MUST reply to only the first fragment.
412	*/
413	/*
414	* Send ICMP_UNREACH back to the source regarding msrc.
415	* mbuf *msrc is used as a template, but is NOT m_free()'d.
416	* It is reported as the bad ip packet. The header should
417	* be fully correct and in host byte order.
418	* ICMP fragmentation is illegal. All machines must accept 576 bytes in one
419	* packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
420	*/
421
422	#define ICMP_MAXDATALEN (IP_MSS-28)
423	void icmp_error(PNATState pData, struct mbuf msrc, u_char type, u_char code, int minsize, char message)
424	{
425	unsigned hlen, shlen, s_ip_len;
426	register struct ip *ip;
427	register struct icmp *icp;
428	register struct mbuf *m;
429
430	DEBUG_CALL("icmp_error");
431	DEBUG_ARG("msrc = %lx", (long )msrc);
432	DEBUG_ARG("msrc_len = %d", msrc->m_len);
433
434	if (type!=ICMP_UNREACH && type!=ICMP_TIMXCEED)
435	goto end_error;
436
437	/* check msrc */
438	if (!msrc)
439	goto end_error;
440
441	ip = mtod(msrc, struct ip *);
442	#if DEBUG
443	{
444	char bufa[20], bufb[20];
445	strcpy(bufa, inet_ntoa(ip->ip_src));
446	strcpy(bufb, inet_ntoa(ip->ip_dst));
447	DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
448	}
449	#endif
450	if (ip->ip_off & IP_OFFMASK)
451	goto end_error; /* Only reply to fragment 0 */
452
453	shlen=ip->ip_hl << 2;
454	s_ip_len=ip->ip_len;
455	if (ip->ip_p == IPPROTO_ICMP)
456	{
457	icp = (struct icmp )((char )ip + shlen);
458	/*
459	* Assume any unknown ICMP type is an error. This isn't
460	* specified by the RFC, but think about it..
461	*/
462	if (icp->icmp_type>18 \|\| icmp_flush[icp->icmp_type])
463	goto end_error;
464	}
465
466	/* make a copy */
467	if (!(m=m_get(pData)))
468	goto end_error; /* get mbuf */
469	{
470	int new_m_size;
471	new_m_size = sizeof(struct ip) + ICMP_MINLEN + msrc->m_len + ICMP_MAXDATALEN;
472	if (new_m_size>m->m_size)
473	m_inc(m, new_m_size);
474	}
475	memcpy(m->m_data, msrc->m_data, msrc->m_len);
476	m->m_len = msrc->m_len; /* copy msrc to m */
477
478	/* make the header of the reply packet */
479	ip = mtod(m, struct ip *);
480	hlen = sizeof(struct ip ); /* no options in reply */
481
482	/* fill in icmp */
483	m->m_data += hlen;
484	m->m_len -= hlen;
485
486	icp = mtod(m, struct icmp *);
487
488	if (minsize)
489	s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
490	else if (s_ip_len>ICMP_MAXDATALEN) /* maximum size */
491	s_ip_len=ICMP_MAXDATALEN;
492
493	m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
494
495	/* min. size = 8+sizeof(struct ip)+8 */
496
497	icp->icmp_type = type;
498	icp->icmp_code = code;
499	icp->icmp_id = 0;
500	icp->icmp_seq = 0;
501
502	memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
503	HTONS(icp->icmp_ip.ip_len);
504	HTONS(icp->icmp_ip.ip_id);
505	HTONS(icp->icmp_ip.ip_off);
506
507	#if DEBUG
508	if (message)
509	{
510	/* DEBUG : append message to ICMP packet */
511	int message_len;
512	char *cpnt;
513	message_len=strlen(message);
514	if (message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
515	cpnt=(char *)m->m_data+m->m_len;
516	memcpy(cpnt, message, message_len);
517	m->m_len+=message_len;
518	}
519	#endif
520
521	icp->icmp_cksum = 0;
522	icp->icmp_cksum = cksum(m, m->m_len);
523
524	m->m_data -= hlen;
525	m->m_len += hlen;
526
527	/* fill in ip */
528	ip->ip_hl = hlen >> 2;
529	ip->ip_len = m->m_len;
530
531	ip->ip_tos=((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
532
533	ip->ip_ttl = MAXTTL;
534	ip->ip_p = IPPROTO_ICMP;
535	ip->ip_dst = ip->ip_src; /* ip adresses */
536	ip->ip_src = alias_addr;
537
538	(void ) ip_output(pData, (struct socket *)NULL, m);
539
540	icmpstat.icps_reflect++;
541
542	end_error:
543	;
544	}
545	#undef ICMP_MAXDATALEN
546
547	/*
548	* Reflect the ip packet back to the source
549	*/
550	void
551	icmp_reflect(PNATState pData, struct mbuf *m)
552	{
553	register struct ip ip = mtod(m, struct ip );
554	int hlen = ip->ip_hl << 2;
555	int optlen = hlen - sizeof(struct ip );
556	register struct icmp *icp;
557
558	/*
559	* Send an icmp packet back to the ip level,
560	* after supplying a checksum.
561	*/
562	m->m_data += hlen;
563	m->m_len -= hlen;
564	icp = mtod(m, struct icmp *);
565
566	icp->icmp_cksum = 0;
567	icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
568
569	m->m_data -= hlen;
570	m->m_len += hlen;
571
572	#ifndef VBOX_WITH_SLIRP_ICMP
573	/* fill in ip */
574	if (optlen > 0)
575	{
576	/*
577	* Strip out original options by copying rest of first
578	* mbuf's data back, and adjust the IP length.
579	*/
580	memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
581	(unsigned )(m->m_len - hlen));
582	hlen -= optlen;
583	ip->ip_hl = hlen >> 2;
584	ip->ip_len -= optlen;
585	m->m_len -= optlen;
586	}
587	ip->ip_ttl = MAXTTL;
588	{
589	/* swap */
590	struct in_addr icmp_dst;
591	icmp_dst = ip->ip_dst;
592	ip->ip_dst = ip->ip_src;
593	ip->ip_src = icmp_dst;
594	}
595	#endif /* !VBOX_WITH_SLIRP_ICMP */
596
597	(void ) ip_output(pData, (struct socket *)NULL, m);
598
599	icmpstat.icps_reflect++;
600	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/ip_icmp.c@ 15223

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