udp.c@ 37808

Last change on this file since 37808 was 37746, checked in by vboxsync, 14 years ago
NAT/debug: %R[naipv4] -> %RTnaipv4 and &IP -> IP.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 15.7 KB

Line
1	/* $Id: udp.c 37746 2011-07-04 06:07:37Z vboxsync $ */
2	/** @file
3	* NAT - UDP protocol.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*
19	* This code is based on:
20	*
21	* Copyright (c) 1982, 1986, 1988, 1990, 1993
22	* The Regents of the University of California. All rights reserved.
23	*
24	* Redistribution and use in source and binary forms, with or without
25	* modification, are permitted provided that the following conditions
26	* are met:
27	* 1. Redistributions of source code must retain the above copyright
28	* notice, this list of conditions and the following disclaimer.
29	* 2. Redistributions in binary form must reproduce the above copyright
30	* notice, this list of conditions and the following disclaimer in the
31	* documentation and/or other materials provided with the distribution.
32	* 3. All advertising materials mentioning features or use of this software
33	* must display the following acknowledgement:
34	* This product includes software developed by the University of
35	* California, Berkeley and its contributors.
36	* 4. Neither the name of the University nor the names of its contributors
37	* may be used to endorse or promote products derived from this software
38	* without specific prior written permission.
39	*
40	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
41	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
44	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50	* SUCH DAMAGE.
51	*
52	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
53	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
54	*/
55
56	/*
57	* Changes and additions relating to SLiRP
58	* Copyright (c) 1995 Danny Gasparovski.
59	*
60	* Please read the file COPYRIGHT for the
61	* terms and conditions of the copyright.
62	*/
63
64	#include <slirp.h>
65	#include "ip_icmp.h"
66	#include "ctl.h"
67
68
69	/*
70	* UDP protocol implementation.
71	* Per RFC 768, August, 1980.
72	*/
73	#define udpcksum 1
74
75	void
76	udp_init(PNATState pData)
77	{
78	udp_last_so = &udb;
79	udb.so_next = udb.so_prev = &udb;
80	}
81
82	/* m->m_data points at ip packet header
83	* m->m_len length ip packet
84	* ip->ip_len length data (IPDU)
85	*/
86	void
87	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
88	{
89	register struct ip *ip;
90	register struct udphdr *uh;
91	int len;
92	struct ip save_ip;
93	struct socket *so;
94	int ret;
95	int ttl;
96
97	LogFlow(("udp_input: m = %lx, iphlen = %d\n", (long)m, iphlen));
98	ip = mtod(m, struct ip *);
99	Log2(("%RTnaipv4 iphlen = %d\n", ip->ip_dst, iphlen));
100
101	udpstat.udps_ipackets++;
102
103	/*
104	* Strip IP options, if any; should skip this,
105	* make available to user, and use on returned packets,
106	* but we don't yet have a way to check the checksum
107	* with options still present.
108	*/
109	if (iphlen > sizeof(struct ip))
110	{
111	ip_stripoptions(m, (struct mbuf *)0);
112	iphlen = sizeof(struct ip);
113	}
114
115	/*
116	* Get IP and UDP header together in first mbuf.
117	*/
118	ip = mtod(m, struct ip *);
119	uh = (struct udphdr *)((caddr_t)ip + iphlen);
120
121	/*
122	* Make mbuf data length reflect UDP length.
123	* If not enough data to reflect UDP length, drop.
124	*/
125	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
126	Assert((ip->ip_len == len));
127	Assert((ip->ip_len + iphlen == m_length(m, NULL)));
128
129	if (ip->ip_len != len)
130	{
131	if (len > ip->ip_len)
132	{
133	udpstat.udps_badlen++;
134	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
135	}
136	m_adj(m, len - ip->ip_len);
137	ip->ip_len = len;
138	}
139
140	/*
141	* Save a copy of the IP header in case we want restore it
142	* for sending an ICMP error message in response.
143	*/
144	save_ip = *ip;
145	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
146
147	/*
148	* Checksum extended UDP header and data.
149	*/
150	if (udpcksum && uh->uh_sum)
151	{
152	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
153	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
154	#if 0
155	/* keep uh_sum for ICMP reply */
156	uh->uh_sum = cksum(m, len + sizeof (struct ip));
157	if (uh->uh_sum)
158	{
159
160	#endif
161	if (cksum(m, len + iphlen))
162	{
163	udpstat.udps_badsum++;
164	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
165	goto bad_free_mbuf;
166	}
167	}
168	#if 0
169	}
170	#endif
171
172	/*
173	* handle DHCP/BOOTP
174	*/
175	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
176	{
177	bootp_input(pData, m);
178	goto done_free_mbuf;
179	}
180
181	if ( pData->fUseHostResolver
182	&& uh->uh_dport == RT_H2N_U16_C(53)
183	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_DNS))
184	{
185	struct sockaddr_in dst, src;
186	src.sin_addr.s_addr = ip->ip_dst.s_addr;
187	src.sin_port = uh->uh_dport;
188	dst.sin_addr.s_addr = ip->ip_src.s_addr;
189	dst.sin_port = uh->uh_sport;
190
191	slirpMbufTagService(pData, m, CTL_DNS);
192	/* udp_output2() expects a pointer to the body of UDP packet. */
193	m->m_data += sizeof(struct udpiphdr);
194	m->m_len -= sizeof(struct udpiphdr);
195	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
196	return;
197	}
198	/*
199	* handle TFTP
200	*/
201	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
202	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_TFTP))
203	{
204	tftp_input(pData, m);
205	goto done_free_mbuf;
206	}
207
208	/*
209	* Locate pcb for datagram.
210	*/
211	so = udp_last_so;
212	if ( so->so_lport != uh->uh_sport
213	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
214	{
215	struct socket *tmp;
216
217	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
218	{
219	if ( tmp->so_lport == uh->uh_sport
220	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
221	{
222	so = tmp;
223	break;
224	}
225	}
226	if (tmp == &udb)
227	so = NULL;
228	else
229	{
230	udpstat.udpps_pcbcachemiss++;
231	udp_last_so = so;
232	}
233	}
234
235	if (so == NULL)
236	{
237	/*
238	* If there's no socket for this packet,
239	* create one
240	*/
241	if ((so = socreate()) == NULL)
242	{
243	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
244	goto bad_free_mbuf;
245	}
246	if (udp_attach(pData, so, 0) == -1)
247	{
248	Log2(("NAT: IP(id: %hd) udp_attach errno = %d (%s)\n",
249	ip->ip_id, errno, strerror(errno)));
250	sofree(pData, so);
251	goto bad_free_mbuf;
252	}
253
254	/*
255	* Setup fields
256	*/
257	/* udp_last_so = so; */
258	so->so_laddr = ip->ip_src;
259	so->so_lport = uh->uh_sport;
260
261	so->so_iptos = ip->ip_tos;
262
263	/*
264	* XXXXX Here, check if it's in udpexec_list,
265	* and if it is, do the fork_exec() etc.
266	*/
267	}
268
269	so->so_faddr = ip->ip_dst; /* XXX */
270	so->so_fport = uh->uh_dport; /* XXX */
271
272	/*
273	* DNS proxy
274	*/
275	if ( pData->fUseDnsProxy
276	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
277	&& (uh->uh_dport == RT_H2N_U16_C(53)))
278	{
279	dnsproxy_query(pData, so, m, iphlen);
280	goto done_free_mbuf;
281	}
282
283	iphlen += sizeof(struct udphdr);
284	m->m_len -= iphlen;
285	m->m_data += iphlen;
286
287	ttl = ip->ip_ttl = save_ip.ip_ttl;
288	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
289	if (ret < 0)
290	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
291	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
292
293	if (sosendto(pData, so, m) == -1)
294	{
295	m->m_len += iphlen;
296	m->m_data -= iphlen;
297	*ip = save_ip;
298	Log2(("NAT: UDP tx errno = %d (%s) on sent to %RTnaipv4\n",
299	errno, strerror(errno), ip->ip_dst));
300	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
301	so->so_m = NULL;
302	return;
303	}
304
305	if (so->so_m)
306	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
307
308	/* restore the orig mbuf packet */
309	m->m_len += iphlen;
310	m->m_data -= iphlen;
311	*ip = save_ip;
312	so->so_m = m; /* ICMP backup */
313	return;
314
315	bad_free_mbuf:
316	Log2(("NAT: UDP(id: %hd) datagram to %RTnaipv4 with size(%d) claimed as bad\n",
317	ip->ip_id, &ip->ip_dst, ip->ip_len));
318
319	done_free_mbuf:
320	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
321	* and create new m'buffers to send them to guest, so we'll free their incomming
322	* buffers here.
323	*/
324	m_freem(pData, m);
325	return;
326	}
327
328	/**
329	* Output a UDP packet.
330	*
331	* @note This function will finally free m!
332	*/
333	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
334	struct sockaddr_in saddr, struct sockaddr_in daddr,
335	int iptos)
336	{
337	register struct udpiphdr *ui;
338	int error;
339	int mlen = 0;
340
341	LogFlow(("udp_output: so = %lx, m = %lx, saddr = %lx, daddr = %lx\n",
342	(long)so, (long)m, (long)saddr->sin_addr.s_addr, (long)daddr->sin_addr.s_addr));
343
344	/*
345	* Adjust for header
346	*/
347	m->m_data -= sizeof(struct udpiphdr);
348	m->m_len += sizeof(struct udpiphdr);
349	mlen = m_length(m, NULL);
350
351	/*
352	* Fill in mbuf with extended UDP header
353	* and addresses and length put into network format.
354	*/
355	ui = mtod(m, struct udpiphdr *);
356	memset(ui->ui_x1, 0, 9);
357	ui->ui_pr = IPPROTO_UDP;
358	ui->ui_len = RT_H2N_U16(mlen - sizeof(struct ip));
359	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
360	ui->ui_src = saddr->sin_addr;
361	ui->ui_dst = daddr->sin_addr;
362	ui->ui_sport = saddr->sin_port;
363	ui->ui_dport = daddr->sin_port;
364	ui->ui_ulen = ui->ui_len;
365
366	/*
367	* Stuff checksum and output datagram.
368	*/
369	ui->ui_sum = 0;
370	if (udpcksum)
371	{
372	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ mlen)) == 0)
373	ui->ui_sum = 0xffff;
374	}
375	((struct ip *)ui)->ip_len = mlen;
376	((struct ip *)ui)->ip_ttl = ip_defttl;
377	((struct ip *)ui)->ip_tos = iptos;
378
379	udpstat.udps_opackets++;
380
381	error = ip_output(pData, so, m);
382
383	return error;
384	}
385
386	/**
387	* @note This function will free m!
388	*/
389	int udp_output(PNATState pData, struct socket so, struct mbuf m,
390	struct sockaddr_in *addr)
391	{
392	struct sockaddr_in saddr, daddr;
393
394	saddr = *addr;
395	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
396	{
397	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
398	if ((so->so_faddr.s_addr & RT_H2N_U32(~pData->netmask)) == RT_H2N_U32(~pData->netmask))
399	saddr.sin_addr.s_addr = alias_addr.s_addr;
400	}
401
402	/* Any UDP packet to the loopback address must be translated to be from
403	* the forwarding address, i.e. 10.0.2.2. */
404	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
405	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
406	saddr.sin_addr.s_addr = alias_addr.s_addr;
407
408	daddr.sin_addr = so->so_laddr;
409	daddr.sin_port = so->so_lport;
410
411	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
412	}
413
414	int
415	udp_attach(PNATState pData, struct socket *so, int service_port)
416	{
417	struct sockaddr_in *addr;
418	struct sockaddr sa_addr;
419	socklen_t socklen = sizeof(struct sockaddr);
420	int status;
421	int opt = 1;
422
423	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
424	goto error;
425	/*
426	* Here, we bind() the socket. Although not really needed
427	* (sendto() on an unbound socket will bind it), it's done
428	* here so that emulation of ytalk etc. don't have to do it
429	*/
430	memset(&sa_addr, 0, sizeof(struct sockaddr));
431	addr = (struct sockaddr_in *)&sa_addr;
432	#ifdef RT_OS_DARWIN
433	addr->sin_len = sizeof(struct sockaddr_in);
434	#endif
435	addr->sin_family = AF_INET;
436	addr->sin_port = service_port;
437	addr->sin_addr.s_addr = pData->bindIP.s_addr;
438	fd_nonblock(so->s);
439	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
440	{
441	int lasterrno = errno;
442	closesocket(so->s);
443	so->s = -1;
444	#ifdef RT_OS_WINDOWS
445	WSASetLastError(lasterrno);
446	#else
447	errno = lasterrno;
448	#endif
449	goto error;
450	}
451	/* success, insert in queue */
452	so->so_expire = curtime + SO_EXPIRE;
453	/* enable broadcast for later use */
454	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
455	status = getsockname(so->s, &sa_addr, &socklen);
456	Assert(status == 0 && sa_addr.sa_family == AF_INET);
457	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
458	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
459	SOCKET_LOCK_CREATE(so);
460	QSOCKET_LOCK(udb);
461	insque(pData, so, &udb);
462	NSOCK_INC();
463	QSOCKET_UNLOCK(udb);
464	return so->s;
465	error:
466	Log2(("NAT: can't create datagramm socket\n"));
467	return -1;
468	}
469
470	void
471	udp_detach(PNATState pData, struct socket *so)
472	{
473	if (so != &pData->icmp_socket)
474	{
475	QSOCKET_LOCK(udb);
476	SOCKET_LOCK(so);
477	QSOCKET_UNLOCK(udb);
478	closesocket(so->s);
479	sofree(pData, so);
480	SOCKET_UNLOCK(so);
481	}
482	}
483
484	struct socket *
485	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
486	{
487	struct sockaddr_in addr;
488	struct socket *so;
489	socklen_t addrlen = sizeof(struct sockaddr_in);
490	int opt = 1;
491
492	if ((so = socreate()) == NULL)
493	return NULL;
494
495	so->s = socket(AF_INET, SOCK_DGRAM, 0);
496	if (so->s == -1)
497	{
498	LogRel(("NAT: can't create datagram socket\n"));
499	RTMemFree(so);
500	return NULL;
501	}
502	so->so_expire = curtime + SO_EXPIRE;
503	fd_nonblock(so->s);
504	SOCKET_LOCK_CREATE(so);
505	QSOCKET_LOCK(udb);
506	insque(pData, so, &udb);
507	NSOCK_INC();
508	QSOCKET_UNLOCK(udb);
509
510	memset(&addr, 0, sizeof(addr));
511	#ifdef RT_OS_DARWIN
512	addr.sin_len = sizeof(addr);
513	#endif
514	addr.sin_family = AF_INET;
515	addr.sin_addr.s_addr = bind_addr;
516	addr.sin_port = port;
517
518	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
519	{
520	LogRel(("NAT: bind to %RTnaipv4 has been failed\n", addr.sin_addr));
521	udp_detach(pData, so);
522	return NULL;
523	}
524	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
525	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
526
527	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
528	so->so_fport = addr.sin_port;
529	/* The original check was completely broken, as the commented out
530	* if statement was always true (INADDR_ANY=0). */
531	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
532	if (1 == 0) /* always use the else part */
533	so->so_faddr = alias_addr;
534	else
535	so->so_faddr = addr.sin_addr;
536
537	so->so_lport = lport;
538	so->so_laddr.s_addr = laddr;
539	if (flags != SS_FACCEPTONCE)
540	so->so_expire = 0;
541
542	so->so_state = SS_ISFCONNECTED;
543
544	return so;
545	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 37808

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