udp.c

Last change on this file was 106061, checked in by vboxsync, 2 months ago
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1	/* $Id: udp.c 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* NAT - UDP protocol.
4	*/
5
6	/*
7	* Copyright (C) 2006-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28	/*
29	* This code is based on:
30	*
31	* Copyright (c) 1982, 1986, 1988, 1990, 1993
32	* The Regents of the University of California. All rights reserved.
33	*
34	* Redistribution and use in source and binary forms, with or without
35	* modification, are permitted provided that the following conditions
36	* are met:
37	* 1. Redistributions of source code must retain the above copyright
38	* notice, this list of conditions and the following disclaimer.
39	* 2. Redistributions in binary form must reproduce the above copyright
40	* notice, this list of conditions and the following disclaimer in the
41	* documentation and/or other materials provided with the distribution.
42	* 3. Neither the name of the University nor the names of its contributors
43	* may be used to endorse or promote products derived from this software
44	* without specific prior written permission.
45	*
46	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56	* SUCH DAMAGE.
57	*
58	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
59	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
60	*/
61
62	/*
63	* Changes and additions relating to SLiRP
64	* Copyright (c) 1995 Danny Gasparovski.
65	*
66	* Please read the file COPYRIGHT for the
67	* terms and conditions of the copyright.
68	*/
69
70	#include <slirp.h>
71	#include "ip_icmp.h"
72
73
74	/*
75	* UDP protocol implementation.
76	* Per RFC 768, August, 1980.
77	*/
78	#define udpcksum 1
79
80	void
81	udp_init(PNATState pData)
82	{
83	udp_last_so = &udb;
84	udb.so_next = udb.so_prev = &udb;
85	}
86
87	/* m->m_data points at ip packet header
88	* m->m_len length ip packet
89	* ip->ip_len length data (IPDU)
90	*/
91	void
92	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
93	{
94	register struct ip *ip;
95	register struct udphdr *uh;
96	int len;
97	struct ip save_ip;
98	struct socket *so;
99	int ret;
100	int ttl, tos;
101
102	LogFlowFunc(("ENTER: m = %p, iphlen = %d\n", m, iphlen));
103	ip = mtod(m, struct ip *);
104	Log2(("%RTnaipv4 iphlen = %d\n", ip->ip_dst, iphlen));
105
106	udpstat.udps_ipackets++;
107
108	/*
109	* Strip IP options, if any; should skip this,
110	* make available to user, and use on returned packets,
111	* but we don't yet have a way to check the checksum
112	* with options still present.
113	*/
114	if (iphlen > sizeof(struct ip))
115	{
116	ip_stripoptions(m, (struct mbuf *)0);
117	iphlen = sizeof(struct ip);
118	}
119
120	/*
121	* Get IP and UDP header together in first mbuf.
122	*/
123	ip = mtod(m, struct ip *);
124	uh = (struct udphdr *)((caddr_t)ip + iphlen);
125
126	/*
127	* Make mbuf data length reflect UDP length.
128	* If not enough data to reflect UDP length, drop.
129	*/
130	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
131	Assert(ip->ip_len + iphlen == (ssize_t)m_length(m, NULL));
132
133	if (ip->ip_len != len)
134	{
135	if (len > ip->ip_len)
136	{
137	udpstat.udps_badlen++;
138	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
139	goto bad_free_mbuf;
140	}
141	m_adj(m, len - ip->ip_len);
142	ip->ip_len = len;
143	}
144
145	/*
146	* Save a copy of the IP header in case we want restore it
147	* for sending an ICMP error message in response.
148	*/
149	save_ip = *ip;
150	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
151
152	/*
153	* Checksum extended UDP header and data.
154	*/
155	if (udpcksum && uh->uh_sum)
156	{
157	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
158	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
159	#if 0
160	/* keep uh_sum for ICMP reply */
161	uh->uh_sum = cksum(m, len + sizeof (struct ip));
162	if (uh->uh_sum)
163	{
164
165	#endif
166	if (cksum(m, len + iphlen))
167	{
168	udpstat.udps_badsum++;
169	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
170	goto bad_free_mbuf;
171	}
172	}
173	#if 0
174	}
175	#endif
176
177	/*
178	* handle DHCP/BOOTP
179	*/
180	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
181	{
182	bootp_input(pData, m);
183	goto done_free_mbuf;
184	}
185
186	LogFunc(("uh src: %RTnaipv4:%d, dst: %RTnaipv4:%d\n",
187	ip->ip_src.s_addr, RT_N2H_U16(uh->uh_sport),
188	ip->ip_dst.s_addr, RT_N2H_U16(uh->uh_dport)));
189
190	/*
191	* handle DNS host resolver without creating a socket
192	*/
193	if ( pData->fUseHostResolver
194	&& uh->uh_dport == RT_H2N_U16_C(53)
195	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS))
196	{
197	struct sockaddr_in dst, src;
198
199	src.sin_addr.s_addr = ip->ip_dst.s_addr;
200	src.sin_port = uh->uh_dport;
201	dst.sin_addr.s_addr = ip->ip_src.s_addr;
202	dst.sin_port = uh->uh_sport;
203
204	m_adj(m, sizeof(struct udpiphdr));
205
206	m = hostresolver(pData, m, ip->ip_src.s_addr, uh->uh_sport);
207	if (m == NULL)
208	goto done_free_mbuf;
209
210	slirpMbufTagService(pData, m, CTL_DNS);
211
212	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
213	LogFlowFuncLeave();
214	return;
215	}
216
217	/*
218	* handle TFTP
219	*/
220	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
221	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_TFTP))
222	{
223	if (pData->pvTftpSessions)
224	slirpTftpInput(pData, m);
225	goto done_free_mbuf;
226	}
227
228	/*
229	* XXX: DNS proxy currently relies on the fact that each socket
230	* only serves one request.
231	*/
232	if ( pData->fUseDnsProxy
233	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS)
234	&& (uh->uh_dport == RT_H2N_U16_C(53)))
235	{
236	so = NULL;
237	goto new_socket;
238	}
239
240	/*
241	* Drop UDP packets destind for CTL_ALIAS (i.e. the hosts loopback interface)
242	* if it is disabled.
243	*/
244	if ( CTL_CHECK(ip->ip_dst.s_addr, CTL_ALIAS)
245	&& !pData->fLocalhostReachable)
246	goto done_free_mbuf;
247
248	/*
249	* Locate pcb for datagram.
250	*/
251	so = udp_last_so;
252	if ( so->so_lport != uh->uh_sport
253	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
254	{
255	struct socket *tmp;
256
257	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
258	{
259	if ( tmp->so_lport == uh->uh_sport
260	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
261	{
262	so = tmp;
263	break;
264	}
265	}
266	if (tmp == &udb)
267	so = NULL;
268	else
269	{
270	udpstat.udpps_pcbcachemiss++;
271	udp_last_so = so;
272	}
273	}
274
275	new_socket:
276	if (so == NULL)
277	{
278	/*
279	* If there's no socket for this packet,
280	* create one
281	*/
282	if ((so = socreate()) == NULL)
283	{
284	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
285	goto bad_free_mbuf;
286	}
287
288	/*
289	* Setup fields
290	*/
291	so->so_laddr = ip->ip_src;
292	so->so_lport = uh->uh_sport;
293	so->so_iptos = ip->ip_tos;
294
295	if (udp_attach(pData, so) <= 0)
296	{
297	Log2(("NAT: IP(id: %hd) udp_attach errno = %d (%s)\n",
298	ip->ip_id, errno, strerror(errno)));
299	sofree(pData, so);
300	goto bad_free_mbuf;
301	}
302
303	/* udp_last_so = so; */
304	/*
305	* XXXXX Here, check if it's in udpexec_list,
306	* and if it is, do the fork_exec() etc.
307	*/
308	}
309
310	so->so_faddr = ip->ip_dst; /* XXX */
311	so->so_fport = uh->uh_dport; /* XXX */
312	Assert(so->so_type == IPPROTO_UDP);
313
314	/*
315	* DNS proxy
316	*/
317	if ( pData->fUseDnsProxy
318	&& CTL_CHECK(ip->ip_dst.s_addr, CTL_DNS)
319	&& (uh->uh_dport == RT_H2N_U16_C(53)))
320	{
321	dnsproxy_query(pData, so, m, iphlen);
322	goto done_free_mbuf;
323	}
324
325	iphlen += sizeof(struct udphdr);
326	m->m_len -= iphlen;
327	m->m_data += iphlen;
328
329	ttl = ip->ip_ttl = save_ip.ip_ttl;
330	if (ttl != so->so_sottl) {
331	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL,
332	(char *)&ttl, sizeof(ttl));
333	if (RT_LIKELY(ret == 0))
334	so->so_sottl = ttl;
335	}
336
337	tos = save_ip.ip_tos;
338	if (tos != so->so_sotos) {
339	ret = setsockopt(so->s, IPPROTO_IP, IP_TOS,
340	(char *)&tos, sizeof(tos));
341	if (RT_LIKELY(ret == 0))
342	so->so_sotos = tos;
343	}
344
345	{
346	/*
347	* Different OSes have different socket options for DF. We
348	* can't use IP_HDRINCL here as it's only valid for SOCK_RAW.
349	*/
350	# define USE_DF_OPTION(_Optname) \
351	const int dfopt = _Optname
352	#if defined(IP_MTU_DISCOVER)
353	USE_DF_OPTION(IP_MTU_DISCOVER);
354	#elif defined(IP_DONTFRAG) /* Solaris 11+, FreeBSD */
355	USE_DF_OPTION(IP_DONTFRAG);
356	#elif defined(IP_DONTFRAGMENT) /* Windows */
357	USE_DF_OPTION(IP_DONTFRAGMENT);
358	#else
359	USE_DF_OPTION(0);
360	#endif
361	if (dfopt) {
362	int df = (save_ip.ip_off & IP_DF) != 0;
363	#if defined(IP_MTU_DISCOVER)
364	df = df ? IP_PMTUDISC_DO : IP_PMTUDISC_DONT;
365	#endif
366	if (df != so->so_sodf) {
367	ret = setsockopt(so->s, IPPROTO_IP, dfopt,
368	(char *)&df, sizeof(df));
369	if (RT_LIKELY(ret == 0))
370	so->so_sodf = df;
371	}
372	}
373	}
374
375	if ( sosendto(pData, so, m) == -1
376	&& ( !soIgnorableErrorCode(errno)
377	&& errno != ENOTCONN))
378	{
379	m->m_len += iphlen;
380	m->m_data -= iphlen;
381	*ip = save_ip;
382	Log2(("NAT: UDP tx errno = %d (%s) on sent to %RTnaipv4\n",
383	errno, strerror(errno), ip->ip_dst));
384	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
385	so->so_m = NULL;
386	LogFlowFuncLeave();
387	return;
388	}
389
390	if (so->so_m)
391	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
392
393	/* restore the orig mbuf packet */
394	m->m_len += iphlen;
395	m->m_data -= iphlen;
396	*ip = save_ip;
397	so->so_m = m; /* ICMP backup */
398	LogFlowFuncLeave();
399	return;
400
401	bad_free_mbuf:
402	Log2(("NAT: UDP(id: %hd) datagram to %RTnaipv4 with size(%d) claimed as bad\n",
403	ip->ip_id, &ip->ip_dst, ip->ip_len));
404
405	done_free_mbuf:
406	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
407	* and create new m'buffers to send them to guest, so we'll free their incomming
408	* buffers here.
409	*/
410	if (m != NULL)
411	m_freem(pData, m);
412	LogFlowFuncLeave();
413	return;
414	}
415
416	/**
417	* Output a UDP packet.
418	*
419	* @note This function will finally free m!
420	*/
421	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
422	struct sockaddr_in saddr, struct sockaddr_in daddr,
423	int iptos)
424	{
425	register struct udpiphdr *ui;
426	int error;
427	int mlen = 0;
428
429	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4, daddr = %RTnaipv4\n",
430	so, m, saddr->sin_addr.s_addr, daddr->sin_addr.s_addr));
431
432	/* in case of built-in service so might be NULL */
433	if (so) Assert(so->so_type == IPPROTO_UDP);
434
435	/*
436	* Adjust for header
437	*/
438	m->m_data -= sizeof(struct udpiphdr);
439	m->m_len += sizeof(struct udpiphdr);
440	mlen = m_length(m, NULL);
441
442	/*
443	* Fill in mbuf with extended UDP header
444	* and addresses and length put into network format.
445	*/
446	ui = mtod(m, struct udpiphdr *);
447	memset(ui->ui_x1, 0, 9);
448	ui->ui_pr = IPPROTO_UDP;
449	ui->ui_len = RT_H2N_U16((uint16_t)(mlen - sizeof(struct ip)));
450	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
451	ui->ui_src = saddr->sin_addr;
452	ui->ui_dst = daddr->sin_addr;
453	ui->ui_sport = saddr->sin_port;
454	ui->ui_dport = daddr->sin_port;
455	ui->ui_ulen = ui->ui_len;
456
457	/*
458	* Stuff checksum and output datagram.
459	*/
460	ui->ui_sum = 0;
461	if (udpcksum)
462	{
463	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ mlen)) == 0)
464	ui->ui_sum = 0xffff;
465	}
466	((struct ip *)ui)->ip_len = mlen;
467	((struct ip *)ui)->ip_ttl = ip_defttl;
468	((struct ip *)ui)->ip_tos = iptos;
469
470	udpstat.udps_opackets++;
471
472	error = ip_output(pData, so, m);
473
474	return error;
475	}
476
477	/**
478	* @note This function will free m!
479	*/
480	int udp_output(PNATState pData, struct socket so, struct mbuf m,
481	struct sockaddr_in *addr)
482	{
483	struct sockaddr_in saddr, daddr;
484
485	Assert(so->so_type == IPPROTO_UDP);
486	LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4\n", so, m, addr->sin_addr.s_addr));
487
488	if (so->so_laddr.s_addr == INADDR_ANY)
489	{
490	if (pData->guest_addr_guess.s_addr != INADDR_ANY)
491	{
492	LogRel2(("NAT: port-forward: using %RTnaipv4 for %R[natsock]\n",
493	pData->guest_addr_guess.s_addr, so));
494	so->so_laddr = pData->guest_addr_guess;
495	}
496	else
497	{
498	LogRel2(("NAT: port-forward: guest address unknown for %R[natsock]\n", so));
499	m_freem(pData, m);
500	return 0;
501	}
502	}
503
504	saddr = *addr;
505	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
506	{
507	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
508	if (slirpIsWideCasting(pData, so->so_faddr.s_addr))
509	{
510	/**
511	* We haven't got real firewall but have got its submodule libalias.
512	*/
513	m->m_flags \|= M_SKIP_FIREWALL;
514	/**
515	* udp/137 port is Name Service in NetBIOS protocol. for some reasons Windows guest rejects
516	* accept data from non-aliased server.
517	*/
518	if ( (so->so_fport == so->so_lport)
519	&& (so->so_fport == RT_H2N_U16(137)))
520	saddr.sin_addr.s_addr = alias_addr.s_addr;
521	else
522	saddr.sin_addr.s_addr = addr->sin_addr.s_addr;
523	so->so_faddr.s_addr = addr->sin_addr.s_addr;
524	}
525	}
526
527	/* Any UDP packet to the loopback address must be translated to be from
528	* the forwarding address, i.e. 10.0.2.2. */
529	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
530	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
531	saddr.sin_addr.s_addr = alias_addr.s_addr;
532
533	daddr.sin_addr = so->so_laddr;
534	daddr.sin_port = so->so_lport;
535
536	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
537	}
538
539	int
540	udp_attach(PNATState pData, struct socket *so)
541	{
542	struct sockaddr sa_addr;
543	socklen_t socklen = sizeof(struct sockaddr);
544	int status;
545	int opt = 1;
546
547	AssertReturn(so->so_type == 0, -1);
548	so->so_type = IPPROTO_UDP;
549
550	so->s = socket(AF_INET, SOCK_DGRAM, 0);
551	if (so->s == -1)
552	goto error;
553	fd_nonblock(so->s);
554
555	so->so_sottl = 0;
556	so->so_sotos = 0;
557	so->so_sodf = -1;
558
559	status = sobind(pData, so);
560	if (status != 0)
561	return status;
562
563	/* success, insert in queue */
564	so->so_expire = curtime + SO_EXPIRE;
565
566	/* enable broadcast for later use */
567	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
568
569	status = getsockname(so->s, &sa_addr, &socklen);
570	if (status == 0)
571	{
572	Assert(sa_addr.sa_family == AF_INET);
573	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
574	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
575	}
576
577	SOCKET_LOCK_CREATE(so);
578	QSOCKET_LOCK(udb);
579	insque(pData, so, &udb);
580	NSOCK_INC();
581	QSOCKET_UNLOCK(udb);
582	return so->s;
583	error:
584	Log2(("NAT: can't create datagram socket\n"));
585	return -1;
586	}
587
588	void
589	udp_detach(PNATState pData, struct socket *so)
590	{
591	if (so != &pData->icmp_socket)
592	{
593	Assert(so->so_type == IPPROTO_UDP);
594	QSOCKET_LOCK(udb);
595	SOCKET_LOCK(so);
596	QSOCKET_UNLOCK(udb);
597	closesocket(so->s);
598	sofree(pData, so);
599	SOCKET_UNLOCK(so);
600	}
601	}
602
603	struct socket *
604	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
605	{
606	struct sockaddr_in addr;
607	struct socket *so;
608	socklen_t addrlen = sizeof(struct sockaddr_in);
609	int opt = 1;
610	LogFlowFunc(("ENTER: bind_addr:%RTnaipv4, port:%d, laddr:%RTnaipv4, lport:%d, flags:%x\n",
611	bind_addr, RT_N2H_U16(port), laddr, RT_N2H_U16(lport), flags));
612
613	if ((so = socreate()) == NULL)
614	{
615	LogFlowFunc(("LEAVE: NULL\n"));
616	return NULL;
617	}
618
619	so->s = socket(AF_INET, SOCK_DGRAM, 0);
620	if (so->s == -1)
621	{
622	LogRel(("NAT: can't create datagram socket\n"));
623	RTMemFree(so);
624	LogFlowFunc(("LEAVE: NULL\n"));
625	return NULL;
626	}
627	so->so_expire = curtime + SO_EXPIRE;
628	so->so_type = IPPROTO_UDP;
629	fd_nonblock(so->s);
630	so->so_sottl = 0;
631	so->so_sotos = 0;
632	so->so_sodf = -1;
633	SOCKET_LOCK_CREATE(so);
634	QSOCKET_LOCK(udb);
635	insque(pData, so, &udb);
636	NSOCK_INC();
637	QSOCKET_UNLOCK(udb);
638
639	memset(&addr, 0, sizeof(addr));
640	#ifdef RT_OS_DARWIN
641	addr.sin_len = sizeof(addr);
642	#endif
643	addr.sin_family = AF_INET;
644	addr.sin_addr.s_addr = bind_addr;
645	addr.sin_port = port;
646
647	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
648	{
649	LogRel(("NAT: udp bind to %RTnaipv4:%d failed, error %d\n",
650	addr.sin_addr, RT_N2H_U16(port), errno));
651	udp_detach(pData, so);
652	LogFlowFunc(("LEAVE: NULL\n"));
653	return NULL;
654	}
655	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
656	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
657
658	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
659	so->so_hladdr = addr.sin_addr;
660	so->so_hlport = addr.sin_port;
661
662	/* XXX: wtf are we setting so_faddr/so_fport here? */
663	so->so_fport = addr.sin_port;
664	#if 0
665	/* The original check was completely broken, as the commented out
666	* if statement was always true (INADDR_ANY=0). */
667	/** @todo vvl - alias_addr should be set (if required)
668	* later by liabalias module.
669	*/
670	if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr)
671	so->so_faddr = alias_addr;
672	else
673	#endif
674	so->so_faddr = addr.sin_addr;
675
676	so->so_lport = lport;
677	so->so_laddr.s_addr = laddr;
678	if (flags != SS_FACCEPTONCE)
679	so->so_expire = 0;
680
681	so->so_state = SS_ISFCONNECTED;
682
683	LogFlowFunc(("LEAVE: %R[natsock]\n", so));
684	return so;
685	}

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

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