udp.c@ 28587

Last change on this file since 28587 was 28522, checked in by vboxsync, 15 years ago
NAT: logs l3->l2.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 15.9 KB

Line
1	/* $Id: udp.c 28522 2010-04-20 13:42:15Z vboxsync $ */
2	/** @file
3	* NAT - UDP protocol.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	/*
23	* This code is based on:
24	*
25	* Copyright (c) 1982, 1986, 1988, 1990, 1993
26	* The Regents of the University of California. All rights reserved.
27	*
28	* Redistribution and use in source and binary forms, with or without
29	* modification, are permitted provided that the following conditions
30	* are met:
31	* 1. Redistributions of source code must retain the above copyright
32	* notice, this list of conditions and the following disclaimer.
33	* 2. Redistributions in binary form must reproduce the above copyright
34	* notice, this list of conditions and the following disclaimer in the
35	* documentation and/or other materials provided with the distribution.
36	* 3. All advertising materials mentioning features or use of this software
37	* must display the following acknowledgement:
38	* This product includes software developed by the University of
39	* California, Berkeley and its contributors.
40	* 4. Neither the name of the University nor the names of its contributors
41	* may be used to endorse or promote products derived from this software
42	* without specific prior written permission.
43	*
44	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
45	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
48	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54	* SUCH DAMAGE.
55	*
56	* @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94
57	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
58	*/
59
60	/*
61	* Changes and additions relating to SLiRP
62	* Copyright (c) 1995 Danny Gasparovski.
63	*
64	* Please read the file COPYRIGHT for the
65	* terms and conditions of the copyright.
66	*/
67
68	#include <slirp.h>
69	#include "ip_icmp.h"
70	#include "ctl.h"
71
72
73	/*
74	* UDP protocol implementation.
75	* Per RFC 768, August, 1980.
76	*/
77	#define udpcksum 1
78
79	void
80	udp_init(PNATState pData)
81	{
82	udp_last_so = &udb;
83	udb.so_next = udb.so_prev = &udb;
84	}
85
86	/* m->m_data points at ip packet header
87	* m->m_len length ip packet
88	* ip->ip_len length data (IPDU)
89	*/
90	void
91	udp_input(PNATState pData, register struct mbuf *m, int iphlen)
92	{
93	register struct ip *ip;
94	register struct udphdr *uh;
95	int len;
96	struct ip save_ip;
97	struct socket *so;
98	int ret;
99	int ttl;
100
101	DEBUG_CALL("udp_input");
102	DEBUG_ARG("m = %lx", (long)m);
103	ip = mtod(m, struct ip *);
104	DEBUG_ARG("iphlen = %d", iphlen);
105	Log2(("%R[IP4] iphlen = %d\n", &ip->ip_dst, iphlen));
106
107	udpstat.udps_ipackets++;
108
109	/*
110	* Strip IP options, if any; should skip this,
111	* make available to user, and use on returned packets,
112	* but we don't yet have a way to check the checksum
113	* with options still present.
114	*/
115	if (iphlen > sizeof(struct ip))
116	{
117	ip_stripoptions(m, (struct mbuf *)0);
118	iphlen = sizeof(struct ip);
119	}
120
121	/*
122	* Get IP and UDP header together in first mbuf.
123	*/
124	ip = mtod(m, struct ip *);
125	uh = (struct udphdr *)((caddr_t)ip + iphlen);
126
127	/*
128	* Make mbuf data length reflect UDP length.
129	* If not enough data to reflect UDP length, drop.
130	*/
131	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
132	Assert((ip->ip_len == len));
133	#ifndef VBOX_WITH_SLIRP_BSD_MBUF
134	Assert((ip->ip_len + iphlen == m->m_len));
135	#else
136	Assert((ip->ip_len + iphlen == m_length(m, NULL)));
137	#endif
138
139	if (ip->ip_len != len)
140	{
141	if (len > ip->ip_len)
142	{
143	udpstat.udps_badlen++;
144	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
145	}
146	m_adj(m, len - ip->ip_len);
147	ip->ip_len = len;
148	}
149
150	/*
151	* Save a copy of the IP header in case we want restore it
152	* for sending an ICMP error message in response.
153	*/
154	save_ip = *ip;
155	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
156
157	/*
158	* Checksum extended UDP header and data.
159	*/
160	if (udpcksum && uh->uh_sum)
161	{
162	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
163	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
164	#if 0
165	/* keep uh_sum for ICMP reply */
166	uh->uh_sum = cksum(m, len + sizeof (struct ip));
167	if (uh->uh_sum)
168	{
169
170	#endif
171	if(cksum(m, len + iphlen))
172	{
173	udpstat.udps_badsum++;
174	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
175	goto bad;
176	}
177	}
178	#if 0
179	}
180	#endif
181
182	/*
183	* handle DHCP/BOOTP
184	*/
185	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
186	{
187	bootp_input(pData, m);
188	goto done;
189	}
190
191	if ( pData->fUseHostResolver
192	&& uh->uh_dport == RT_H2N_U16_C(53)
193	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_DNS))
194	{
195	struct sockaddr_in dst, src;
196	src.sin_addr.s_addr = ip->ip_dst.s_addr;
197	src.sin_port = uh->uh_dport;
198	dst.sin_addr.s_addr = ip->ip_src.s_addr;
199	dst.sin_port = uh->uh_sport;
200	/* udp_output2 will do opposite operations on mbuf*/
201
202	m->m_data += sizeof(struct udpiphdr);
203	m->m_len -= sizeof(struct udpiphdr);
204	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
205	goto done;
206	}
207	/*
208	* handle TFTP
209	*/
210	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
211	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_TFTP))
212	{
213	tftp_input(pData, m);
214	goto done;
215	}
216
217	/*
218	* Locate pcb for datagram.
219	*/
220	so = udp_last_so;
221	if ( so->so_lport != uh->uh_sport
222	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
223	{
224	struct socket *tmp;
225
226	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
227	{
228	if ( tmp->so_lport == uh->uh_sport
229	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
230	{
231	so = tmp;
232	break;
233	}
234	}
235	if (tmp == &udb)
236	so = NULL;
237	else
238	{
239	udpstat.udpps_pcbcachemiss++;
240	udp_last_so = so;
241	}
242	}
243
244	if (so == NULL)
245	{
246	/*
247	* If there's no socket for this packet,
248	* create one
249	*/
250	if ((so = socreate()) == NULL)
251	{
252	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
253	goto bad;
254	}
255	if (udp_attach(pData, so, 0) == -1)
256	{
257	Log2(("NAT: IP(id: %hd) udp_attach errno = %d-%s\n",
258	ip->ip_id, errno, strerror(errno)));
259	sofree(pData, so);
260	goto bad;
261	}
262
263	/*
264	* Setup fields
265	*/
266	/* udp_last_so = so; */
267	so->so_laddr = ip->ip_src;
268	so->so_lport = uh->uh_sport;
269
270	so->so_iptos = ip->ip_tos;
271
272	/*
273	* XXXXX Here, check if it's in udpexec_list,
274	* and if it is, do the fork_exec() etc.
275	*/
276	}
277
278	so->so_faddr = ip->ip_dst; /* XXX */
279	so->so_fport = uh->uh_dport; /* XXX */
280
281	/*
282	* DNS proxy
283	*/
284	if ( pData->fUseDnsProxy
285	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
286	&& (uh->uh_dport == RT_H2N_U16_C(53)))
287	{
288	dnsproxy_query(pData, so, m, iphlen);
289	goto done;
290	}
291
292	iphlen += sizeof(struct udphdr);
293	m->m_len -= iphlen;
294	m->m_data += iphlen;
295
296	ttl = ip->ip_ttl = save_ip.ip_ttl;
297	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
298	if (ret < 0)
299	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
300	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
301
302	if (sosendto(pData, so, m) == -1)
303	{
304	m->m_len += iphlen;
305	m->m_data -= iphlen;
306	*ip = save_ip;
307	DEBUG_MISC((dfd,"NAT: UDP tx errno = %d-%s (on sent to %R[IP4])\n", errno,
308	strerror(errno), &ip->ip_dst));
309	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
310	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
311	so->so_m = NULL;
312	}
313
314	if (so->so_m)
315	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
316
317	/* restore the orig mbuf packet */
318	m->m_len += iphlen;
319	m->m_data -= iphlen;
320	*ip = save_ip;
321	so->so_m = m; /* ICMP backup */
322
323	return;
324
325	bad:
326	Log2(("NAT: UDP(id: %hd) datagram to %R[IP4] with size(%d) claimed as bad\n",
327	ip->ip_id, &ip->ip_dst, ip->ip_len));
328	done:
329	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
330	* and create new m'buffers to send them to guest, so we'll free their incomming
331	* buffers here.
332	*/
333	m_freem(pData, m);
334	return;
335	}
336
337	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
338	struct sockaddr_in saddr, struct sockaddr_in daddr,
339	int iptos)
340	{
341	register struct udpiphdr *ui;
342	int error = 0;
343
344	DEBUG_CALL("udp_output");
345	DEBUG_ARG("so = %lx", (long)so);
346	DEBUG_ARG("m = %lx", (long)m);
347	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
348	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
349
350	/*
351	* Adjust for header
352	*/
353	m->m_data -= sizeof(struct udpiphdr);
354	m->m_len += sizeof(struct udpiphdr);
355
356	/*
357	* Fill in mbuf with extended UDP header
358	* and addresses and length put into network format.
359	*/
360	ui = mtod(m, struct udpiphdr *);
361	memset(ui->ui_x1, 0, 9);
362	ui->ui_pr = IPPROTO_UDP;
363	ui->ui_len = RT_H2N_U16(m->m_len - sizeof(struct ip));
364	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
365	ui->ui_src = saddr->sin_addr;
366	ui->ui_dst = daddr->sin_addr;
367	ui->ui_sport = saddr->sin_port;
368	ui->ui_dport = daddr->sin_port;
369	ui->ui_ulen = ui->ui_len;
370
371	/*
372	* Stuff checksum and output datagram.
373	*/
374	ui->ui_sum = 0;
375	if (udpcksum)
376	{
377	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
378	ui->ui_sum = 0xffff;
379	}
380	((struct ip *)ui)->ip_len = m->m_len;
381	((struct ip *)ui)->ip_ttl = ip_defttl;
382	((struct ip *)ui)->ip_tos = iptos;
383
384	udpstat.udps_opackets++;
385
386	error = ip_output(pData, so, m);
387
388	return error;
389	}
390
391	int udp_output(PNATState pData, struct socket so, struct mbuf m,
392	struct sockaddr_in *addr)
393	{
394	struct sockaddr_in saddr, daddr;
395
396	saddr = *addr;
397	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
398	{
399	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
400	if ((so->so_faddr.s_addr & RT_H2N_U32(~pData->netmask)) == RT_H2N_U32(~pData->netmask))
401	saddr.sin_addr.s_addr = alias_addr.s_addr;
402	}
403
404	/* Any UDP packet to the loopback address must be translated to be from
405	* the forwarding address, i.e. 10.0.2.2. */
406	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
407	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
408	saddr.sin_addr.s_addr = alias_addr.s_addr;
409
410	daddr.sin_addr = so->so_laddr;
411	daddr.sin_port = so->so_lport;
412
413	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
414	}
415
416	int
417	udp_attach(PNATState pData, struct socket *so, int service_port)
418	{
419	struct sockaddr_in *addr;
420	struct sockaddr sa_addr;
421	socklen_t socklen = sizeof(struct sockaddr);
422	int status;
423	int opt = 1;
424
425	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
426	goto error;
427	/*
428	* Here, we bind() the socket. Although not really needed
429	* (sendto() on an unbound socket will bind it), it's done
430	* here so that emulation of ytalk etc. don't have to do it
431	*/
432	memset(&sa_addr, 0, sizeof(struct sockaddr));
433	addr = (struct sockaddr_in *)&sa_addr;
434	#ifdef RT_OS_DARWIN
435	addr->sin_len = sizeof(struct sockaddr_in);
436	#endif
437	addr->sin_family = AF_INET;
438	addr->sin_port = service_port;
439	addr->sin_addr.s_addr = pData->bindIP.s_addr;
440	fd_nonblock(so->s);
441	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
442	{
443	int lasterrno = errno;
444	closesocket(so->s);
445	so->s = -1;
446	#ifdef RT_OS_WINDOWS
447	WSASetLastError(lasterrno);
448	#else
449	errno = lasterrno;
450	#endif
451	goto error;
452	}
453	/* success, insert in queue */
454	so->so_expire = curtime + SO_EXPIRE;
455	/* enable broadcast for later use */
456	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
457	status = getsockname(so->s, &sa_addr, &socklen);
458	Assert(status == 0 && sa_addr.sa_family == AF_INET);
459	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
460	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
461	SOCKET_LOCK_CREATE(so);
462	QSOCKET_LOCK(udb);
463	insque(pData, so, &udb);
464	NSOCK_INC();
465	QSOCKET_UNLOCK(udb);
466	return so->s;
467	error:
468	Log2(("NAT: can't create datagramm socket\n"));
469	return -1;
470	}
471
472	void
473	udp_detach(PNATState pData, struct socket *so)
474	{
475	if (so != &pData->icmp_socket)
476	{
477	QSOCKET_LOCK(udb);
478	SOCKET_LOCK(so);
479	QSOCKET_UNLOCK(udb);
480	closesocket(so->s);
481	sofree(pData, so);
482	SOCKET_UNLOCK(so);
483	}
484	}
485
486	struct socket *
487	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
488	{
489	struct sockaddr_in addr;
490	struct socket *so;
491	socklen_t addrlen = sizeof(struct sockaddr_in);
492	int opt = 1;
493
494	if ((so = socreate()) == NULL)
495	return NULL;
496
497	so->s = socket(AF_INET, SOCK_DGRAM, 0);
498	if (so->s == -1)
499	{
500	LogRel(("NAT: can't create datagram socket\n"));
501	RTMemFree(so);
502	return NULL;
503	}
504	so->so_expire = curtime + SO_EXPIRE;
505	fd_nonblock(so->s);
506	SOCKET_LOCK_CREATE(so);
507	QSOCKET_LOCK(udb);
508	insque(pData, so, &udb);
509	NSOCK_INC();
510	QSOCKET_UNLOCK(udb);
511
512	memset(&addr, 0, sizeof(addr));
513	#ifdef RT_OS_DARWIN
514	addr.sin_len = sizeof(addr);
515	#endif
516	addr.sin_family = AF_INET;
517	addr.sin_addr.s_addr = bind_addr;
518	addr.sin_port = port;
519
520	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
521	{
522	LogRel(("NAT: bind to %R[IP4] has been failed\n", &addr.sin_addr));
523	udp_detach(pData, so);
524	return NULL;
525	}
526	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
527	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
528
529	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
530	so->so_fport = addr.sin_port;
531	/* The original check was completely broken, as the commented out
532	* if statement was always true (INADDR_ANY=0). */
533	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
534	if (1 == 0) /* always use the else part */
535	so->so_faddr = alias_addr;
536	else
537	so->so_faddr = addr.sin_addr;
538
539	so->so_lport = lport;
540	so->so_laddr.s_addr = laddr;
541	if (flags != SS_FACCEPTONCE)
542	so->so_expire = 0;
543
544	so->so_state = SS_ISFCONNECTED;
545
546	return so;
547	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 28587

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