udp.c@ 530

Last change on this file since 530 was 184, checked in by vboxsync, 18 years ago
merge with upstream
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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	struct udpstat udpstat;
49
50	struct socket udb;
51
52	/*
53	* UDP protocol implementation.
54	* Per RFC 768, August, 1980.
55	*/
56	#ifndef COMPAT_42
57	int udpcksum = 1;
58	#else
59	int udpcksum = 0; /* XXX */
60	#endif
61
62	struct socket *udp_last_so = &udb;
63
64	void
65	udp_init()
66	{
67	udb.so_next = udb.so_prev = &udb;
68	}
69	/* m->m_data points at ip packet header
70	* m->m_len length ip packet
71	* ip->ip_len length data (IPDU)
72	*/
73	void
74	udp_input(m, iphlen)
75	register struct mbuf *m;
76	int iphlen;
77	{
78	register struct ip *ip;
79	register struct udphdr *uh;
80	/* struct mbuf opts = 0;/
81	int len;
82	struct ip save_ip;
83	struct socket *so;
84
85	DEBUG_CALL("udp_input");
86	DEBUG_ARG("m = %lx", (long)m);
87	DEBUG_ARG("iphlen = %d", iphlen);
88
89	udpstat.udps_ipackets++;
90
91	/*
92	* Strip IP options, if any; should skip this,
93	* make available to user, and use on returned packets,
94	* but we don't yet have a way to check the checksum
95	* with options still present.
96	*/
97	if(iphlen > sizeof(struct ip)) {
98	ip_stripoptions(m, (struct mbuf *)0);
99	iphlen = sizeof(struct ip);
100	}
101
102	/*
103	* Get IP and UDP header together in first mbuf.
104	*/
105	ip = mtod(m, struct ip *);
106	uh = (struct udphdr *)((caddr_t)ip + iphlen);
107
108	/*
109	* Make mbuf data length reflect UDP length.
110	* If not enough data to reflect UDP length, drop.
111	*/
112	len = ntohs((u_int16_t)uh->uh_ulen);
113
114	if (ip->ip_len != len) {
115	if (len > ip->ip_len) {
116	udpstat.udps_badlen++;
117	goto bad;
118	}
119	m_adj(m, len - ip->ip_len);
120	ip->ip_len = len;
121	}
122
123	/*
124	* Save a copy of the IP header in case we want restore it
125	* for sending an ICMP error message in response.
126	*/
127	save_ip = *ip;
128	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
129
130	/*
131	* Checksum extended UDP header and data.
132	*/
133	if (udpcksum && uh->uh_sum) {
134	((struct ipovly *)ip)->ih_next = 0;
135	((struct ipovly *)ip)->ih_prev = 0;
136	((struct ipovly *)ip)->ih_x1 = 0;
137	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
138	/* keep uh_sum for ICMP reply
139	* uh->uh_sum = cksum(m, len + sizeof (struct ip));
140	* if (uh->uh_sum) {
141	*/
142	if(cksum(m, len + sizeof(struct ip))) {
143	udpstat.udps_badsum++;
144	goto bad;
145	}
146	}
147
148	/*
149	* handle DHCP/BOOTP
150	*/
151	if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
152	bootp_input(m);
153	goto bad;
154	}
155
156	/*
157	* handle TFTP
158	*/
159	if (ntohs(uh->uh_dport) == TFTP_SERVER) {
160	tftp_input(m);
161	goto bad;
162	}
163
164	/*
165	* Locate pcb for datagram.
166	*/
167	so = udp_last_so;
168	if (so->so_lport != uh->uh_sport \|\|
169	so->so_laddr.s_addr != ip->ip_src.s_addr) {
170	struct socket *tmp;
171
172	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next) {
173	if (tmp->so_lport == uh->uh_sport &&
174	tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
175	#ifndef VBOX /* Move this further down, as it must be done also for the cache hit case. */
176	tmp->so_faddr.s_addr = ip->ip_dst.s_addr;
177	tmp->so_fport = uh->uh_dport;
178	#endif /* !VBOX */
179	so = tmp;
180	break;
181	}
182	}
183	if (tmp == &udb) {
184	so = NULL;
185	} else {
186	udpstat.udpps_pcbcachemiss++;
187	udp_last_so = so;
188	}
189	}
190
191	if (so == NULL) {
192	/*
193	* If there's no socket for this packet,
194	* create one
195	*/
196	if ((so = socreate()) == NULL) goto bad;
197	if(udp_attach(so) == -1) {
198	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
199	errno,strerror(errno)));
200	sofree(so);
201	goto bad;
202	}
203
204	/*
205	* Setup fields
206	*/
207	/* udp_last_so = so; */
208	so->so_laddr = ip->ip_src;
209	so->so_lport = uh->uh_sport;
210
211	if ((so->so_iptos = udp_tos(so)) == 0)
212	so->so_iptos = ip->ip_tos;
213
214	/*
215	* XXXXX Here, check if it's in udpexec_list,
216	* and if it is, do the fork_exec() etc.
217	*/
218	}
219
220	so->so_faddr = ip->ip_dst; /* XXX */
221	so->so_fport = uh->uh_dport; /* XXX */
222
223	iphlen += sizeof(struct udphdr);
224	m->m_len -= iphlen;
225	m->m_data += iphlen;
226
227	/*
228	* Now we sendto() the packet.
229	*/
230	if (so->so_emu)
231	udp_emu(so, m);
232
233	if(sosendto(so,m) == -1) {
234	m->m_len += iphlen;
235	m->m_data -= iphlen;
236	*ip=save_ip;
237	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
238	icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
239	}
240
241	m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
242
243	/* restore the orig mbuf packet */
244	m->m_len += iphlen;
245	m->m_data -= iphlen;
246	*ip=save_ip;
247	so->so_m=m; /* ICMP backup */
248
249	return;
250	bad:
251	m_freem(m);
252	/* if (opts) m_freem(opts); */
253	return;
254	}
255
256	int udp_output2(struct socket so, struct mbuf m,
257	struct sockaddr_in saddr, struct sockaddr_in daddr,
258	int iptos)
259	{
260	register struct udpiphdr *ui;
261	int error = 0;
262
263	DEBUG_CALL("udp_output");
264	DEBUG_ARG("so = %lx", (long)so);
265	DEBUG_ARG("m = %lx", (long)m);
266	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
267	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
268
269	/*
270	* Adjust for header
271	*/
272	m->m_data -= sizeof(struct udpiphdr);
273	m->m_len += sizeof(struct udpiphdr);
274
275	/*
276	* Fill in mbuf with extended UDP header
277	* and addresses and length put into network format.
278	*/
279	ui = mtod(m, struct udpiphdr *);
280	ui->ui_next = ui->ui_prev = 0;
281	ui->ui_x1 = 0;
282	ui->ui_pr = IPPROTO_UDP;
283	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
284	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
285	ui->ui_src = saddr->sin_addr;
286	ui->ui_dst = daddr->sin_addr;
287	ui->ui_sport = saddr->sin_port;
288	ui->ui_dport = daddr->sin_port;
289	ui->ui_ulen = ui->ui_len;
290
291	/*
292	* Stuff checksum and output datagram.
293	*/
294	ui->ui_sum = 0;
295	if (udpcksum) {
296	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
297	ui->ui_sum = 0xffff;
298	}
299	((struct ip *)ui)->ip_len = m->m_len;
300
301	((struct ip *)ui)->ip_ttl = ip_defttl;
302	((struct ip *)ui)->ip_tos = iptos;
303
304	udpstat.udps_opackets++;
305
306	error = ip_output(so, m);
307
308	return (error);
309	}
310
311	int udp_output(struct socket so, struct mbuf m,
312	struct sockaddr_in *addr)
313
314	{
315	struct sockaddr_in saddr, daddr;
316
317	saddr = *addr;
318	if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
319	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
320	if ((so->so_faddr.s_addr & htonl(0x000000ff)) == htonl(0xff))
321	saddr.sin_addr.s_addr = alias_addr.s_addr;
322	}
323	daddr.sin_addr = so->so_laddr;
324	daddr.sin_port = so->so_lport;
325
326	return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
327	}
328
329	int
330	udp_attach(so)
331	struct socket *so;
332	{
333	struct sockaddr_in addr;
334
335	if((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1) {
336	/*
337	* Here, we bind() the socket. Although not really needed
338	* (sendto() on an unbound socket will bind it), it's done
339	* here so that emulation of ytalk etc. don't have to do it
340	*/
341	addr.sin_family = AF_INET;
342	addr.sin_port = 0;
343	addr.sin_addr.s_addr = INADDR_ANY;
344	if(bind(so->s, (struct sockaddr *)&addr, sizeof(addr))<0) {
345	int lasterrno=errno;
346	closesocket(so->s);
347	so->s=-1;
348	#ifdef _WIN32
349	WSASetLastError(lasterrno);
350	#else
351	errno=lasterrno;
352	#endif
353	} else {
354	/* success, insert in queue */
355	so->so_expire = curtime + SO_EXPIRE;
356	insque(so,&udb);
357	}
358	}
359	return(so->s);
360	}
361
362	void
363	udp_detach(so)
364	struct socket *so;
365	{
366	#ifdef VBOX
367	/* Correctly update list if detaching last socket in list. */
368	if (so == udp_last_so) udp_last_so = &udb;
369	#endif /* VBOX */
370	closesocket(so->s);
371	/* if (so->so_m) m_free(so->so_m); done by sofree */
372
373	sofree(so);
374	}
375
376	struct tos_t udptos[] = {
377	{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
378	{517, 517, IPTOS_LOWDELAY, EMU_TALK}, /* talk */
379	{518, 518, IPTOS_LOWDELAY, EMU_NTALK}, /* ntalk */
380	{0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME}, /* Cu-Seeme */
381	{0, 0, 0, 0}
382	};
383
384	u_int8_t
385	udp_tos(so)
386	struct socket *so;
387	{
388	int i = 0;
389
390	while(udptos[i].tos) {
391	if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) \|\|
392	(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
393	so->so_emu = udptos[i].emu;
394	return udptos[i].tos;
395	}
396	i++;
397	}
398
399	return 0;
400	}
401
402	#ifdef EMULATE_TALK
403	#include "talkd.h"
404	#endif
405
406	/*
407	* Here, talk/ytalk/ntalk requests must be emulated
408	*/
409	void
410	udp_emu(so, m)
411	struct socket *so;
412	struct mbuf *m;
413	{
414	struct sockaddr_in addr;
415	#ifndef VBOX
416	int addrlen = sizeof(addr);
417	#else /* VBOX */
418	socklen_t addrlen = sizeof(addr);
419	#endif /* VBOX */
420	#ifdef EMULATE_TALK
421	CTL_MSG_OLD *omsg;
422	CTL_MSG *nmsg;
423	char buff[sizeof(CTL_MSG)];
424	u_char type;
425
426	struct talk_request {
427	struct talk_request *next;
428	struct socket *udp_so;
429	struct socket *tcp_so;
430	} *req;
431
432	static struct talk_request *req_tbl = 0;
433
434	#endif
435
436	struct cu_header {
437	uint16_t d_family; /* destination family */
438	uint16_t d_port; /* destination port */
439	uint32_t d_addr; /* destination address */
440	uint16_t s_family; /* source family */
441	uint16_t s_port; /* source port */
442	uint32_t so_addr; /* source address */
443	uint32_t seqn; /* sequence number */
444	uint16_t message; /* message */
445	uint16_t data_type; /* data type */
446	uint16_t pkt_len; /* packet length */
447	} *cu_head;
448
449	switch(so->so_emu) {
450
451	#ifdef EMULATE_TALK
452	case EMU_TALK:
453	case EMU_NTALK:
454	/*
455	* Talk emulation. We always change the ctl_addr to get
456	* some answers from the daemon. When an ANNOUNCE comes,
457	* we send LEAVE_INVITE to the local daemons. Also when a
458	* DELETE comes, we send copies to the local daemons.
459	*/
460	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
461	return;
462
463	#define IS_OLD (so->so_emu == EMU_TALK)
464
465	#define COPY_MSG(dest, src) { dest->type = src->type; \
466	dest->id_num = src->id_num; \
467	dest->pid = src->pid; \
468	dest->addr = src->addr; \
469	dest->ctl_addr = src->ctl_addr; \
470	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
471	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
472	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE); }
473
474	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
475	/* old_sockaddr to sockaddr_in */
476
477
478	if (IS_OLD) { /* old talk */
479	omsg = mtod(m, CTL_MSG_OLD*);
480	nmsg = (CTL_MSG *) buff;
481	type = omsg->type;
482	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
483	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
484	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
485	} else { /* new talk */
486	omsg = (CTL_MSG_OLD *) buff;
487	nmsg = mtod(m, CTL_MSG *);
488	type = nmsg->type;
489	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
490	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
491	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
492	}
493
494	if (type == LOOK_UP)
495	return; /* for LOOK_UP this is enough */
496
497	if (IS_OLD) { /* make a copy of the message */
498	COPY_MSG(nmsg, omsg);
499	nmsg->vers = 1;
500	nmsg->answer = 0;
501	} else
502	COPY_MSG(omsg, nmsg);
503
504	/*
505	* If if is an ANNOUNCE message, we go through the
506	* request table to see if a tcp port has already
507	* been redirected for this socket. If not, we solisten()
508	* a new socket and add this entry to the table.
509	* The port number of the tcp socket and our IP
510	* are put to the addr field of the message structures.
511	* Then a LEAVE_INVITE is sent to both local daemon
512	* ports, 517 and 518. This is why we have two copies
513	* of the message, one in old talk and one in new talk
514	* format.
515	*/
516
517	if (type == ANNOUNCE) {
518	int s;
519	u_short temp_port;
520
521	for(req = req_tbl; req; req = req->next)
522	if (so == req->udp_so)
523	break; /* found it */
524
525	if (!req) { /* no entry for so, create new */
526	req = (struct talk_request *)
527	malloc(sizeof(struct talk_request));
528	req->udp_so = so;
529	req->tcp_so = solisten(0,
530	OTOSIN(omsg, addr)->sin_addr.s_addr,
531	OTOSIN(omsg, addr)->sin_port,
532	SS_FACCEPTONCE);
533	req->next = req_tbl;
534	req_tbl = req;
535	}
536
537	/* replace port number in addr field */
538	addrlen = sizeof(addr);
539	getsockname(req->tcp_so->s,
540	(struct sockaddr *) &addr,
541	&addrlen);
542	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
543	OTOSIN(omsg, addr)->sin_addr = our_addr;
544	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
545	OTOSIN(nmsg, addr)->sin_addr = our_addr;
546
547	/* send LEAVE_INVITEs */
548	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
549	OTOSIN(omsg, ctl_addr)->sin_port = 0;
550	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
551	omsg->type = nmsg->type = LEAVE_INVITE;
552
553	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
554	addr.sin_addr = our_addr;
555	addr.sin_family = AF_INET;
556	addr.sin_port = htons(517);
557	sendto(s, (char )omsg, sizeof(omsg), 0,
558	(struct sockaddr *)&addr, sizeof(addr));
559	addr.sin_port = htons(518);
560	sendto(s, (char )nmsg, sizeof(nmsg), 0,
561	(struct sockaddr *) &addr, sizeof(addr));
562	closesocket(s) ;
563
564	omsg->type = nmsg->type = ANNOUNCE;
565	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
566	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
567	}
568
569	/*
570	* If it is a DELETE message, we send a copy to the
571	* local daemons. Then we delete the entry corresponding
572	* to our socket from the request table.
573	*/
574
575	if (type == DELETE) {
576	struct talk_request temp_req, req_next;
577	int s;
578	u_short temp_port;
579
580	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
581	OTOSIN(omsg, ctl_addr)->sin_port = 0;
582	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
583
584	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
585	addr.sin_addr = our_addr;
586	addr.sin_family = AF_INET;
587	addr.sin_port = htons(517);
588	sendto(s, (char )omsg, sizeof(omsg), 0,
589	(struct sockaddr *)&addr, sizeof(addr));
590	addr.sin_port = htons(518);
591	sendto(s, (char )nmsg, sizeof(nmsg), 0,
592	(struct sockaddr *)&addr, sizeof(addr));
593	closesocket(s);
594
595	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
596	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
597
598	/* delete table entry */
599	if (so == req_tbl->udp_so) {
600	temp_req = req_tbl;
601	req_tbl = req_tbl->next;
602	free(temp_req);
603	} else {
604	temp_req = req_tbl;
605	for(req = req_tbl->next; req; req = req_next) {
606	req_next = req->next;
607	if (so == req->udp_so) {
608	temp_req->next = req_next;
609	free(req);
610	break;
611	} else {
612	temp_req = req;
613	}
614	}
615	}
616	}
617
618	return;
619	#endif
620
621	case EMU_CUSEEME:
622
623	/*
624	* Cu-SeeMe emulation.
625	* Hopefully the packet is more that 16 bytes long. We don't
626	* do any other tests, just replace the address and port
627	* fields.
628	*/
629	if (m->m_len >= sizeof (*cu_head)) {
630	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
631	return;
632	cu_head = mtod(m, struct cu_header *);
633	cu_head->s_port = addr.sin_port;
634	cu_head->so_addr = our_addr.s_addr;
635	}
636
637	return;
638	}
639	}
640
641	struct socket *
642	udp_listen(port, laddr, lport, flags)
643	u_int port;
644	u_int32_t laddr;
645	u_int lport;
646	int flags;
647	{
648	struct sockaddr_in addr;
649	struct socket *so;
650	#ifndef VBOX
651	int addrlen = sizeof(struct sockaddr_in), opt = 1;
652	#else /* VBOX */
653	socklen_t addrlen = sizeof(struct sockaddr_in);
654	int opt = 1;
655	#endif /* VBOX */
656
657	if ((so = socreate()) == NULL) {
658	free(so);
659	return NULL;
660	}
661	so->s = socket(AF_INET,SOCK_DGRAM,0);
662	so->so_expire = curtime + SO_EXPIRE;
663	insque(so,&udb);
664
665	addr.sin_family = AF_INET;
666	addr.sin_addr.s_addr = INADDR_ANY;
667	addr.sin_port = port;
668
669	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
670	udp_detach(so);
671	return NULL;
672	}
673	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
674	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
675
676	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
677	so->so_fport = addr.sin_port;
678	if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr)
679	so->so_faddr = alias_addr;
680	else
681	so->so_faddr = addr.sin_addr;
682
683	so->so_lport = lport;
684	so->so_laddr.s_addr = laddr;
685	if (flags != SS_FACCEPTONCE)
686	so->so_expire = 0;
687
688	so->so_state = SS_ISFCONNECTED;
689
690	return so;
691	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 530

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