udp.c@ 16954

Last change on this file since 16954 was 16946, checked in by vboxsync, 16 years ago
NAT: cosmetics
Property svn:eol-style set to `native`
File size: 22.6 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	fd_nonblock(so->s);
369	if (bind(so->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
370	{
371	int lasterrno = errno;
372	closesocket(so->s);
373	so->s = -1;
374	#ifdef RT_OS_WINDOWS
375	WSASetLastError(lasterrno);
376	#else
377	errno = lasterrno;
378	#endif
379	}
380	else
381	{
382	int opt = 1;
383	/* success, insert in queue */
384	so->so_expire = curtime + SO_EXPIRE;
385	/* enable broadcast for later use */
386	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
387	status = getsockname(so->s, &sa_addr, &socklen);
388	Assert(status == 0 && sa_addr.sa_family == AF_INET);
389	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
390	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
391	SOCKET_LOCK_CREATE(so);
392	QSOCKET_LOCK(udb);
393	insque(pData, so,&udb);
394	NSOCK_INC();
395	QSOCKET_UNLOCK(udb);
396	}
397	}
398	else
399	{
400	LogRel(("NAT: can't create datagramm socket\n"));
401	}
402	return so->s;
403	}
404
405	void
406	udp_detach(PNATState pData, struct socket *so)
407	{
408	if (so != &pData->icmp_socket)
409	{
410	QSOCKET_LOCK(udb);
411	SOCKET_LOCK(so);
412	QSOCKET_UNLOCK(udb);
413	closesocket(so->s);
414	sofree(pData, so);
415	SOCKET_UNLOCK(so);
416	}
417	}
418
419	static const struct tos_t udptos[] =
420	{
421	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
422	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
423	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
424	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
425	{ 0, 0, 0, 0 }
426	};
427
428	u_int8_t
429	udp_tos(struct socket *so)
430	{
431	int i = 0;
432
433	while(udptos[i].tos)
434	{
435	if ( (udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport)
436	\|\| (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport))
437	{
438	so->so_emu = udptos[i].emu;
439	return udptos[i].tos;
440	}
441	i++;
442	}
443
444	return 0;
445	}
446
447	#ifdef EMULATE_TALK
448	#include "talkd.h"
449	#endif
450
451	/*
452	* Here, talk/ytalk/ntalk requests must be emulated
453	*/
454	void
455	udp_emu(PNATState pData, struct socket so, struct mbuf m)
456	{
457	struct sockaddr_in addr;
458	socklen_t addrlen = sizeof(addr);
459	#ifdef EMULATE_TALK
460	CTL_MSG_OLD *omsg;
461	CTL_MSG *nmsg;
462	char buff[sizeof(CTL_MSG)];
463	u_char type;
464
465	struct talk_request
466	{
467	struct talk_request *next;
468	struct socket *udp_so;
469	struct socket *tcp_so;
470	} *req;
471
472	static struct talk_request *req_tbl = 0;
473
474	#endif
475
476	struct cu_header
477	{
478	uint16_t d_family; /* destination family */
479	uint16_t d_port; /* destination port */
480	uint32_t d_addr; /* destination address */
481	uint16_t s_family; /* source family */
482	uint16_t s_port; /* source port */
483	uint32_t so_addr; /* source address */
484	uint32_t seqn; /* sequence number */
485	uint16_t message; /* message */
486	uint16_t data_type; /* data type */
487	uint16_t pkt_len; /* packet length */
488	} *cu_head;
489
490	switch(so->so_emu)
491	{
492	#ifdef EMULATE_TALK
493	case EMU_TALK:
494	case EMU_NTALK:
495	/*
496	* Talk emulation. We always change the ctl_addr to get
497	* some answers from the daemon. When an ANNOUNCE comes,
498	* we send LEAVE_INVITE to the local daemons. Also when a
499	* DELETE comes, we send copies to the local daemons.
500	*/
501	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
502	return;
503
504	#define IS_OLD (so->so_emu == EMU_TALK)
505
506	#define COPY_MSG(dest, src) \
507	do { \
508	dest->type = src->type; \
509	dest->id_num = src->id_num; \
510	dest->pid = src->pid; \
511	dest->addr = src->addr; \
512	dest->ctl_addr = src->ctl_addr; \
513	memcpy(&dest->l_name, &src->l_name, NAME_SIZE_OLD); \
514	memcpy(&dest->r_name, &src->r_name, NAME_SIZE_OLD); \
515	memcpy(&dest->r_tty, &src->r_tty, TTY_SIZE);
516	} while (0)
517
518	#define OTOSIN(ptr, field) ((struct sockaddr_in *)&ptr->field)
519	/* old_sockaddr to sockaddr_in */
520
521
522	if (IS_OLD)
523	{
524	/* old talk */
525	omsg = mtod(m, CTL_MSG_OLD*);
526	nmsg = (CTL_MSG *) buff;
527	type = omsg->type;
528	OTOSIN(omsg, ctl_addr)->sin_port = addr.sin_port;
529	OTOSIN(omsg, ctl_addr)->sin_addr = our_addr;
530	strncpy(omsg->l_name, getlogin(), NAME_SIZE_OLD);
531	}
532	else
533	{
534	/* new talk */
535	omsg = (CTL_MSG_OLD *) buff;
536	nmsg = mtod(m, CTL_MSG *);
537	type = nmsg->type;
538	OTOSIN(nmsg, ctl_addr)->sin_port = addr.sin_port;
539	OTOSIN(nmsg, ctl_addr)->sin_addr = our_addr;
540	strncpy(nmsg->l_name, getlogin(), NAME_SIZE_OLD);
541	}
542
543	if (type == LOOK_UP)
544	return; /* for LOOK_UP this is enough */
545
546	if (IS_OLD)
547	{
548	/* make a copy of the message */
549	COPY_MSG(nmsg, omsg);
550	nmsg->vers = 1;
551	nmsg->answer = 0;
552	}
553	else
554	COPY_MSG(omsg, nmsg);
555
556	/*
557	* If if is an ANNOUNCE message, we go through the
558	* request table to see if a tcp port has already
559	* been redirected for this socket. If not, we solisten()
560	* a new socket and add this entry to the table.
561	* The port number of the tcp socket and our IP
562	* are put to the addr field of the message structures.
563	* Then a LEAVE_INVITE is sent to both local daemon
564	* ports, 517 and 518. This is why we have two copies
565	* of the message, one in old talk and one in new talk
566	* format.
567	*/
568
569	if (type == ANNOUNCE)
570	{
571	int s;
572	u_short temp_port;
573
574	for(req = req_tbl; req; req = req->next)
575	if (so == req->udp_so)
576	break; /* found it */
577
578	if (!req)
579	{
580	/* no entry for so, create new */
581	req = (struct talk_request *)RTMemAlloc(sizeof(struct talk_request));
582	req->udp_so = so;
583	req->tcp_so = solisten(0,
584	OTOSIN(omsg, addr)->sin_addr.s_addr,
585	OTOSIN(omsg, addr)->sin_port,
586	SS_FACCEPTONCE);
587	req->next = req_tbl;
588	req_tbl = req;
589	}
590
591	/* replace port number in addr field */
592	addrlen = sizeof(addr);
593	getsockname(req->tcp_so->s, (struct sockaddr *) &addr, &addrlen);
594	OTOSIN(omsg, addr)->sin_port = addr.sin_port;
595	OTOSIN(omsg, addr)->sin_addr = our_addr;
596	OTOSIN(nmsg, addr)->sin_port = addr.sin_port;
597	OTOSIN(nmsg, addr)->sin_addr = our_addr;
598
599	/* send LEAVE_INVITEs */
600	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
601	OTOSIN(omsg, ctl_addr)->sin_port = 0;
602	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
603	omsg->type = nmsg->type = LEAVE_INVITE;
604
605	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
606	addr.sin_addr = our_addr;
607	addr.sin_family = AF_INET;
608	addr.sin_port = htons(517);
609	sendto(s, (char )omsg, sizeof(omsg), 0,
610	(struct sockaddr *)&addr, sizeof(addr));
611	addr.sin_port = htons(518);
612	sendto(s, (char )nmsg, sizeof(nmsg), 0,
613	(struct sockaddr *) &addr, sizeof(addr));
614	closesocket(s) ;
615
616	omsg->type = nmsg->type = ANNOUNCE;
617	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
618	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
619	}
620
621	/*
622	* If it is a DELETE message, we send a copy to the
623	* local daemons. Then we delete the entry corresponding
624	* to our socket from the request table.
625	*/
626
627	if (type == DELETE)
628	{
629	struct talk_request temp_req, req_next;
630	int s;
631	u_short temp_port;
632
633	temp_port = OTOSIN(omsg, ctl_addr)->sin_port;
634	OTOSIN(omsg, ctl_addr)->sin_port = 0;
635	OTOSIN(nmsg, ctl_addr)->sin_port = 0;
636
637	s = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
638	addr.sin_addr = our_addr;
639	addr.sin_family = AF_INET;
640	addr.sin_port = htons(517);
641	sendto(s, (char )omsg, sizeof(omsg), 0,
642	(struct sockaddr *)&addr, sizeof(addr));
643	addr.sin_port = htons(518);
644	sendto(s, (char )nmsg, sizeof(nmsg), 0,
645	(struct sockaddr *)&addr, sizeof(addr));
646	closesocket(s);
647
648	OTOSIN(omsg, ctl_addr)->sin_port = temp_port;
649	OTOSIN(nmsg, ctl_addr)->sin_port = temp_port;
650
651	/* delete table entry */
652	if (so == req_tbl->udp_so)
653	{
654	temp_req = req_tbl;
655	req_tbl = req_tbl->next;
656	RTMemFree(temp_req);
657	}
658	else
659	{
660	temp_req = req_tbl;
661	for (req = req_tbl->next; req; req = req_next)
662	{
663	req_next = req->next;
664	if (so == req->udp_so)
665	{
666	temp_req->next = req_next;
667	RTMemFree(req);
668	break;
669	}
670	else
671	temp_req = req;
672	}
673	}
674	}
675
676	return;
677	#endif
678
679	case EMU_CUSEEME:
680	/*
681	* Cu-SeeMe emulation.
682	* Hopefully the packet is more that 16 bytes long. We don't
683	* do any other tests, just replace the address and port
684	* fields.
685	*/
686	if (m->m_len >= sizeof (*cu_head))
687	{
688	if (getsockname(so->s, (struct sockaddr *)&addr, &addrlen) < 0)
689	return;
690	cu_head = mtod(m, struct cu_header *);
691	cu_head->s_port = addr.sin_port;
692	cu_head->so_addr = our_addr.s_addr;
693	}
694	return;
695	}
696	}
697
698	struct socket *
699	udp_listen(PNATState pData, u_int port, u_int32_t laddr, u_int lport, int flags)
700	{
701	struct sockaddr_in addr;
702	struct socket *so;
703	socklen_t addrlen = sizeof(struct sockaddr_in);
704	int opt = 1;
705
706	if ((so = socreate()) == NULL)
707	return NULL;
708
709	so->s = socket(AF_INET,SOCK_DGRAM,0);
710	if (so->s == -1)
711	{
712	LogRel(("NAT: can't create datagram socket\n"));
713	RTMemFree(so);
714	return NULL;
715	}
716	so->so_expire = curtime + SO_EXPIRE;
717	fd_nonblock(so->s);
718	SOCKET_LOCK_CREATE(so);
719	QSOCKET_LOCK(udb);
720	insque(pData, so,&udb);
721	NSOCK_INC();
722	QSOCKET_UNLOCK(udb);
723
724	addr.sin_family = AF_INET;
725	addr.sin_addr.s_addr = INADDR_ANY;
726	addr.sin_port = port;
727
728	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
729	{
730	udp_detach(pData, so);
731	return NULL;
732	}
733	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
734	/* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char )&opt,sizeof(int)); /
735
736	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
737	so->so_fport = addr.sin_port;
738	/* The original check was completely broken, as the commented out
739	* if statement was always true (INADDR_ANY=0). */
740	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
741	if (1 == 0) /* always use the else part */
742	so->so_faddr = alias_addr;
743	else
744	so->so_faddr = addr.sin_addr;
745
746	so->so_lport = lport;
747	so->so_laddr.s_addr = laddr;
748	if (flags != SS_FACCEPTONCE)
749	so->so_expire = 0;
750
751	so->so_state = SS_ISFCONNECTED;
752
753	return so;
754	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 16954

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