udp.c@ 55192

Last change on this file since 55192 was 55003, checked in by vboxsync, 10 years ago
NAT: udp_input: force allocation of new socket for requests to the DNS proxy since DNS proxy code is currently limited to tracking just one request per socket.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 19.9 KB

Line
1	/* $Id: udp.c 55003 2015-03-30 02:21:45Z vboxsync $ */
2	/** @file
3	* NAT - UDP protocol.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 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, tos;
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 + iphlen == m_length(m, NULL)));
127
128	if (ip->ip_len != len)
129	{
130	if (len > ip->ip_len)
131	{
132	udpstat.udps_badlen++;
133	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
134	goto bad_free_mbuf;
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	if (pData->pvTftpSessions)
207	slirpTftpInput(pData, m);
208	goto done_free_mbuf;
209	}
210
211	/*
212	* XXX: DNS proxy currently relies on the fact that each socket
213	* only serves one request.
214	*/
215	if ( pData->fUseDnsProxy
216	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS)
217	&& (uh->uh_dport == RT_H2N_U16_C(53)))
218	{
219	so = NULL;
220	goto new_socket;
221	}
222
223	/*
224	* Locate pcb for datagram.
225	*/
226	so = udp_last_so;
227	if ( so->so_lport != uh->uh_sport
228	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
229	{
230	struct socket *tmp;
231
232	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
233	{
234	if ( tmp->so_lport == uh->uh_sport
235	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
236	{
237	so = tmp;
238	break;
239	}
240	}
241	if (tmp == &udb)
242	so = NULL;
243	else
244	{
245	udpstat.udpps_pcbcachemiss++;
246	udp_last_so = so;
247	}
248	}
249
250	new_socket:
251	if (so == NULL)
252	{
253	/*
254	* If there's no socket for this packet,
255	* create one
256	*/
257	if ((so = socreate()) == NULL)
258	{
259	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
260	goto bad_free_mbuf;
261	}
262	if (udp_attach(pData, so) <= 0)
263	{
264	Log2(("NAT: IP(id: %hd) udp_attach errno = %d (%s)\n",
265	ip->ip_id, errno, strerror(errno)));
266	sofree(pData, so);
267	goto bad_free_mbuf;
268	}
269
270	/*
271	* Setup fields
272	*/
273	/* udp_last_so = so; */
274	so->so_laddr = ip->ip_src;
275	so->so_lport = uh->uh_sport;
276
277	so->so_iptos = ip->ip_tos;
278
279	/*
280	* XXXXX Here, check if it's in udpexec_list,
281	* and if it is, do the fork_exec() etc.
282	*/
283	}
284
285	so->so_faddr = ip->ip_dst; /* XXX */
286	so->so_fport = uh->uh_dport; /* XXX */
287	Assert(so->so_type == IPPROTO_UDP);
288
289	/*
290	* DNS proxy
291	*/
292	if ( pData->fUseDnsProxy
293	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS)
294	&& (uh->uh_dport == RT_H2N_U16_C(53)))
295	{
296	dnsproxy_query(pData, so, m, iphlen);
297	goto done_free_mbuf;
298	}
299
300	iphlen += sizeof(struct udphdr);
301	m->m_len -= iphlen;
302	m->m_data += iphlen;
303
304	ttl = ip->ip_ttl = save_ip.ip_ttl;
305	if (ttl != so->so_sottl) {
306	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL,
307	(char *)&ttl, sizeof(ttl));
308	if (RT_LIKELY(ret == 0))
309	so->so_sottl = ttl;
310	}
311
312	tos = save_ip.ip_tos;
313	if (tos != so->so_sotos) {
314	ret = setsockopt(so->s, IPPROTO_IP, IP_TOS,
315	(char *)&tos, sizeof(tos));
316	if (RT_LIKELY(ret == 0))
317	so->so_sotos = tos;
318	}
319
320	{
321	/*
322	* Different OSes have different socket options for DF. We
323	* can't use IP_HDRINCL here as it's only valid for SOCK_RAW.
324	*/
325	# define USE_DF_OPTION(_Optname) \
326	const int dfopt = _Optname; \
327	const char * const dfoptname = #_Optname;
328	#if defined(IP_MTU_DISCOVER)
329	USE_DF_OPTION(IP_MTU_DISCOVER);
330	#elif defined(IP_DONTFRAG) /* Solaris 11+, FreeBSD */
331	USE_DF_OPTION(IP_DONTFRAG);
332	#elif defined(IP_DONTFRAGMENT) /* Windows */
333	USE_DF_OPTION(IP_DONTFRAGMENT);
334	#else
335	USE_DF_OPTION(0);
336	#endif
337	if (dfopt) {
338	int df = (save_ip.ip_off & IP_DF) != 0;
339	#if defined(IP_MTU_DISCOVER)
340	df = df ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
341	#endif
342	if (df != so->so_sodf) {
343	ret = setsockopt(so->s, IPPROTO_IP, dfopt,
344	(char *)&df, sizeof(df));
345	if (RT_LIKELY(ret == 0))
346	so->so_sodf = df;
347	}
348	}
349	}
350
351	if ( sosendto(pData, so, m) == -1
352	&& ( !soIgnorableErrorCode(errno)
353	&& errno != ENOTCONN))
354	{
355	m->m_len += iphlen;
356	m->m_data -= iphlen;
357	*ip = save_ip;
358	Log2(("NAT: UDP tx errno = %d (%s) on sent to %RTnaipv4\n",
359	errno, strerror(errno), ip->ip_dst));
360	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
361	so->so_m = NULL;
362	LogFlowFuncLeave();
363	return;
364	}
365
366	if (so->so_m)
367	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
368
369	/* restore the orig mbuf packet */
370	m->m_len += iphlen;
371	m->m_data -= iphlen;
372	*ip = save_ip;
373	so->so_m = m; /* ICMP backup */
374	LogFlowFuncLeave();
375	return;
376
377	bad_free_mbuf:
378	Log2(("NAT: UDP(id: %hd) datagram to %RTnaipv4 with size(%d) claimed as bad\n",
379	ip->ip_id, &ip->ip_dst, ip->ip_len));
380
381	done_free_mbuf:
382	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
383	* and create new m'buffers to send them to guest, so we'll free their incomming
384	* buffers here.
385	*/
386	m_freem(pData, m);
387	LogFlowFuncLeave();
388	return;
389	}
390
391	/**
392	* Output a UDP packet.
393	*
394	* @note This function will finally free m!
395	*/
396	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
397	struct sockaddr_in saddr, struct sockaddr_in daddr,
398	int iptos)
399	{
400	register struct udpiphdr *ui;
401	int error;
402	int mlen = 0;
403
404	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4, daddr = %RTnaipv4\n",
405	so, m, saddr->sin_addr.s_addr, daddr->sin_addr.s_addr));
406
407	/* in case of built-in service so might be NULL */
408	if (so) Assert(so->so_type == IPPROTO_UDP);
409
410	/*
411	* Adjust for header
412	*/
413	m->m_data -= sizeof(struct udpiphdr);
414	m->m_len += sizeof(struct udpiphdr);
415	mlen = m_length(m, NULL);
416
417	/*
418	* Fill in mbuf with extended UDP header
419	* and addresses and length put into network format.
420	*/
421	ui = mtod(m, struct udpiphdr *);
422	memset(ui->ui_x1, 0, 9);
423	ui->ui_pr = IPPROTO_UDP;
424	ui->ui_len = RT_H2N_U16(mlen - sizeof(struct ip));
425	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
426	ui->ui_src = saddr->sin_addr;
427	ui->ui_dst = daddr->sin_addr;
428	ui->ui_sport = saddr->sin_port;
429	ui->ui_dport = daddr->sin_port;
430	ui->ui_ulen = ui->ui_len;
431
432	/*
433	* Stuff checksum and output datagram.
434	*/
435	ui->ui_sum = 0;
436	if (udpcksum)
437	{
438	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ mlen)) == 0)
439	ui->ui_sum = 0xffff;
440	}
441	((struct ip *)ui)->ip_len = mlen;
442	((struct ip *)ui)->ip_ttl = ip_defttl;
443	((struct ip *)ui)->ip_tos = iptos;
444
445	udpstat.udps_opackets++;
446
447	error = ip_output(pData, so, m);
448
449	return error;
450	}
451
452	/**
453	* @note This function will free m!
454	*/
455	int udp_output(PNATState pData, struct socket so, struct mbuf m,
456	struct sockaddr_in *addr)
457	{
458	struct sockaddr_in saddr, daddr;
459	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
460	struct socket *pSocketClone = NULL;
461	#endif
462	Assert(so->so_type == IPPROTO_UDP);
463	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4\n",
464	so, (long)m, addr->sin_addr.s_addr));
465
466	saddr = *addr;
467	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
468	{
469	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
470	if (slirpIsWideCasting(pData, so->so_faddr.s_addr))
471	{
472	/**
473	* We haven't got real firewall but have got its submodule libalias.
474	*/
475	m->m_flags \|= M_SKIP_FIREWALL;
476	/**
477	* udp/137 port is Name Service in NetBIOS protocol. for some reasons Windows guest rejects
478	* accept data from non-aliased server.
479	*/
480	if ( (so->so_fport == so->so_lport)
481	&& (so->so_fport == RT_H2N_U16(137)))
482	saddr.sin_addr.s_addr = alias_addr.s_addr;
483	else
484	saddr.sin_addr.s_addr = addr->sin_addr.s_addr;
485	/* we shouldn't override initial socket */
486	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
487	if (so->so_cCloneCounter)
488	pSocketClone = soLookUpClonedUDPSocket(pData, so, addr->sin_addr.s_addr);
489	if (!pSocketClone)
490	pSocketClone = soCloneUDPSocketWithForegnAddr(pData, false, so, addr->sin_addr.s_addr);
491	Assert((pSocketClone));
492	so = pSocketClone;
493	#else
494	so->so_faddr.s_addr = addr->sin_addr.s_addr;
495	#endif
496	}
497	}
498
499	/* Any UDP packet to the loopback address must be translated to be from
500	* the forwarding address, i.e. 10.0.2.2. */
501	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
502	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
503	saddr.sin_addr.s_addr = alias_addr.s_addr;
504
505	daddr.sin_addr = so->so_laddr;
506	daddr.sin_port = so->so_lport;
507
508	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
509	}
510
511	int
512	udp_attach(PNATState pData, struct socket *so)
513	{
514	struct sockaddr_in *addr;
515	struct sockaddr sa_addr;
516	socklen_t socklen = sizeof(struct sockaddr);
517	int status;
518	int opt = 1;
519
520	/* We attaching some olready attched socket ??? */
521	Assert(so->so_type == 0);
522	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
523	goto error;
524	so->so_sottl = 0;
525	so->so_sotos = 0;
526	so->so_sodf = -1;
527	/*
528	* Here, we bind() the socket. Although not really needed
529	* (sendto() on an unbound socket will bind it), it's done
530	* here so that emulation of ytalk etc. don't have to do it
531	*/
532	memset(&sa_addr, 0, sizeof(struct sockaddr));
533	addr = (struct sockaddr_in *)&sa_addr;
534	#ifdef RT_OS_DARWIN
535	addr->sin_len = sizeof(struct sockaddr_in);
536	#endif
537	addr->sin_family = AF_INET;
538	addr->sin_addr.s_addr = pData->bindIP.s_addr;
539	fd_nonblock(so->s);
540	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
541	{
542	int lasterrno = errno;
543	closesocket(so->s);
544	so->s = -1;
545	#ifdef RT_OS_WINDOWS
546	WSASetLastError(lasterrno);
547	#else
548	errno = lasterrno;
549	#endif
550	goto error;
551	}
552	/* success, insert in queue */
553	so->so_expire = curtime + SO_EXPIRE;
554	/* enable broadcast for later use */
555	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
556	status = getsockname(so->s, &sa_addr, &socklen);
557	Assert(status == 0 && sa_addr.sa_family == AF_INET);
558	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
559	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
560
561	SOCKET_LOCK_CREATE(so);
562	QSOCKET_LOCK(udb);
563	insque(pData, so, &udb);
564	NSOCK_INC();
565	QSOCKET_UNLOCK(udb);
566	so->so_type = IPPROTO_UDP;
567	return so->s;
568	error:
569	Log2(("NAT: can't create datagramm socket\n"));
570	return -1;
571	}
572
573	void
574	udp_detach(PNATState pData, struct socket *so)
575	{
576	if (so != &pData->icmp_socket)
577	{
578	Assert(so->so_type == IPPROTO_UDP);
579	QSOCKET_LOCK(udb);
580	SOCKET_LOCK(so);
581	QSOCKET_UNLOCK(udb);
582	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
583	if (so->so_cloneOf)
584	so->so_cloneOf->so_cCloneCounter--;
585	else if (so->so_cCloneCounter > 0)
586	{
587	/* we can't close socket yet */
588	SOCKET_UNLOCK(so);
589	return;
590	}
591	#endif
592	closesocket(so->s);
593	sofree(pData, so);
594	SOCKET_UNLOCK(so);
595	}
596	}
597
598	struct socket *
599	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
600	{
601	struct sockaddr_in addr;
602	struct socket *so;
603	socklen_t addrlen = sizeof(struct sockaddr_in);
604	int opt = 1;
605	LogFlowFunc(("ENTER: bind_addr:%RTnaipv4, port:%d, laddr:%RTnaipv4, lport:%d, flags:%x\n",
606	bind_addr, RT_N2H_U16(port), laddr, RT_N2H_U16(lport), flags));
607
608	if ((so = socreate()) == NULL)
609	{
610	LogFlowFunc(("LEAVE: NULL\n"));
611	return NULL;
612	}
613
614	so->s = socket(AF_INET, SOCK_DGRAM, 0);
615	if (so->s == -1)
616	{
617	LogRel(("NAT: can't create datagram socket\n"));
618	RTMemFree(so);
619	LogFlowFunc(("LEAVE: NULL\n"));
620	return NULL;
621	}
622	so->so_expire = curtime + SO_EXPIRE;
623	so->so_type = IPPROTO_UDP;
624	fd_nonblock(so->s);
625	so->so_sottl = 0;
626	so->so_sotos = 0;
627	so->so_sodf = -1;
628	SOCKET_LOCK_CREATE(so);
629	QSOCKET_LOCK(udb);
630	insque(pData, so, &udb);
631	NSOCK_INC();
632	QSOCKET_UNLOCK(udb);
633
634	memset(&addr, 0, sizeof(addr));
635	#ifdef RT_OS_DARWIN
636	addr.sin_len = sizeof(addr);
637	#endif
638	addr.sin_family = AF_INET;
639	addr.sin_addr.s_addr = bind_addr;
640	addr.sin_port = port;
641
642	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
643	{
644	LogRel(("NAT: bind to %RTnaipv4 has been failed\n", addr.sin_addr));
645	udp_detach(pData, so);
646	LogFlowFunc(("LEAVE: NULL\n"));
647	return NULL;
648	}
649	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
650	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
651
652	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
653	so->so_fport = addr.sin_port;
654	/* The original check was completely broken, as the commented out
655	* if statement was always true (INADDR_ANY=0). */
656	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
657	/* @todo: vvl - alias_addr should be set (if required)
658	* later by liabalias module.
659	*/
660	if (1 == 0) /* always use the else part */
661	so->so_faddr = alias_addr;
662	else
663	so->so_faddr = addr.sin_addr;
664
665	so->so_lport = lport;
666	so->so_laddr.s_addr = laddr;
667	if (flags != SS_FACCEPTONCE)
668	so->so_expire = 0;
669
670	so->so_state = SS_ISFCONNECTED;
671
672	LogFlowFunc(("LEAVE: %R[natsock]\n", so));
673	return so;
674	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 55192

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