udp.c@ 53360

Last change on this file since 53360 was 52258, checked in by vboxsync, 11 years ago
NAT: Oops, g/c leftover debug printfs accidentally committed in r95347.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 19.6 KB

Line
1	/* $Id: udp.c 52258 2014-08-04 00:29:00Z 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	* Locate pcb for datagram.
213	*/
214	so = udp_last_so;
215	if ( so->so_lport != uh->uh_sport
216	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
217	{
218	struct socket *tmp;
219
220	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
221	{
222	if ( tmp->so_lport == uh->uh_sport
223	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
224	{
225	so = tmp;
226	break;
227	}
228	}
229	if (tmp == &udb)
230	so = NULL;
231	else
232	{
233	udpstat.udpps_pcbcachemiss++;
234	udp_last_so = so;
235	}
236	}
237
238	if (so == NULL)
239	{
240	/*
241	* If there's no socket for this packet,
242	* create one
243	*/
244	if ((so = socreate()) == NULL)
245	{
246	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
247	goto bad_free_mbuf;
248	}
249	if (udp_attach(pData, so) <= 0)
250	{
251	Log2(("NAT: IP(id: %hd) udp_attach errno = %d (%s)\n",
252	ip->ip_id, errno, strerror(errno)));
253	sofree(pData, so);
254	goto bad_free_mbuf;
255	}
256
257	/*
258	* Setup fields
259	*/
260	/* udp_last_so = so; */
261	so->so_laddr = ip->ip_src;
262	so->so_lport = uh->uh_sport;
263
264	so->so_iptos = ip->ip_tos;
265
266	/*
267	* XXXXX Here, check if it's in udpexec_list,
268	* and if it is, do the fork_exec() etc.
269	*/
270	}
271
272	so->so_faddr = ip->ip_dst; /* XXX */
273	so->so_fport = uh->uh_dport; /* XXX */
274	Assert(so->so_type == IPPROTO_UDP);
275
276	/*
277	* DNS proxy
278	*/
279	if ( pData->fUseDnsProxy
280	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS)
281	&& (uh->uh_dport == RT_H2N_U16_C(53)))
282	{
283	dnsproxy_query(pData, so, m, iphlen);
284	goto done_free_mbuf;
285	}
286
287	iphlen += sizeof(struct udphdr);
288	m->m_len -= iphlen;
289	m->m_data += iphlen;
290
291	ttl = ip->ip_ttl = save_ip.ip_ttl;
292	if (ttl != so->so_sottl) {
293	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL,
294	(char *)&ttl, sizeof(ttl));
295	if (RT_LIKELY(ret == 0))
296	so->so_sottl = ttl;
297	}
298
299	tos = save_ip.ip_tos;
300	if (tos != so->so_sotos) {
301	ret = setsockopt(so->s, IPPROTO_IP, IP_TOS,
302	(char *)&tos, sizeof(tos));
303	if (RT_LIKELY(ret == 0))
304	so->so_sotos = tos;
305	}
306
307	{
308	/*
309	* Different OSes have different socket options for DF. We
310	* can't use IP_HDRINCL here as it's only valid for SOCK_RAW.
311	*/
312	# define USE_DF_OPTION(_Optname) \
313	const int dfopt = _Optname; \
314	const char * const dfoptname = #_Optname;
315	#if defined(IP_MTU_DISCOVER)
316	USE_DF_OPTION(IP_MTU_DISCOVER);
317	#elif defined(IP_DONTFRAG) /* Solaris 11+, FreeBSD */
318	USE_DF_OPTION(IP_DONTFRAG);
319	#elif defined(IP_DONTFRAGMENT) /* Windows */
320	USE_DF_OPTION(IP_DONTFRAGMENT);
321	#else
322	USE_DF_OPTION(0);
323	#endif
324	if (dfopt) {
325	int df = (save_ip.ip_off & IP_DF) != 0;
326	#if defined(IP_MTU_DISCOVER)
327	df = df ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
328	#endif
329	if (df != so->so_sodf) {
330	ret = setsockopt(so->s, IPPROTO_IP, dfopt,
331	(char *)&df, sizeof(df));
332	if (RT_LIKELY(ret == 0))
333	so->so_sodf = df;
334	}
335	}
336	}
337
338	if ( sosendto(pData, so, m) == -1
339	&& ( !soIgnorableErrorCode(errno)
340	&& errno != ENOTCONN))
341	{
342	m->m_len += iphlen;
343	m->m_data -= iphlen;
344	*ip = save_ip;
345	Log2(("NAT: UDP tx errno = %d (%s) on sent to %RTnaipv4\n",
346	errno, strerror(errno), ip->ip_dst));
347	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
348	so->so_m = NULL;
349	LogFlowFuncLeave();
350	return;
351	}
352
353	if (so->so_m)
354	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
355
356	/* restore the orig mbuf packet */
357	m->m_len += iphlen;
358	m->m_data -= iphlen;
359	*ip = save_ip;
360	so->so_m = m; /* ICMP backup */
361	LogFlowFuncLeave();
362	return;
363
364	bad_free_mbuf:
365	Log2(("NAT: UDP(id: %hd) datagram to %RTnaipv4 with size(%d) claimed as bad\n",
366	ip->ip_id, &ip->ip_dst, ip->ip_len));
367
368	done_free_mbuf:
369	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
370	* and create new m'buffers to send them to guest, so we'll free their incomming
371	* buffers here.
372	*/
373	m_freem(pData, m);
374	LogFlowFuncLeave();
375	return;
376	}
377
378	/**
379	* Output a UDP packet.
380	*
381	* @note This function will finally free m!
382	*/
383	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
384	struct sockaddr_in saddr, struct sockaddr_in daddr,
385	int iptos)
386	{
387	register struct udpiphdr *ui;
388	int error;
389	int mlen = 0;
390
391	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4, daddr = %RTnaipv4\n",
392	so, m, saddr->sin_addr.s_addr, daddr->sin_addr.s_addr));
393
394	/* in case of built-in service so might be NULL */
395	if (so) Assert(so->so_type == IPPROTO_UDP);
396
397	/*
398	* Adjust for header
399	*/
400	m->m_data -= sizeof(struct udpiphdr);
401	m->m_len += sizeof(struct udpiphdr);
402	mlen = m_length(m, NULL);
403
404	/*
405	* Fill in mbuf with extended UDP header
406	* and addresses and length put into network format.
407	*/
408	ui = mtod(m, struct udpiphdr *);
409	memset(ui->ui_x1, 0, 9);
410	ui->ui_pr = IPPROTO_UDP;
411	ui->ui_len = RT_H2N_U16(mlen - sizeof(struct ip));
412	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
413	ui->ui_src = saddr->sin_addr;
414	ui->ui_dst = daddr->sin_addr;
415	ui->ui_sport = saddr->sin_port;
416	ui->ui_dport = daddr->sin_port;
417	ui->ui_ulen = ui->ui_len;
418
419	/*
420	* Stuff checksum and output datagram.
421	*/
422	ui->ui_sum = 0;
423	if (udpcksum)
424	{
425	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ mlen)) == 0)
426	ui->ui_sum = 0xffff;
427	}
428	((struct ip *)ui)->ip_len = mlen;
429	((struct ip *)ui)->ip_ttl = ip_defttl;
430	((struct ip *)ui)->ip_tos = iptos;
431
432	udpstat.udps_opackets++;
433
434	error = ip_output(pData, so, m);
435
436	return error;
437	}
438
439	/**
440	* @note This function will free m!
441	*/
442	int udp_output(PNATState pData, struct socket so, struct mbuf m,
443	struct sockaddr_in *addr)
444	{
445	struct sockaddr_in saddr, daddr;
446	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
447	struct socket *pSocketClone = NULL;
448	#endif
449	Assert(so->so_type == IPPROTO_UDP);
450	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4\n",
451	so, (long)m, addr->sin_addr.s_addr));
452
453	saddr = *addr;
454	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
455	{
456	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
457	if (slirpIsWideCasting(pData, so->so_faddr.s_addr))
458	{
459	/**
460	* We haven't got real firewall but have got its submodule libalias.
461	*/
462	m->m_flags \|= M_SKIP_FIREWALL;
463	/**
464	* udp/137 port is Name Service in NetBIOS protocol. for some reasons Windows guest rejects
465	* accept data from non-aliased server.
466	*/
467	if ( (so->so_fport == so->so_lport)
468	&& (so->so_fport == RT_H2N_U16(137)))
469	saddr.sin_addr.s_addr = alias_addr.s_addr;
470	else
471	saddr.sin_addr.s_addr = addr->sin_addr.s_addr;
472	/* we shouldn't override initial socket */
473	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
474	if (so->so_cCloneCounter)
475	pSocketClone = soLookUpClonedUDPSocket(pData, so, addr->sin_addr.s_addr);
476	if (!pSocketClone)
477	pSocketClone = soCloneUDPSocketWithForegnAddr(pData, false, so, addr->sin_addr.s_addr);
478	Assert((pSocketClone));
479	so = pSocketClone;
480	#else
481	so->so_faddr.s_addr = addr->sin_addr.s_addr;
482	#endif
483	}
484	}
485
486	/* Any UDP packet to the loopback address must be translated to be from
487	* the forwarding address, i.e. 10.0.2.2. */
488	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
489	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
490	saddr.sin_addr.s_addr = alias_addr.s_addr;
491
492	daddr.sin_addr = so->so_laddr;
493	daddr.sin_port = so->so_lport;
494
495	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
496	}
497
498	int
499	udp_attach(PNATState pData, struct socket *so)
500	{
501	struct sockaddr_in *addr;
502	struct sockaddr sa_addr;
503	socklen_t socklen = sizeof(struct sockaddr);
504	int status;
505	int opt = 1;
506
507	/* We attaching some olready attched socket ??? */
508	Assert(so->so_type == 0);
509	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
510	goto error;
511	so->so_sottl = 0;
512	so->so_sotos = 0;
513	so->so_sodf = -1;
514	/*
515	* Here, we bind() the socket. Although not really needed
516	* (sendto() on an unbound socket will bind it), it's done
517	* here so that emulation of ytalk etc. don't have to do it
518	*/
519	memset(&sa_addr, 0, sizeof(struct sockaddr));
520	addr = (struct sockaddr_in *)&sa_addr;
521	#ifdef RT_OS_DARWIN
522	addr->sin_len = sizeof(struct sockaddr_in);
523	#endif
524	addr->sin_family = AF_INET;
525	addr->sin_addr.s_addr = pData->bindIP.s_addr;
526	fd_nonblock(so->s);
527	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
528	{
529	int lasterrno = errno;
530	closesocket(so->s);
531	so->s = -1;
532	#ifdef RT_OS_WINDOWS
533	WSASetLastError(lasterrno);
534	#else
535	errno = lasterrno;
536	#endif
537	goto error;
538	}
539	/* success, insert in queue */
540	so->so_expire = curtime + SO_EXPIRE;
541	/* enable broadcast for later use */
542	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
543	status = getsockname(so->s, &sa_addr, &socklen);
544	Assert(status == 0 && sa_addr.sa_family == AF_INET);
545	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
546	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
547
548	SOCKET_LOCK_CREATE(so);
549	QSOCKET_LOCK(udb);
550	insque(pData, so, &udb);
551	NSOCK_INC();
552	QSOCKET_UNLOCK(udb);
553	so->so_type = IPPROTO_UDP;
554	return so->s;
555	error:
556	Log2(("NAT: can't create datagramm socket\n"));
557	return -1;
558	}
559
560	void
561	udp_detach(PNATState pData, struct socket *so)
562	{
563	if (so != &pData->icmp_socket)
564	{
565	Assert(so->so_type == IPPROTO_UDP);
566	QSOCKET_LOCK(udb);
567	SOCKET_LOCK(so);
568	QSOCKET_UNLOCK(udb);
569	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
570	if (so->so_cloneOf)
571	so->so_cloneOf->so_cCloneCounter--;
572	else if (so->so_cCloneCounter > 0)
573	{
574	/* we can't close socket yet */
575	SOCKET_UNLOCK(so);
576	return;
577	}
578	#endif
579	closesocket(so->s);
580	sofree(pData, so);
581	SOCKET_UNLOCK(so);
582	}
583	}
584
585	struct socket *
586	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
587	{
588	struct sockaddr_in addr;
589	struct socket *so;
590	socklen_t addrlen = sizeof(struct sockaddr_in);
591	int opt = 1;
592	LogFlowFunc(("ENTER: bind_addr:%RTnaipv4, port:%d, laddr:%RTnaipv4, lport:%d, flags:%x\n",
593	bind_addr, RT_N2H_U16(port), laddr, RT_N2H_U16(lport), flags));
594
595	if ((so = socreate()) == NULL)
596	{
597	LogFlowFunc(("LEAVE: NULL\n"));
598	return NULL;
599	}
600
601	so->s = socket(AF_INET, SOCK_DGRAM, 0);
602	if (so->s == -1)
603	{
604	LogRel(("NAT: can't create datagram socket\n"));
605	RTMemFree(so);
606	LogFlowFunc(("LEAVE: NULL\n"));
607	return NULL;
608	}
609	so->so_expire = curtime + SO_EXPIRE;
610	so->so_type = IPPROTO_UDP;
611	fd_nonblock(so->s);
612	so->so_sottl = 0;
613	so->so_sotos = 0;
614	so->so_sodf = -1;
615	SOCKET_LOCK_CREATE(so);
616	QSOCKET_LOCK(udb);
617	insque(pData, so, &udb);
618	NSOCK_INC();
619	QSOCKET_UNLOCK(udb);
620
621	memset(&addr, 0, sizeof(addr));
622	#ifdef RT_OS_DARWIN
623	addr.sin_len = sizeof(addr);
624	#endif
625	addr.sin_family = AF_INET;
626	addr.sin_addr.s_addr = bind_addr;
627	addr.sin_port = port;
628
629	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
630	{
631	LogRel(("NAT: bind to %RTnaipv4 has been failed\n", addr.sin_addr));
632	udp_detach(pData, so);
633	LogFlowFunc(("LEAVE: NULL\n"));
634	return NULL;
635	}
636	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
637	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
638
639	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
640	so->so_fport = addr.sin_port;
641	/* The original check was completely broken, as the commented out
642	* if statement was always true (INADDR_ANY=0). */
643	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
644	/* @todo: vvl - alias_addr should be set (if required)
645	* later by liabalias module.
646	*/
647	if (1 == 0) /* always use the else part */
648	so->so_faddr = alias_addr;
649	else
650	so->so_faddr = addr.sin_addr;
651
652	so->so_lport = lport;
653	so->so_laddr.s_addr = laddr;
654	if (flags != SS_FACCEPTONCE)
655	so->so_expire = 0;
656
657	so->so_state = SS_ISFCONNECTED;
658
659	LogFlowFunc(("LEAVE: %R[natsock]\n", so));
660	return so;
661	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 53360

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