udp.c@ 28915

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1	/* $Id: udp.c 28800 2010-04-27 08:22:32Z 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	DEBUG_CALL("udp_input");
98	DEBUG_ARG("m = %lx", (long)m);
99	ip = mtod(m, struct ip *);
100	DEBUG_ARG("iphlen = %d", iphlen);
101	Log2(("%R[IP4] iphlen = %d\n", &ip->ip_dst, iphlen));
102
103	udpstat.udps_ipackets++;
104
105	/*
106	* Strip IP options, if any; should skip this,
107	* make available to user, and use on returned packets,
108	* but we don't yet have a way to check the checksum
109	* with options still present.
110	*/
111	if (iphlen > sizeof(struct ip))
112	{
113	ip_stripoptions(m, (struct mbuf *)0);
114	iphlen = sizeof(struct ip);
115	}
116
117	/*
118	* Get IP and UDP header together in first mbuf.
119	*/
120	ip = mtod(m, struct ip *);
121	uh = (struct udphdr *)((caddr_t)ip + iphlen);
122
123	/*
124	* Make mbuf data length reflect UDP length.
125	* If not enough data to reflect UDP length, drop.
126	*/
127	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
128	Assert((ip->ip_len == len));
129	#ifndef VBOX_WITH_SLIRP_BSD_MBUF
130	Assert((ip->ip_len + iphlen == m->m_len));
131	#else
132	Assert((ip->ip_len + iphlen == m_length(m, NULL)));
133	#endif
134
135	if (ip->ip_len != len)
136	{
137	if (len > ip->ip_len)
138	{
139	udpstat.udps_badlen++;
140	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
141	}
142	m_adj(m, len - ip->ip_len);
143	ip->ip_len = len;
144	}
145
146	/*
147	* Save a copy of the IP header in case we want restore it
148	* for sending an ICMP error message in response.
149	*/
150	save_ip = *ip;
151	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
152
153	/*
154	* Checksum extended UDP header and data.
155	*/
156	if (udpcksum && uh->uh_sum)
157	{
158	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
159	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
160	#if 0
161	/* keep uh_sum for ICMP reply */
162	uh->uh_sum = cksum(m, len + sizeof (struct ip));
163	if (uh->uh_sum)
164	{
165
166	#endif
167	if(cksum(m, len + iphlen))
168	{
169	udpstat.udps_badsum++;
170	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
171	goto bad;
172	}
173	}
174	#if 0
175	}
176	#endif
177
178	/*
179	* handle DHCP/BOOTP
180	*/
181	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
182	{
183	bootp_input(pData, m);
184	goto done;
185	}
186
187	if ( pData->fUseHostResolver
188	&& uh->uh_dport == RT_H2N_U16_C(53)
189	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_DNS))
190	{
191	struct sockaddr_in dst, src;
192	src.sin_addr.s_addr = ip->ip_dst.s_addr;
193	src.sin_port = uh->uh_dport;
194	dst.sin_addr.s_addr = ip->ip_src.s_addr;
195	dst.sin_port = uh->uh_sport;
196	/* udp_output2 will do opposite operations on mbuf*/
197
198	m->m_data += sizeof(struct udpiphdr);
199	m->m_len -= sizeof(struct udpiphdr);
200	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
201	goto done;
202	}
203	/*
204	* handle TFTP
205	*/
206	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
207	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_TFTP))
208	{
209	tftp_input(pData, m);
210	goto done;
211	}
212
213	/*
214	* Locate pcb for datagram.
215	*/
216	so = udp_last_so;
217	if ( so->so_lport != uh->uh_sport
218	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
219	{
220	struct socket *tmp;
221
222	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
223	{
224	if ( tmp->so_lport == uh->uh_sport
225	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
226	{
227	so = tmp;
228	break;
229	}
230	}
231	if (tmp == &udb)
232	so = NULL;
233	else
234	{
235	udpstat.udpps_pcbcachemiss++;
236	udp_last_so = so;
237	}
238	}
239
240	if (so == NULL)
241	{
242	/*
243	* If there's no socket for this packet,
244	* create one
245	*/
246	if ((so = socreate()) == NULL)
247	{
248	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
249	goto bad;
250	}
251	if (udp_attach(pData, so, 0) == -1)
252	{
253	Log2(("NAT: IP(id: %hd) udp_attach errno = %d-%s\n",
254	ip->ip_id, errno, strerror(errno)));
255	sofree(pData, so);
256	goto bad;
257	}
258
259	/*
260	* Setup fields
261	*/
262	/* udp_last_so = so; */
263	so->so_laddr = ip->ip_src;
264	so->so_lport = uh->uh_sport;
265
266	so->so_iptos = ip->ip_tos;
267
268	/*
269	* XXXXX Here, check if it's in udpexec_list,
270	* and if it is, do the fork_exec() etc.
271	*/
272	}
273
274	so->so_faddr = ip->ip_dst; /* XXX */
275	so->so_fport = uh->uh_dport; /* XXX */
276
277	/*
278	* DNS proxy
279	*/
280	if ( pData->fUseDnsProxy
281	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
282	&& (uh->uh_dport == RT_H2N_U16_C(53)))
283	{
284	dnsproxy_query(pData, so, m, iphlen);
285	goto done;
286	}
287
288	iphlen += sizeof(struct udphdr);
289	m->m_len -= iphlen;
290	m->m_data += iphlen;
291
292	ttl = ip->ip_ttl = save_ip.ip_ttl;
293	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
294	if (ret < 0)
295	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
296	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
297
298	if (sosendto(pData, so, m) == -1)
299	{
300	m->m_len += iphlen;
301	m->m_data -= iphlen;
302	*ip = save_ip;
303	DEBUG_MISC((dfd,"NAT: UDP tx errno = %d-%s (on sent to %R[IP4])\n", errno,
304	strerror(errno), &ip->ip_dst));
305	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
306	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
307	so->so_m = NULL;
308	}
309
310	if (so->so_m)
311	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
312
313	/* restore the orig mbuf packet */
314	m->m_len += iphlen;
315	m->m_data -= iphlen;
316	*ip = save_ip;
317	so->so_m = m; /* ICMP backup */
318
319	return;
320
321	bad:
322	Log2(("NAT: UDP(id: %hd) datagram to %R[IP4] with size(%d) claimed as bad\n",
323	ip->ip_id, &ip->ip_dst, ip->ip_len));
324	done:
325	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
326	* and create new m'buffers to send them to guest, so we'll free their incomming
327	* buffers here.
328	*/
329	m_freem(pData, m);
330	return;
331	}
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 = 0;
339
340	DEBUG_CALL("udp_output");
341	DEBUG_ARG("so = %lx", (long)so);
342	DEBUG_ARG("m = %lx", (long)m);
343	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
344	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
345
346	/*
347	* Adjust for header
348	*/
349	m->m_data -= sizeof(struct udpiphdr);
350	m->m_len += sizeof(struct udpiphdr);
351
352	/*
353	* Fill in mbuf with extended UDP header
354	* and addresses and length put into network format.
355	*/
356	ui = mtod(m, struct udpiphdr *);
357	memset(ui->ui_x1, 0, 9);
358	ui->ui_pr = IPPROTO_UDP;
359	ui->ui_len = RT_H2N_U16(m->m_len - sizeof(struct ip));
360	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
361	ui->ui_src = saddr->sin_addr;
362	ui->ui_dst = daddr->sin_addr;
363	ui->ui_sport = saddr->sin_port;
364	ui->ui_dport = daddr->sin_port;
365	ui->ui_ulen = ui->ui_len;
366
367	/*
368	* Stuff checksum and output datagram.
369	*/
370	ui->ui_sum = 0;
371	if (udpcksum)
372	{
373	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
374	ui->ui_sum = 0xffff;
375	}
376	((struct ip *)ui)->ip_len = m->m_len;
377	((struct ip *)ui)->ip_ttl = ip_defttl;
378	((struct ip *)ui)->ip_tos = iptos;
379
380	udpstat.udps_opackets++;
381
382	error = ip_output(pData, so, m);
383
384	return error;
385	}
386
387	int udp_output(PNATState pData, struct socket so, struct mbuf m,
388	struct sockaddr_in *addr)
389	{
390	struct sockaddr_in saddr, daddr;
391
392	saddr = *addr;
393	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
394	{
395	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
396	if ((so->so_faddr.s_addr & RT_H2N_U32(~pData->netmask)) == RT_H2N_U32(~pData->netmask))
397	saddr.sin_addr.s_addr = alias_addr.s_addr;
398	}
399
400	/* Any UDP packet to the loopback address must be translated to be from
401	* the forwarding address, i.e. 10.0.2.2. */
402	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
403	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
404	saddr.sin_addr.s_addr = alias_addr.s_addr;
405
406	daddr.sin_addr = so->so_laddr;
407	daddr.sin_port = so->so_lport;
408
409	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
410	}
411
412	int
413	udp_attach(PNATState pData, struct socket *so, int service_port)
414	{
415	struct sockaddr_in *addr;
416	struct sockaddr sa_addr;
417	socklen_t socklen = sizeof(struct sockaddr);
418	int status;
419	int opt = 1;
420
421	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
422	goto error;
423	/*
424	* Here, we bind() the socket. Although not really needed
425	* (sendto() on an unbound socket will bind it), it's done
426	* here so that emulation of ytalk etc. don't have to do it
427	*/
428	memset(&sa_addr, 0, sizeof(struct sockaddr));
429	addr = (struct sockaddr_in *)&sa_addr;
430	#ifdef RT_OS_DARWIN
431	addr->sin_len = sizeof(struct sockaddr_in);
432	#endif
433	addr->sin_family = AF_INET;
434	addr->sin_port = service_port;
435	addr->sin_addr.s_addr = pData->bindIP.s_addr;
436	fd_nonblock(so->s);
437	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
438	{
439	int lasterrno = errno;
440	closesocket(so->s);
441	so->s = -1;
442	#ifdef RT_OS_WINDOWS
443	WSASetLastError(lasterrno);
444	#else
445	errno = lasterrno;
446	#endif
447	goto error;
448	}
449	/* success, insert in queue */
450	so->so_expire = curtime + SO_EXPIRE;
451	/* enable broadcast for later use */
452	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
453	status = getsockname(so->s, &sa_addr, &socklen);
454	Assert(status == 0 && sa_addr.sa_family == AF_INET);
455	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
456	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
457	SOCKET_LOCK_CREATE(so);
458	QSOCKET_LOCK(udb);
459	insque(pData, so, &udb);
460	NSOCK_INC();
461	QSOCKET_UNLOCK(udb);
462	return so->s;
463	error:
464	Log2(("NAT: can't create datagramm socket\n"));
465	return -1;
466	}
467
468	void
469	udp_detach(PNATState pData, struct socket *so)
470	{
471	if (so != &pData->icmp_socket)
472	{
473	QSOCKET_LOCK(udb);
474	SOCKET_LOCK(so);
475	QSOCKET_UNLOCK(udb);
476	closesocket(so->s);
477	sofree(pData, so);
478	SOCKET_UNLOCK(so);
479	}
480	}
481
482	struct socket *
483	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
484	{
485	struct sockaddr_in addr;
486	struct socket *so;
487	socklen_t addrlen = sizeof(struct sockaddr_in);
488	int opt = 1;
489
490	if ((so = socreate()) == NULL)
491	return NULL;
492
493	so->s = socket(AF_INET, SOCK_DGRAM, 0);
494	if (so->s == -1)
495	{
496	LogRel(("NAT: can't create datagram socket\n"));
497	RTMemFree(so);
498	return NULL;
499	}
500	so->so_expire = curtime + SO_EXPIRE;
501	fd_nonblock(so->s);
502	SOCKET_LOCK_CREATE(so);
503	QSOCKET_LOCK(udb);
504	insque(pData, so, &udb);
505	NSOCK_INC();
506	QSOCKET_UNLOCK(udb);
507
508	memset(&addr, 0, sizeof(addr));
509	#ifdef RT_OS_DARWIN
510	addr.sin_len = sizeof(addr);
511	#endif
512	addr.sin_family = AF_INET;
513	addr.sin_addr.s_addr = bind_addr;
514	addr.sin_port = port;
515
516	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
517	{
518	LogRel(("NAT: bind to %R[IP4] has been failed\n", &addr.sin_addr));
519	udp_detach(pData, so);
520	return NULL;
521	}
522	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
523	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
524
525	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
526	so->so_fport = addr.sin_port;
527	/* The original check was completely broken, as the commented out
528	* if statement was always true (INADDR_ANY=0). */
529	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
530	if (1 == 0) /* always use the else part */
531	so->so_faddr = alias_addr;
532	else
533	so->so_faddr = addr.sin_addr;
534
535	so->so_lport = lport;
536	so->so_laddr.s_addr = laddr;
537	if (flags != SS_FACCEPTONCE)
538	so->so_expire = 0;
539
540	so->so_state = SS_ISFCONNECTED;
541
542	return so;
543	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 28915

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