udp.c@ 16684

Last change on this file since 16684 was 16562, checked in by vboxsync, 16 years ago
NAT:NSOK_INC/DEC added to count sockets number for allocation enough pollfd buffer (and latter epoll_event (for Linux only)).
Property svn:eol-style set to `native`
File size: 22.4 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	#include "ctl.h"
48
49
50	/*
51	* UDP protocol implementation.
52	* Per RFC 768, August, 1980.
53	*/
54	#define udpcksum 1
55
56	void
57	udp_init(PNATState pData)
58	{
59	udp_last_so = &udb;
60	udb.so_next = udb.so_prev = &udb;
61	}
62
63	/* m->m_data points at ip packet header
64	* m->m_len length ip packet
65	* ip->ip_len length data (IPDU)
66	*/
67	void
68	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
69	{
70	register struct ip *ip;
71	register struct udphdr *uh;
72	int len;
73	struct ip save_ip;
74	struct socket *so;
75	int ret;
76	int ttl;
77
78	DEBUG_CALL("udp_input");
79	DEBUG_ARG("m = %lx", (long)m);
80	DEBUG_ARG("iphlen = %d", iphlen);
81
82	udpstat.udps_ipackets++;
83
84	/*
85	* Strip IP options, if any; should skip this,
86	* make available to user, and use on returned packets,
87	* but we don't yet have a way to check the checksum
88	* with options still present.
89	*/
90	if (iphlen > sizeof(struct ip))
91	{
92	ip_stripoptions(m, (struct mbuf *)0);
93	iphlen = sizeof(struct ip);
94	}
95
96	/*
97	* Get IP and UDP header together in first mbuf.
98	*/
99	ip = mtod(m, struct ip *);
100	uh = (struct udphdr *)((caddr_t)ip + iphlen);
101
102	/*
103	* Make mbuf data length reflect UDP length.
104	* If not enough data to reflect UDP length, drop.
105	*/
106	len = ntohs((u_int16_t)uh->uh_ulen);
107
108	if (ip->ip_len != len)
109	{
110	if (len > ip->ip_len)
111	{
112	udpstat.udps_badlen++;
113	goto bad;
114	}
115	m_adj(m, len - ip->ip_len);
116	ip->ip_len = len;
117	}
118
119	/*
120	* Save a copy of the IP header in case we want restore it
121	* for sending an ICMP error message in response.
122	*/
123	save_ip = *ip;
124	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
125
126	/*
127	* Checksum extended UDP header and data.
128	*/
129	if (udpcksum && uh->uh_sum)
130	{
131	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
132	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
133	#if 0
134	/* keep uh_sum for ICMP reply */
135	uh->uh_sum = cksum(m, len + sizeof (struct ip));
136	if (uh->uh_sum)
137	{
138
139	#endif
140	if(cksum(m, len + sizeof(struct ip)))
141	{
142	udpstat.udps_badsum++;
143	goto bad;
144	}
145	}
146	#if 0
147	}
148	#endif
149
150	/*
151	* handle DHCP/BOOTP
152	*/
153	if (ntohs(uh->uh_dport) == BOOTP_SERVER)
154	{
155	bootp_input(pData, m);
156	goto bad;
157	}
158
159	/*
160	* handle TFTP
161	*/
162	if ( ntohs(uh->uh_dport) == TFTP_SERVER
163	&& CTL_CHECK(ntohl(ip->ip_dst.s_addr), CTL_TFTP))
164	{
165	tftp_input(pData, m);
166	goto bad;
167	}
168
169	/*
170	* Locate pcb for datagram.
171	*/
172	so = udp_last_so;
173	if ( so->so_lport != uh->uh_sport
174	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
175	{
176	struct socket *tmp;
177
178	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
179	{
180	if ( tmp->so_lport == uh->uh_sport
181	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
182	{
183	so = tmp;
184	break;
185	}
186	}
187	if (tmp == &udb)
188	so = NULL;
189	else
190	{
191	udpstat.udpps_pcbcachemiss++;
192	udp_last_so = so;
193	}
194	}
195
196	if (so == NULL)
197	{
198	/*
199	* If there's no socket for this packet,
200	* create one
201	*/
202	if ((so = socreate()) == NULL)
203	goto bad;
204	if (udp_attach(pData, so) == -1)
205	{
206	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
207	errno,strerror(errno)));
208	sofree(pData, so);
209	goto bad;
210	}
211
212	/*
213	* Setup fields
214	*/
215	/* udp_last_so = so; */
216	so->so_laddr = ip->ip_src;
217	so->so_lport = uh->uh_sport;
218
219	if ((so->so_iptos = udp_tos(so)) == 0)
220	so->so_iptos = ip->ip_tos;
221
222	/*
223	* XXXXX Here, check if it's in udpexec_list,
224	* and if it is, do the fork_exec() etc.
225	*/
226	}
227
228	so->so_faddr = ip->ip_dst; /* XXX */
229	so->so_fport = uh->uh_dport; /* XXX */
230
231	iphlen += sizeof(struct udphdr);
232	m->m_len -= iphlen;
233	m->m_data += iphlen;
234
235	/*
236	* Now we sendto() the packet.
237	*/
238	if (so->so_emu)
239	udp_emu(pData, so, m);
240
241	ttl = ip->ip_ttl = save_ip.ip_ttl;
242	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
243	if (ret < 0)
244	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
245	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
246
247	if (sosendto(pData, so, m) == -1)
248	{
249	m->m_len += iphlen;
250	m->m_data -= iphlen;
251	*ip = save_ip;
252	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n", errno, strerror(errno)));
253	icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0, strerror(errno));
254	}
255
256	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
257
258	/* restore the orig mbuf packet */
259	m->m_len += iphlen;
260	m->m_data -= iphlen;
261	*ip = save_ip;
262	so->so_m = m; /* ICMP backup */
263
264	return;
265
266	bad:
267	m_freem(pData, m);
268	return;
269	}
270
271	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
272	struct sockaddr_in saddr, struct sockaddr_in daddr,
273	int iptos)
274	{
275	register struct udpiphdr *ui;
276	int error = 0;
277
278	DEBUG_CALL("udp_output");
279	DEBUG_ARG("so = %lx", (long)so);
280	DEBUG_ARG("m = %lx", (long)m);
281	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
282	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
283
284	/*
285	* Adjust for header
286	*/
287	m->m_data -= sizeof(struct udpiphdr);
288	m->m_len += sizeof(struct udpiphdr);
289
290	/*
291	* Fill in mbuf with extended UDP header
292	* and addresses and length put into network format.
293	*/
294	ui = mtod(m, struct udpiphdr *);
295	memset(ui->ui_x1, 0, 9);
296	ui->ui_pr = IPPROTO_UDP;
297	ui->ui_len = htons(m->m_len - sizeof(struct ip)); /* + sizeof (struct udphdr)); */
298	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
299	ui->ui_src = saddr->sin_addr;
300	ui->ui_dst = daddr->sin_addr;
301	ui->ui_sport = saddr->sin_port;
302	ui->ui_dport = daddr->sin_port;
303	ui->ui_ulen = ui->ui_len;
304
305	/*
306	* Stuff checksum and output datagram.
307	*/
308	ui->ui_sum = 0;
309	if (udpcksum)
310	{
311	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
312	ui->ui_sum = 0xffff;
313	}
314	((struct ip *)ui)->ip_len = m->m_len;
315	((struct ip *)ui)->ip_ttl = ip_defttl;
316	((struct ip *)ui)->ip_tos = iptos;
317
318	udpstat.udps_opackets++;
319
320	error = ip_output(pData, so, m);
321
322	return error;
323	}
324
325	int udp_output(PNATState pData, struct socket so, struct mbuf m,
326	struct sockaddr_in *addr)
327	{
328	struct sockaddr_in saddr, daddr;
329
330	saddr = *addr;
331	if ((so->so_faddr.s_addr & htonl(pData->netmask)) == special_addr.s_addr)
332	{
333	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
334	if ((so->so_faddr.s_addr & htonl(~pData->netmask)) == htonl(~pData->netmask))
335	saddr.sin_addr.s_addr = alias_addr.s_addr;
336	}
337
338	/* Any UDP packet to the loopback address must be translated to be from
339	* the forwarding address, i.e. 10.0.2.2. */
340	if ( (saddr.sin_addr.s_addr & htonl(IN_CLASSA_NET))
341	== htonl(INADDR_LOOPBACK & IN_CLASSA_NET))
342	saddr.sin_addr.s_addr = alias_addr.s_addr;
343
344	daddr.sin_addr = so->so_laddr;
345	daddr.sin_port = so->so_lport;
346
347	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
348	}
349
350	int
351	udp_attach(PNATState pData, struct socket *so)
352	{
353	struct sockaddr_in addr;
354	struct sockaddr sa_addr;
355	socklen_t socklen = sizeof(struct sockaddr);
356	int status;
357
358	if ((so->s = socket(AF_INET,SOCK_DGRAM,0)) != -1)
359	{
360	/*
361	* Here, we bind() the socket. Although not really needed
362	* (sendto() on an unbound socket will bind it), it's done
363	* here so that emulation of ytalk etc. don't have to do it
364	*/
365	addr.sin_family = AF_INET;
366	addr.sin_port = 0;
367	addr.sin_addr.s_addr = INADDR_ANY;
368	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
369	{
370	int lasterrno = errno;
371	closesocket(so->s);
372	so->s = -1;
373	#ifdef RT_OS_WINDOWS
374	WSASetLastError(lasterrno);
375	#else
376	errno = lasterrno;
377	#endif
378	}
379	else
380	{
381	int opt = 1;
382	/* success, insert in queue */
383	so->so_expire = curtime + SO_EXPIRE;
384	/* enable broadcast for later use */
385	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
386	status = getsockname(so->s, &sa_addr, &socklen);
387	Assert(status == 0 && sa_addr.sa_family == AF_INET);
388	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
389	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
390	SOCKET_LOCK_CREATE(so);
391	QSOCKET_LOCK(udb);
392	insque(pData, so,&udb);
393	NSOCK_INC();
394	QSOCKET_UNLOCK(udb);
395	}
396	}
397	return so->s;
398	}
399
400	void
401	udp_detach(PNATState pData, struct socket *so)
402	{
403	if (so != &pData->icmp_socket)
404	{
405	QSOCKET_LOCK(udb);
406	SOCKET_LOCK(so);
407	QSOCKET_UNLOCK(udb);
408	closesocket(so->s);
409	sofree(pData, so);
410	SOCKET_UNLOCK(so);
411	}
412	}
413
414	static const struct tos_t udptos[] =
415	{
416	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
417	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
418	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
419	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
420	{ 0, 0, 0, 0 }
421	};
422
423	u_int8_t
424	udp_tos(struct socket *so)
425	{
426	int i = 0;
427
428	while(udptos[i].tos)
429	{
430	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
431	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
432	{
433	so->so_emu = udptos[i].emu;
434	return udptos[i].tos;
435	}
436	i++;
437	}
438
439	return 0;
440	}
441
442	#ifdef EMULATE_TALK
443	#include "talkd.h"
444	#endif
445
446	/*
447	* Here, talk/ytalk/ntalk requests must be emulated
448	*/
449	void
450	udp_emu(PNATState pData, struct socket so, struct mbuf m)
451	{
452	struct sockaddr_in addr;
453	socklen_t addrlen = sizeof(addr);
454	#ifdef EMULATE_TALK
455	CTL_MSG_OLD *omsg;
456	CTL_MSG *nmsg;
457	char buff[sizeof(CTL_MSG)];
458	u_char type;
459
460	struct talk_request
461	{
462	struct talk_request *next;
463	struct socket *udp_so;
464	struct socket *tcp_so;
465	} *req;
466
467	static struct talk_request *req_tbl = 0;
468
469	#endif
470
471	struct cu_header
472	{
473	uint16_t d_family; /* destination family */
474	uint16_t d_port; /* destination port */
475	uint32_t d_addr; /* destination address */
476	uint16_t s_family; /* source family */
477	uint16_t s_port; /* source port */
478	uint32_t so_addr; /* source address */
479	uint32_t seqn; /* sequence number */
480	uint16_t message; /* message */
481	uint16_t data_type; /* data type */
482	uint16_t pkt_len; /* packet length */
483	} *cu_head;
484
485	switch(so->so_emu)
486	{
487	#ifdef EMULATE_TALK
488	case EMU_TALK:
489	case EMU_NTALK:
490	/*
491	* Talk emulation. We always change the ctl_addr to get
492	* some answers from the daemon. When an ANNOUNCE comes,
493	* we send LEAVE_INVITE to the local daemons. Also when a
494	* DELETE comes, we send copies to the local daemons.
495	*/
496	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
497	return;
498
499	#define IS_OLD (so->so_emu == EMU_TALK)
500
501	#define COPY_MSG(dest, src) \
502	do { \
503	dest->type = src->type; \
504	dest->id_num = src->id_num; \
505	dest->pid = src->pid; \
506	dest->addr = src->addr; \
507	dest->ctl_addr = src->ctl_addr; \
508	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
509	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
510	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
511	} while (0)
512
513	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
514	/* old_sockaddr to sockaddr_in */
515
516
517	if (IS_OLD)
518	{
519	/* old talk */
520	omsg = mtod(m, CTL_MSG_OLD*);
521	nmsg = (CTL_MSG *) buff;
522	type = omsg->type;
523	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
524	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
525	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
526	}
527	else
528	{
529	/* new talk */
530	omsg = (CTL_MSG_OLD *) buff;
531	nmsg = mtod(m, CTL_MSG *);
532	type = nmsg->type;
533	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
534	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
535	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
536	}
537
538	if (type == LOOK_UP)
539	return; /* for LOOK_UP this is enough */
540
541	if (IS_OLD)
542	{
543	/* make a copy of the message */
544	COPY_MSG(nmsg, omsg);
545	nmsg->vers = 1;
546	nmsg->answer = 0;
547	}
548	else
549	COPY_MSG(omsg, nmsg);
550
551	/*
552	* If if is an ANNOUNCE message, we go through the
553	* request table to see if a tcp port has already
554	* been redirected for this socket. If not, we solisten()
555	* a new socket and add this entry to the table.
556	* The port number of the tcp socket and our IP
557	* are put to the addr field of the message structures.
558	* Then a LEAVE_INVITE is sent to both local daemon
559	* ports, 517 and 518. This is why we have two copies
560	* of the message, one in old talk and one in new talk
561	* format.
562	*/
563
564	if (type == ANNOUNCE)
565	{
566	int s;
567	u_short temp_port;
568
569	for(req = req_tbl; req; req = req->next)
570	if (so == req->udp_so)
571	break; /* found it */
572
573	if (!req)
574	{
575	/* no entry for so, create new */
576	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
577	req->udp_so = so;
578	req->tcp_so = solisten(0,
579	OTOSIN(omsg, addr)->sin_addr.s_addr,
580	OTOSIN(omsg, addr)->sin_port,
581	SS_FACCEPTONCE);
582	req->next = req_tbl;
583	req_tbl = req;
584	}
585
586	/* replace port number in addr field */
587	addrlen = sizeof(addr);
588	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
589	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
590	OTOSIN(omsg, addr)->sin_addr = our_addr;
591	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
592	OTOSIN(nmsg, addr)->sin_addr = our_addr;
593
594	/* send LEAVE_INVITEs */
595	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
596	OTOSIN(omsg, ctl_addr)->sin_port = 0;
597	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
598	omsg->type = nmsg->type = LEAVE_INVITE;
599
600	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
601	addr.sin_addr = our_addr;
602	addr.sin_family = AF_INET;
603	addr.sin_port = htons(517);
604	sendto(s, (char )omsg, sizeof(omsg), 0,
605	(struct sockaddr *)&addr, sizeof(addr));
606	addr.sin_port = htons(518);
607	sendto(s, (char )nmsg, sizeof(nmsg), 0,
608	(struct sockaddr *) &addr, sizeof(addr));
609	closesocket(s) ;
610
611	omsg->type = nmsg->type = ANNOUNCE;
612	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
613	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
614	}
615
616	/*
617	* If it is a DELETE message, we send a copy to the
618	* local daemons. Then we delete the entry corresponding
619	* to our socket from the request table.
620	*/
621
622	if (type == DELETE)
623	{
624	struct talk_request temp_req, req_next;
625	int s;
626	u_short temp_port;
627
628	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
629	OTOSIN(omsg, ctl_addr)->sin_port = 0;
630	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
631
632	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
633	addr.sin_addr = our_addr;
634	addr.sin_family = AF_INET;
635	addr.sin_port = htons(517);
636	sendto(s, (char )omsg, sizeof(omsg), 0,
637	(struct sockaddr *)&addr, sizeof(addr));
638	addr.sin_port = htons(518);
639	sendto(s, (char )nmsg, sizeof(nmsg), 0,
640	(struct sockaddr *)&addr, sizeof(addr));
641	closesocket(s);
642
643	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
644	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
645
646	/* delete table entry */
647	if (so == req_tbl->udp_so)
648	{
649	temp_req = req_tbl;
650	req_tbl = req_tbl->next;
651	RTMemFree(temp_req);
652	}
653	else
654	{
655	temp_req = req_tbl;
656	for (req = req_tbl->next; req; req = req_next)
657	{
658	req_next = req->next;
659	if (so == req->udp_so)
660	{
661	temp_req->next = req_next;
662	RTMemFree(req);
663	break;
664	}
665	else
666	temp_req = req;
667	}
668	}
669	}
670
671	return;
672	#endif
673
674	case EMU_CUSEEME:
675	/*
676	* Cu-SeeMe emulation.
677	* Hopefully the packet is more that 16 bytes long. We don't
678	* do any other tests, just replace the address and port
679	* fields.
680	*/
681	if (m->m_len >= sizeof (*cu_head))
682	{
683	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
684	return;
685	cu_head = mtod(m, struct cu_header *);
686	cu_head->s_port = addr.sin_port;
687	cu_head->so_addr = our_addr.s_addr;
688	}
689	return;
690	}
691	}
692
693	struct socket *
694	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
695	{
696	struct sockaddr_in addr;
697	struct socket *so;
698	socklen_t addrlen = sizeof(struct sockaddr_in);
699	int opt = 1;
700
701	if ((so = socreate()) == NULL)
702	return NULL;
703
704	so->s = socket(AF_INET,SOCK_DGRAM,0);
705	so->so_expire = curtime + SO_EXPIRE;
706	SOCKET_LOCK_CREATE(so);
707	QSOCKET_LOCK(udb);
708	insque(pData, so,&udb);
709	NSOCK_INC();
710	QSOCKET_UNLOCK(udb);
711
712	addr.sin_family = AF_INET;
713	addr.sin_addr.s_addr = INADDR_ANY;
714	addr.sin_port = port;
715
716	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
717	{
718	udp_detach(pData, so);
719	return NULL;
720	}
721	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
722	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
723
724	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
725	so->so_fport = addr.sin_port;
726	/* The original check was completely broken, as the commented out
727	* if statement was always true (INADDR_ANY=0). */
728	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
729	if (1 == 0) /* always use the else part */
730	so->so_faddr = alias_addr;
731	else
732	so->so_faddr = addr.sin_addr;
733
734	so->so_lport = lport;
735	so->so_laddr.s_addr = laddr;
736	if (flags != SS_FACCEPTONCE)
737	so->so_expire = 0;
738
739	so->so_state = SS_ISFCONNECTED;
740
741	return so;
742	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 16684

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