udp.c@ 41967

Last change on this file since 41967 was 41856, checked in by vboxsync, 13 years ago
NAT: typo.
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1	/* $Id: udp.c 41856 2012-06-21 06:00:24Z vboxsync $ */
2	/** @file
3	* NAT - UDP protocol.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*
19	* This code is based on:
20	*
21	* Copyright (c) 1982, 1986, 1988, 1990, 1993
22	* The Regents of the University of California. All rights reserved.
23	*
24	* Redistribution and use in source and binary forms, with or without
25	* modification, are permitted provided that the following conditions
26	* are met:
27	* 1. Redistributions of source code must retain the above copyright
28	* notice, this list of conditions and the following disclaimer.
29	* 2. Redistributions in binary form must reproduce the above copyright
30	* notice, this list of conditions and the following disclaimer in the
31	* documentation and/or other materials provided with the distribution.
32	* 3. All advertising materials mentioning features or use of this software
33	* must display the following acknowledgement:
34	* This product includes software developed by the University of
35	* California, Berkeley and its contributors.
36	* 4. Neither the name of the University nor the names of its contributors
37	* may be used to endorse or promote products derived from this software
38	* without specific prior written permission.
39	*
40	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
41	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
44	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50	* SUCH DAMAGE.
51	*
52	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
53	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
54	*/
55
56	/*
57	* Changes and additions relating to SLiRP
58	* Copyright (c) 1995 Danny Gasparovski.
59	*
60	* Please read the file COPYRIGHT for the
61	* terms and conditions of the copyright.
62	*/
63
64	#include <slirp.h>
65	#include "ip_icmp.h"
66	#include "ctl.h"
67
68
69	/*
70	* UDP protocol implementation.
71	* Per RFC 768, August, 1980.
72	*/
73	#define udpcksum 1
74
75	void
76	udp_init(PNATState pData)
77	{
78	udp_last_so = &udb;
79	udb.so_next = udb.so_prev = &udb;
80	}
81
82	/* m->m_data points at ip packet header
83	* m->m_len length ip packet
84	* ip->ip_len length data (IPDU)
85	*/
86	void
87	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
88	{
89	register struct ip *ip;
90	register struct udphdr *uh;
91	int len;
92	struct ip save_ip;
93	struct socket *so;
94	int ret;
95	int ttl;
96
97	LogFlowFunc(("ENTER: m = %p, iphlen = %d\n", m, iphlen));
98	ip = mtod(m, struct ip *);
99	Log2(("%RTnaipv4 iphlen = %d\n", ip->ip_dst, iphlen));
100
101	udpstat.udps_ipackets++;
102
103	/*
104	* Strip IP options, if any; should skip this,
105	* make available to user, and use on returned packets,
106	* but we don't yet have a way to check the checksum
107	* with options still present.
108	*/
109	if (iphlen > sizeof(struct ip))
110	{
111	ip_stripoptions(m, (struct mbuf *)0);
112	iphlen = sizeof(struct ip);
113	}
114
115	/*
116	* Get IP and UDP header together in first mbuf.
117	*/
118	ip = mtod(m, struct ip *);
119	uh = (struct udphdr *)((caddr_t)ip + iphlen);
120
121	/*
122	* Make mbuf data length reflect UDP length.
123	* If not enough data to reflect UDP length, drop.
124	*/
125	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
126	Assert((ip->ip_len == len));
127	Assert((ip->ip_len + iphlen == m_length(m, NULL)));
128
129	if (ip->ip_len != len)
130	{
131	if (len > ip->ip_len)
132	{
133	udpstat.udps_badlen++;
134	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
135	}
136	m_adj(m, len - ip->ip_len);
137	ip->ip_len = len;
138	}
139
140	/*
141	* Save a copy of the IP header in case we want restore it
142	* for sending an ICMP error message in response.
143	*/
144	save_ip = *ip;
145	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
146
147	/*
148	* Checksum extended UDP header and data.
149	*/
150	if (udpcksum && uh->uh_sum)
151	{
152	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
153	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
154	#if 0
155	/* keep uh_sum for ICMP reply */
156	uh->uh_sum = cksum(m, len + sizeof (struct ip));
157	if (uh->uh_sum)
158	{
159
160	#endif
161	if (cksum(m, len + iphlen))
162	{
163	udpstat.udps_badsum++;
164	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
165	goto bad_free_mbuf;
166	}
167	}
168	#if 0
169	}
170	#endif
171
172	/*
173	* handle DHCP/BOOTP
174	*/
175	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
176	{
177	bootp_input(pData, m);
178	goto done_free_mbuf;
179	}
180
181	LogFunc(("uh src: %RTnaipv4:%d, dst: %RTnaipv4:%d\n", ip->ip_src, RT_H2N_U16_C(uh->uh_sport), ip->ip_dst, RT_H2N_U16_C(uh->uh_dport)));
182	if ( pData->fUseHostResolver
183	&& uh->uh_dport == RT_H2N_U16_C(53)
184	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS))
185	{
186	struct sockaddr_in dst, src;
187	src.sin_addr.s_addr = ip->ip_dst.s_addr;
188	src.sin_port = uh->uh_dport;
189	dst.sin_addr.s_addr = ip->ip_src.s_addr;
190	dst.sin_port = uh->uh_sport;
191
192	slirpMbufTagService(pData, m, CTL_DNS);
193	/* udp_output2() expects a pointer to the body of UDP packet. */
194	m->m_data += sizeof(struct udpiphdr);
195	m->m_len -= sizeof(struct udpiphdr);
196	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
197	LogFlowFuncLeave();
198	return;
199	}
200	/*
201	* handle TFTP
202	*/
203	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
204	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_TFTP))
205	{
206	tftp_input(pData, m);
207	goto done_free_mbuf;
208	}
209
210	/*
211	* Locate pcb for datagram.
212	*/
213	so = udp_last_so;
214	if ( so->so_lport != uh->uh_sport
215	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
216	{
217	struct socket *tmp;
218
219	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
220	{
221	if ( tmp->so_lport == uh->uh_sport
222	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
223	{
224	so = tmp;
225	break;
226	}
227	}
228	if (tmp == &udb)
229	so = NULL;
230	else
231	{
232	udpstat.udpps_pcbcachemiss++;
233	udp_last_so = so;
234	}
235	}
236
237	if (so == NULL)
238	{
239	/*
240	* If there's no socket for this packet,
241	* create one
242	*/
243	if ((so = socreate()) == NULL)
244	{
245	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
246	goto bad_free_mbuf;
247	}
248	if (udp_attach(pData, so) <= 0)
249	{
250	Log2(("NAT: IP(id: %hd) udp_attach errno = %d (%s)\n",
251	ip->ip_id, errno, strerror(errno)));
252	sofree(pData, so);
253	goto bad_free_mbuf;
254	}
255
256	/*
257	* Setup fields
258	*/
259	/* udp_last_so = so; */
260	so->so_laddr = ip->ip_src;
261	so->so_lport = uh->uh_sport;
262
263	so->so_iptos = ip->ip_tos;
264
265	/*
266	* XXXXX Here, check if it's in udpexec_list,
267	* and if it is, do the fork_exec() etc.
268	*/
269	}
270
271	so->so_faddr = ip->ip_dst; /* XXX */
272	so->so_fport = uh->uh_dport; /* XXX */
273	Assert(so->so_type == IPPROTO_UDP);
274
275	/*
276	* DNS proxy
277	*/
278	if ( pData->fUseDnsProxy
279	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
280	&& (uh->uh_dport == RT_H2N_U16_C(53)))
281	{
282	dnsproxy_query(pData, so, m, iphlen);
283	goto done_free_mbuf;
284	}
285
286	iphlen += sizeof(struct udphdr);
287	m->m_len -= iphlen;
288	m->m_data += iphlen;
289
290	ttl = ip->ip_ttl = save_ip.ip_ttl;
291	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
292	if (ret < 0)
293	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
294	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
295
296	if ( sosendto(pData, so, m) == -1
297	&& ( !soIgnorableErrorCode(errno)
298	&& errno != ENOTCONN))
299	{
300	m->m_len += iphlen;
301	m->m_data -= iphlen;
302	*ip = save_ip;
303	Log2(("NAT: UDP tx errno = %d (%s) on sent to %RTnaipv4\n",
304	errno, strerror(errno), ip->ip_dst));
305	#if 0
306	/* ICMP_SOURCEQUENCH haven't got any effect, the idea here
307	* inform guest about the exosting NAT resources with assumption that
308	* that guest reduce traffic. But it doesn't work
309	*/
310	if( errno == EAGAIN
311	\|\| errno == EWOULDBLOCK
312	\|\| errno == EINPROGRESS
313	\|\| errno == ENOTCONN)
314	icmp_error(pData, m, ICMP_SOURCEQUENCH, 0, 1, strerror(errno));
315	else
316	#endif
317	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
318	so->so_m = NULL;
319	LogFlowFuncLeave();
320	return;
321	}
322
323	if (so->so_m)
324	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
325
326	/* restore the orig mbuf packet */
327	m->m_len += iphlen;
328	m->m_data -= iphlen;
329	*ip = save_ip;
330	so->so_m = m; /* ICMP backup */
331	LogFlowFuncLeave();
332	return;
333
334	bad_free_mbuf:
335	Log2(("NAT: UDP(id: %hd) datagram to %RTnaipv4 with size(%d) claimed as bad\n",
336	ip->ip_id, &ip->ip_dst, ip->ip_len));
337
338	done_free_mbuf:
339	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
340	* and create new m'buffers to send them to guest, so we'll free their incomming
341	* buffers here.
342	*/
343	m_freem(pData, m);
344	LogFlowFuncLeave();
345	return;
346	}
347
348	/**
349	* Output a UDP packet.
350	*
351	* @note This function will finally free m!
352	*/
353	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
354	struct sockaddr_in saddr, struct sockaddr_in daddr,
355	int iptos)
356	{
357	register struct udpiphdr *ui;
358	int error;
359	int mlen = 0;
360
361	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4, daddr = %RTnaipv4\n",
362	so, m, saddr->sin_addr.s_addr, daddr->sin_addr.s_addr));
363
364	/* in case of built-in service so might be NULL */
365	if (so) Assert(so->so_type == IPPROTO_UDP);
366
367	/*
368	* Adjust for header
369	*/
370	m->m_data -= sizeof(struct udpiphdr);
371	m->m_len += sizeof(struct udpiphdr);
372	mlen = m_length(m, NULL);
373
374	/*
375	* Fill in mbuf with extended UDP header
376	* and addresses and length put into network format.
377	*/
378	ui = mtod(m, struct udpiphdr *);
379	memset(ui->ui_x1, 0, 9);
380	ui->ui_pr = IPPROTO_UDP;
381	ui->ui_len = RT_H2N_U16(mlen - sizeof(struct ip));
382	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
383	ui->ui_src = saddr->sin_addr;
384	ui->ui_dst = daddr->sin_addr;
385	ui->ui_sport = saddr->sin_port;
386	ui->ui_dport = daddr->sin_port;
387	ui->ui_ulen = ui->ui_len;
388
389	/*
390	* Stuff checksum and output datagram.
391	*/
392	ui->ui_sum = 0;
393	if (udpcksum)
394	{
395	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ mlen)) == 0)
396	ui->ui_sum = 0xffff;
397	}
398	((struct ip *)ui)->ip_len = mlen;
399	((struct ip *)ui)->ip_ttl = ip_defttl;
400	((struct ip *)ui)->ip_tos = iptos;
401
402	udpstat.udps_opackets++;
403
404	error = ip_output(pData, so, m);
405
406	return error;
407	}
408
409	/**
410	* @note This function will free m!
411	*/
412	int udp_output(PNATState pData, struct socket so, struct mbuf m,
413	struct sockaddr_in *addr)
414	{
415	struct sockaddr_in saddr, daddr;
416	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
417	struct socket *pSocketClone = NULL;
418	#endif
419	Assert(so->so_type == IPPROTO_UDP);
420	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4\n",
421	so, (long)m, addr->sin_addr.s_addr));
422
423	saddr = *addr;
424	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
425	{
426	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
427	if (slirpIsWideCasting(pData, so->so_faddr.s_addr))
428	{
429	/**
430	* We haven't got real firewall but have got its submodule libalias.
431	*/
432	m->m_flags \|= M_SKIP_FIREWALL;
433	/**
434	* udp/137 port is Name Service in NetBIOS protocol. for some reasons Windows guest rejects
435	* accept data from non-aliased server.
436	*/
437	if ( (so->so_fport == so->so_lport)
438	&& (so->so_fport == RT_H2N_U16(137)))
439	saddr.sin_addr.s_addr = alias_addr.s_addr;
440	else
441	saddr.sin_addr.s_addr = addr->sin_addr.s_addr;
442	/* we shouldn't override initial socket */
443	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
444	if (so->so_cCloneCounter)
445	pSocketClone = soLookUpClonedUDPSocket(pData, so, addr->sin_addr.s_addr);
446	if (!pSocketClone)
447	pSocketClone = soCloneUDPSocketWithForegnAddr(pData, false, so, addr->sin_addr.s_addr);
448	Assert((pSocketClone));
449	so = pSocketClone;
450	#else
451	so->so_faddr.s_addr = addr->sin_addr.s_addr;
452	#endif
453	}
454	}
455
456	/* Any UDP packet to the loopback address must be translated to be from
457	* the forwarding address, i.e. 10.0.2.2. */
458	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
459	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
460	saddr.sin_addr.s_addr = alias_addr.s_addr;
461
462	daddr.sin_addr = so->so_laddr;
463	daddr.sin_port = so->so_lport;
464
465	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
466	}
467
468	int
469	udp_attach(PNATState pData, struct socket *so)
470	{
471	struct sockaddr_in *addr;
472	struct sockaddr sa_addr;
473	socklen_t socklen = sizeof(struct sockaddr);
474	int status;
475	int opt = 1;
476
477	/* We attaching some olready attched socket ??? */
478	Assert(so->so_type == 0);
479	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
480	goto error;
481	/*
482	* Here, we bind() the socket. Although not really needed
483	* (sendto() on an unbound socket will bind it), it's done
484	* here so that emulation of ytalk etc. don't have to do it
485	*/
486	memset(&sa_addr, 0, sizeof(struct sockaddr));
487	addr = (struct sockaddr_in *)&sa_addr;
488	#ifdef RT_OS_DARWIN
489	addr->sin_len = sizeof(struct sockaddr_in);
490	#endif
491	addr->sin_family = AF_INET;
492	addr->sin_addr.s_addr = pData->bindIP.s_addr;
493	fd_nonblock(so->s);
494	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
495	{
496	int lasterrno = errno;
497	closesocket(so->s);
498	so->s = -1;
499	#ifdef RT_OS_WINDOWS
500	WSASetLastError(lasterrno);
501	#else
502	errno = lasterrno;
503	#endif
504	goto error;
505	}
506	/* success, insert in queue */
507	so->so_expire = curtime + SO_EXPIRE;
508	/* enable broadcast for later use */
509	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
510	status = getsockname(so->s, &sa_addr, &socklen);
511	Assert(status == 0 && sa_addr.sa_family == AF_INET);
512	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
513	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
514
515	SOCKET_LOCK_CREATE(so);
516	QSOCKET_LOCK(udb);
517	insque(pData, so, &udb);
518	NSOCK_INC();
519	QSOCKET_UNLOCK(udb);
520	so->so_type = IPPROTO_UDP;
521	return so->s;
522	error:
523	Log2(("NAT: can't create datagramm socket\n"));
524	return -1;
525	}
526
527	void
528	udp_detach(PNATState pData, struct socket *so)
529	{
530	if (so != &pData->icmp_socket)
531	{
532	Assert(so->so_type == IPPROTO_UDP);
533	QSOCKET_LOCK(udb);
534	SOCKET_LOCK(so);
535	QSOCKET_UNLOCK(udb);
536	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
537	if (so->so_cloneOf)
538	so->so_cloneOf->so_cCloneCounter--;
539	else if (so->so_cCloneCounter > 0)
540	{
541	/* we can't close socket yet */
542	SOCKET_UNLOCK(so);
543	return;
544	}
545	#endif
546	closesocket(so->s);
547	sofree(pData, so);
548	SOCKET_UNLOCK(so);
549	}
550	}
551
552	struct socket *
553	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
554	{
555	struct sockaddr_in addr;
556	struct socket *so;
557	socklen_t addrlen = sizeof(struct sockaddr_in);
558	int opt = 1;
559	LogFlowFunc(("ENTER: bind_addr:%RTnaipv4, port:%d, laddr:%RTnaipv4, lport:%d, flags:%x\n",
560	bind_addr, RT_N2H_U16(port), laddr, RT_N2H_U16(lport), flags));
561
562	if ((so = socreate()) == NULL)
563	{
564	LogFlowFunc(("LEAVE: NULL\n"));
565	return NULL;
566	}
567
568	so->s = socket(AF_INET, SOCK_DGRAM, 0);
569	if (so->s == -1)
570	{
571	LogRel(("NAT: can't create datagram socket\n"));
572	RTMemFree(so);
573	LogFlowFunc(("LEAVE: NULL\n"));
574	return NULL;
575	}
576	so->so_expire = curtime + SO_EXPIRE;
577	so->so_type = IPPROTO_UDP;
578	fd_nonblock(so->s);
579	SOCKET_LOCK_CREATE(so);
580	QSOCKET_LOCK(udb);
581	insque(pData, so, &udb);
582	NSOCK_INC();
583	QSOCKET_UNLOCK(udb);
584
585	memset(&addr, 0, sizeof(addr));
586	#ifdef RT_OS_DARWIN
587	addr.sin_len = sizeof(addr);
588	#endif
589	addr.sin_family = AF_INET;
590	addr.sin_addr.s_addr = bind_addr;
591	addr.sin_port = port;
592
593	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
594	{
595	LogRel(("NAT: bind to %RTnaipv4 has been failed\n", addr.sin_addr));
596	udp_detach(pData, so);
597	LogFlowFunc(("LEAVE: NULL\n"));
598	return NULL;
599	}
600	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
601	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
602
603	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
604	so->so_fport = addr.sin_port;
605	/* The original check was completely broken, as the commented out
606	* if statement was always true (INADDR_ANY=0). */
607	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
608	/* @todo: vvl - alias_addr should be set (if required)
609	* later by liabalias module.
610	*/
611	if (1 == 0) /* always use the else part */
612	so->so_faddr = alias_addr;
613	else
614	so->so_faddr = addr.sin_addr;
615
616	so->so_lport = lport;
617	so->so_laddr.s_addr = laddr;
618	if (flags != SS_FACCEPTONCE)
619	so->so_expire = 0;
620
621	so->so_state = SS_ISFCONNECTED;
622
623	LogFlowFunc(("LEAVE: %R[natsock]\n", so));
624	return so;
625	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 41967

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