udp.c@ 8483

Last change on this file since 8483 was 8009, checked in by vboxsync, 17 years ago
slirp: make it possible to configure the netmask
Property svn:eol-style set to `native`
File size: 17.8 KB

Line
1	/*
2	* Copyright (c) 1982, 1986, 1988, 1990, 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	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
34	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
35	*/
36
37	/*
38	* Changes and additions relating to SLiRP
39	* Copyright (c) 1995 Danny Gasparovski.
40	*
41	* Please read the file COPYRIGHT for the
42	* terms and conditions of the copyright.
43	*/
44
45	#include <slirp.h>
46	#include "ip_icmp.h"
47
48
49	/*
50	* UDP protocol implementation.
51	* Per RFC 768, August, 1980.
52	*/
53	#define udpcksum 1
54
55	void
56	udp_init(PNATState pData)
57	{
58	udp_last_so = &udb;
59	udb.so_next = udb.so_prev = &udb;
60	}
61
62	/* m->m_data points at ip packet header
63	* m->m_len length ip packet
64	* ip->ip_len length data (IPDU)
65	*/
66	void
67	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
68	{
69	register struct ip *ip;
70	register struct udphdr *uh;
71	/* struct mbuf opts = 0;/
72	int len;
73	struct ip save_ip;
74	struct socket *so;
75
76	DEBUG_CALL("udp_input");
77	DEBUG_ARG("m = %lx", (long)m);
78	DEBUG_ARG("iphlen = %d", iphlen);
79
80	udpstat.udps_ipackets++;
81
82	/*
83	* Strip IP options, if any; should skip this,
84	* make available to user, and use on returned packets,
85	* but we don't yet have a way to check the checksum
86	* with options still present.
87	*/
88	if(iphlen > sizeof(struct ip)) {
89	ip_stripoptions(m, (struct mbuf *)0);
90	iphlen = sizeof(struct ip);
91	}
92
93	/*
94	* Get IP and UDP header together in first mbuf.
95	*/
96	ip = mtod(m, struct ip *);
97	uh = (struct udphdr *)((caddr_t)ip + iphlen);
98
99	/*
100	* Make mbuf data length reflect UDP length.
101	* If not enough data to reflect UDP length, drop.
102	*/
103	len = ntohs((u_int16_t)uh->uh_ulen);
104
105	if (ip->ip_len != len) {
106	if (len > ip->ip_len) {
107	udpstat.udps_badlen++;
108	goto bad;
109	}
110	m_adj(m, len - ip->ip_len);
111	ip->ip_len = len;
112	}
113
114	/*
115	* Save a copy of the IP header in case we want restore it
116	* for sending an ICMP error message in response.
117	*/
118	save_ip = *ip;
119	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
120
121	/*
122	* Checksum extended UDP header and data.
123	*/
124	if (udpcksum && uh->uh_sum) {
125	((struct ipovly *)ip)->ih_next = 0;
126	((struct ipovly *)ip)->ih_prev = 0;
127	((struct ipovly *)ip)->ih_x1 = 0;
128	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
129	/* keep uh_sum for ICMP reply
130	* uh->uh_sum = cksum(m, len + sizeof (struct ip));
131	* if (uh->uh_sum) {
132	*/
133	if(cksum(m, len + sizeof(struct ip))) {
134	udpstat.udps_badsum++;
135	goto bad;
136	}
137	}
138
139	/*
140	* handle DHCP/BOOTP
141	*/
142	if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
143	bootp_input(pData, m);
144	goto bad;
145	}
146
147	/*
148	* handle TFTP
149	*/
150	if (ntohs(uh->uh_dport) == TFTP_SERVER) {
151	tftp_input(pData, m);
152	goto bad;
153	}
154
155	/*
156	* Locate pcb for datagram.
157	*/
158	so = udp_last_so;
159	if (so->so_lport != uh->uh_sport \|\|
160	so->so_laddr.s_addr != ip->ip_src.s_addr) {
161	struct socket *tmp;
162
163	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
164	if (tmp->so_lport == uh->uh_sport &&
165	tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
166	so = tmp;
167	break;
168	}
169	}
170	if (tmp == &udb) {
171	so = NULL;
172	} else {
173	udpstat.udpps_pcbcachemiss++;
174	udp_last_so = so;
175	}
176	}
177
178	if (so == NULL) {
179	/*
180	* If there's no socket for this packet,
181	* create one
182	*/
183	if ((so = socreate()) == NULL) goto bad;
184	if(udp_attach(pData, so) == -1) {
185	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
186	errno,strerror(errno)));
187	sofree(pData, so);
188	goto bad;
189	}
190
191	/*
192	* Setup fields
193	*/
194	/* udp_last_so = so; */
195	so->so_laddr = ip->ip_src;
196	so->so_lport = uh->uh_sport;
197
198	if ((so->so_iptos = udp_tos(so)) == 0)
199	so->so_iptos = ip->ip_tos;
200
201	/*
202	* XXXXX Here, check if it's in udpexec_list,
203	* and if it is, do the fork_exec() etc.
204	*/
205	}
206
207	so->so_faddr = ip->ip_dst; /* XXX */
208	so->so_fport = uh->uh_dport; /* XXX */
209
210	iphlen += sizeof(struct udphdr);
211	m->m_len -= iphlen;
212	m->m_data += iphlen;
213
214	/*
215	* Now we sendto() the packet.
216	*/
217	if (so->so_emu)
218	udp_emu(pData, so, m);
219
220	if(sosendto(pData, so,m) == -1) {
221	m->m_len += iphlen;
222	m->m_data -= iphlen;
223	*ip=save_ip;
224	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
225	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
226	}
227
228	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
229
230	/* restore the orig mbuf packet */
231	m->m_len += iphlen;
232	m->m_data -= iphlen;
233	*ip=save_ip;
234	so->so_m=m; /* ICMP backup */
235
236	return;
237	bad:
238	m_freem(pData, m);
239	/* if (opts) m_freem(opts); */
240	return;
241	}
242
243	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
244	struct sockaddr_in saddr, struct sockaddr_in daddr,
245	int iptos)
246	{
247	register struct udpiphdr *ui;
248	int error = 0;
249
250	DEBUG_CALL("udp_output");
251	DEBUG_ARG("so = %lx", (long)so);
252	DEBUG_ARG("m = %lx", (long)m);
253	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
254	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
255
256	/*
257	* Adjust for header
258	*/
259	m->m_data -= sizeof(struct udpiphdr);
260	m->m_len += sizeof(struct udpiphdr);
261
262	/*
263	* Fill in mbuf with extended UDP header
264	* and addresses and length put into network format.
265	*/
266	ui = mtod(m, struct udpiphdr *);
267	ui->ui_next = ui->ui_prev = 0;
268	ui->ui_x1 = 0;
269	ui->ui_pr = IPPROTO_UDP;
270	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
271	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
272	ui->ui_src = saddr->sin_addr;
273	ui->ui_dst = daddr->sin_addr;
274	ui->ui_sport = saddr->sin_port;
275	ui->ui_dport = daddr->sin_port;
276	ui->ui_ulen = ui->ui_len;
277
278	/*
279	* Stuff checksum and output datagram.
280	*/
281	ui->ui_sum = 0;
282	if (udpcksum) {
283	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
284	ui->ui_sum = 0xffff;
285	}
286	((struct ip *)ui)->ip_len = m->m_len;
287
288	((struct ip *)ui)->ip_ttl = ip_defttl;
289	((struct ip *)ui)->ip_tos = iptos;
290
291	udpstat.udps_opackets++;
292
293	error = ip_output(pData, so, m);
294
295	return (error);
296	}
297
298	int udp_output(PNATState pData, struct socket so, struct mbuf m,
299	struct sockaddr_in *addr)
300	{
301	struct sockaddr_in saddr, daddr;
302
303	saddr = *addr;
304	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr) {
305	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
306	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
307	saddr.sin_addr.s_addr = alias_addr.s_addr;
308	}
309	/* Any UDP packet to the loopback address must be translated to be from
310	* the forwarding address, i.e. 10.0.2.2. */
311	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
312	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
313	saddr.sin_addr.s_addr = alias_addr.s_addr;
314
315	daddr.sin_addr = so->so_laddr;
316	daddr.sin_port = so->so_lport;
317
318	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
319	}
320
321	int
322	udp_attach(PNATState pData, struct socket *so)
323	{
324	struct sockaddr_in addr;
325
326	if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
327	/*
328	* Here, we bind() the socket. Although not really needed
329	* (sendto() on an unbound socket will bind it), it's done
330	* here so that emulation of ytalk etc. don't have to do it
331	*/
332	addr.sin_family = AF_INET;
333	addr.sin_port = 0;
334	addr.sin_addr.s_addr = INADDR_ANY;
335	if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
336	int lasterrno=errno;
337	closesocket(so->s);
338	so->s=-1;
339	#ifdef _WIN32
340	WSASetLastError(lasterrno);
341	#else
342	errno=lasterrno;
343	#endif
344	} else {
345	int opt = 1;
346	/* success, insert in queue */
347	so->so_expire = curtime + SO_EXPIRE;
348	/* enable broadcast for later use */
349	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
350	insque(pData, so,&udb);
351	}
352	}
353	return(so->s);
354	}
355
356	void
357	udp_detach(PNATState pData, struct socket *so)
358	{
359	/* Correctly update list if detaching last socket in list. */
360	if (so == udp_last_so) udp_last_so = &udb;
361	closesocket(so->s);
362	/* if (so->so_m) m_free(so->so_m); done by sofree */
363
364	sofree(pData, so);
365	}
366
367	static const struct tos_t udptos[] = {
368	{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
369	{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
370	{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
371	{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
372	{0, 0, 0, 0}
373	};
374
375	u_int8_t
376	udp_tos(so)
377	struct socket *so;
378	{
379	int i = 0;
380
381	while(udptos[i].tos) {
382	if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) \|\|
383	(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
384	so->so_emu = udptos[i].emu;
385	return udptos[i].tos;
386	}
387	i++;
388	}
389
390	return 0;
391	}
392
393	#ifdef EMULATE_TALK
394	#include "talkd.h"
395	#endif
396
397	/*
398	* Here, talk/ytalk/ntalk requests must be emulated
399	*/
400	void
401	udp_emu(PNATState pData, struct socket so, struct mbuf m)
402	{
403	struct sockaddr_in addr;
404	socklen_t addrlen = sizeof(addr);
405	#ifdef EMULATE_TALK
406	CTL_MSG_OLD *omsg;
407	CTL_MSG *nmsg;
408	char buff[sizeof(CTL_MSG)];
409	u_char type;
410
411	struct talk_request {
412	struct talk_request *next;
413	struct socket *udp_so;
414	struct socket *tcp_so;
415	} *req;
416
417	static struct talk_request *req_tbl = 0;
418
419	#endif
420
421	struct cu_header {
422	uint16_t d_family; /* destination family */
423	uint16_t d_port; /* destination port */
424	uint32_t d_addr; /* destination address */
425	uint16_t s_family; /* source family */
426	uint16_t s_port; /* source port */
427	uint32_t so_addr; /* source address */
428	uint32_t seqn; /* sequence number */
429	uint16_t message; /* message */
430	uint16_t data_type; /* data type */
431	uint16_t pkt_len; /* packet length */
432	} *cu_head;
433
434	switch(so->so_emu) {
435
436	#ifdef EMULATE_TALK
437	case EMU_TALK:
438	case EMU_NTALK:
439	/*
440	* Talk emulation. We always change the ctl_addr to get
441	* some answers from the daemon. When an ANNOUNCE comes,
442	* we send LEAVE_INVITE to the local daemons. Also when a
443	* DELETE comes, we send copies to the local daemons.
444	*/
445	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
446	return;
447
448	#define IS_OLD (so->so_emu == EMU_TALK)
449
450	#define COPY_MSG(dest, src) { dest->type = src->type; \
451	dest->id_num = src->id_num; \
452	dest->pid = src->pid; \
453	dest->addr = src->addr; \
454	dest->ctl_addr = src->ctl_addr; \
455	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
456	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
457	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
458
459	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
460	/* old_sockaddr to sockaddr_in */
461
462
463	if (IS_OLD) { /* old talk */
464	omsg = mtod(m, CTL_MSG_OLD*);
465	nmsg = (CTL_MSG *) buff;
466	type = omsg->type;
467	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
468	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
469	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
470	} else { /* new talk */
471	omsg = (CTL_MSG_OLD *) buff;
472	nmsg = mtod(m, CTL_MSG *);
473	type = nmsg->type;
474	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
475	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
476	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
477	}
478
479	if (type == LOOK_UP)
480	return; /* for LOOK_UP this is enough */
481
482	if (IS_OLD) { /* make a copy of the message */
483	COPY_MSG(nmsg, omsg);
484	nmsg->vers = 1;
485	nmsg->answer = 0;
486	} else
487	COPY_MSG(omsg, nmsg);
488
489	/*
490	* If if is an ANNOUNCE message, we go through the
491	* request table to see if a tcp port has already
492	* been redirected for this socket. If not, we solisten()
493	* a new socket and add this entry to the table.
494	* The port number of the tcp socket and our IP
495	* are put to the addr field of the message structures.
496	* Then a LEAVE_INVITE is sent to both local daemon
497	* ports, 517 and 518. This is why we have two copies
498	* of the message, one in old talk and one in new talk
499	* format.
500	*/
501
502	if (type == ANNOUNCE) {
503	int s;
504	u_short temp_port;
505
506	for(req = req_tbl; req; req = req->next)
507	if (so == req->udp_so)
508	break; /* found it */
509
510	if (!req) { /* no entry for so, create new */
511	req = (struct talk_request *)
512	malloc(sizeof(struct talk_request));
513	req->udp_so = so;
514	req->tcp_so = solisten(0,
515	OTOSIN(omsg, addr)->sin_addr.s_addr,
516	OTOSIN(omsg, addr)->sin_port,
517	SS_FACCEPTONCE);
518	req->next = req_tbl;
519	req_tbl = req;
520	}
521
522	/* replace port number in addr field */
523	addrlen = sizeof(addr);
524	getsockname(req->tcp_so->s,
525	(struct sockaddr *) &addr,
526	&addrlen);
527	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
528	OTOSIN(omsg, addr)->sin_addr = our_addr;
529	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
530	OTOSIN(nmsg, addr)->sin_addr = our_addr;
531
532	/* send LEAVE_INVITEs */
533	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
534	OTOSIN(omsg, ctl_addr)->sin_port = 0;
535	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
536	omsg->type = nmsg->type = LEAVE_INVITE;
537
538	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
539	addr.sin_addr = our_addr;
540	addr.sin_family = AF_INET;
541	addr.sin_port = htons(517);
542	sendto(s, (char )omsg, sizeof(omsg), 0,
543	(struct sockaddr *)&addr, sizeof(addr));
544	addr.sin_port = htons(518);
545	sendto(s, (char )nmsg, sizeof(nmsg), 0,
546	(struct sockaddr *) &addr, sizeof(addr));
547	closesocket(s) ;
548
549	omsg->type = nmsg->type = ANNOUNCE;
550	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
551	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
552	}
553
554	/*
555	* If it is a DELETE message, we send a copy to the
556	* local daemons. Then we delete the entry corresponding
557	* to our socket from the request table.
558	*/
559
560	if (type == DELETE) {
561	struct talk_request temp_req, req_next;
562	int s;
563	u_short temp_port;
564
565	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
566	OTOSIN(omsg, ctl_addr)->sin_port = 0;
567	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
568
569	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
570	addr.sin_addr = our_addr;
571	addr.sin_family = AF_INET;
572	addr.sin_port = htons(517);
573	sendto(s, (char )omsg, sizeof(omsg), 0,
574	(struct sockaddr *)&addr, sizeof(addr));
575	addr.sin_port = htons(518);
576	sendto(s, (char )nmsg, sizeof(nmsg), 0,
577	(struct sockaddr *)&addr, sizeof(addr));
578	closesocket(s);
579
580	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
581	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
582
583	/* delete table entry */
584	if (so == req_tbl->udp_so) {
585	temp_req = req_tbl;
586	req_tbl = req_tbl->next;
587	free(temp_req);
588	} else {
589	temp_req = req_tbl;
590	for(req = req_tbl->next; req; req = req_next) {
591	req_next = req->next;
592	if (so == req->udp_so) {
593	temp_req->next = req_next;
594	free(req);
595	break;
596	} else {
597	temp_req = req;
598	}
599	}
600	}
601	}
602
603	return;
604	#endif
605
606	case EMU_CUSEEME:
607
608	/*
609	* Cu-SeeMe emulation.
610	* Hopefully the packet is more that 16 bytes long. We don't
611	* do any other tests, just replace the address and port
612	* fields.
613	*/
614	if (m->m_len >= sizeof (*cu_head)) {
615	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
616	return;
617	cu_head = mtod(m, struct cu_header *);
618	cu_head->s_port = addr.sin_port;
619	cu_head->so_addr = our_addr.s_addr;
620	}
621
622	return;
623	}
624	}
625
626	struct socket *
627	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
628	{
629	struct sockaddr_in addr;
630	struct socket *so;
631	socklen_t addrlen = sizeof(struct sockaddr_in);
632	int opt = 1;
633
634	if ((so = socreate()) == NULL) {
635	free(so);
636	return NULL;
637	}
638	so->s = socket(AF_INET,SOCK_DGRAM,0);
639	so->so_expire = curtime + SO_EXPIRE;
640	insque(pData, so,&udb);
641
642	addr.sin_family = AF_INET;
643	addr.sin_addr.s_addr = INADDR_ANY;
644	addr.sin_port = port;
645
646	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
647	udp_detach(pData, so);
648	return NULL;
649	}
650	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
651	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
652
653	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
654	so->so_fport = addr.sin_port;
655	/* The original check was completely broken, as the commented out
656	* if statement was always true (INADDR_ANY=0). */
657	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
658	if (1 == 0) /* always use the else part */
659	so->so_faddr = alias_addr;
660	else
661	so->so_faddr = addr.sin_addr;
662
663	so->so_lport = lport;
664	so->so_laddr.s_addr = laddr;
665	if (flags != SS_FACCEPTONCE)
666	so->so_expire = 0;
667
668	so->so_state = SS_ISFCONNECTED;
669
670	return so;
671	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 8483

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