udp.c@ 30351

Last change on this file since 30351 was 30350, checked in by vboxsync, 15 years ago
NAT: Don't m_free mbuf just after send, it's responsible of recv threads to release mbuf.
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 30350 2010-06-22 02:39:23Z 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	Assert((ip->ip_len + iphlen == m_length(m, NULL)));
130
131	if (ip->ip_len != len)
132	{
133	if (len > ip->ip_len)
134	{
135	udpstat.udps_badlen++;
136	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
137	}
138	m_adj(m, len - ip->ip_len);
139	ip->ip_len = len;
140	}
141
142	/*
143	* Save a copy of the IP header in case we want restore it
144	* for sending an ICMP error message in response.
145	*/
146	save_ip = *ip;
147	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
148
149	/*
150	* Checksum extended UDP header and data.
151	*/
152	if (udpcksum && uh->uh_sum)
153	{
154	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
155	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
156	#if 0
157	/* keep uh_sum for ICMP reply */
158	uh->uh_sum = cksum(m, len + sizeof (struct ip));
159	if (uh->uh_sum)
160	{
161
162	#endif
163	if(cksum(m, len + iphlen))
164	{
165	udpstat.udps_badsum++;
166	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
167	goto bad;
168	}
169	}
170	#if 0
171	}
172	#endif
173
174	/*
175	* handle DHCP/BOOTP
176	*/
177	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
178	{
179	bootp_input(pData, m);
180	goto done;
181	}
182
183	if ( pData->fUseHostResolver
184	&& uh->uh_dport == RT_H2N_U16_C(53)
185	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_DNS))
186	{
187	struct sockaddr_in dst, src;
188	src.sin_addr.s_addr = ip->ip_dst.s_addr;
189	src.sin_port = uh->uh_dport;
190	dst.sin_addr.s_addr = ip->ip_src.s_addr;
191	dst.sin_port = uh->uh_sport;
192
193	/* udp_output2 expects pointer on the body of UDP packet. */
194
195	m->m_data += sizeof(struct udpiphdr);
196	m->m_len -= sizeof(struct udpiphdr);
197	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
198	/* we shouldn't free this mbuf*/
199	return;
200	}
201	/*
202	* handle TFTP
203	*/
204	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
205	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_TFTP))
206	{
207	tftp_input(pData, m);
208	goto done;
209	}
210
211	/*
212	* Locate pcb for datagram.
213	*/
214	so = udp_last_so;
215	if ( so->so_lport != uh->uh_sport
216	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
217	{
218	struct socket *tmp;
219
220	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
221	{
222	if ( tmp->so_lport == uh->uh_sport
223	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
224	{
225	so = tmp;
226	break;
227	}
228	}
229	if (tmp == &udb)
230	so = NULL;
231	else
232	{
233	udpstat.udpps_pcbcachemiss++;
234	udp_last_so = so;
235	}
236	}
237
238	if (so == NULL)
239	{
240	/*
241	* If there's no socket for this packet,
242	* create one
243	*/
244	if ((so = socreate()) == NULL)
245	{
246	Log2(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
247	goto bad;
248	}
249	if (udp_attach(pData, so, 0) == -1)
250	{
251	Log2(("NAT: IP(id: %hd) udp_attach errno = %d-%s\n",
252	ip->ip_id, errno, strerror(errno)));
253	sofree(pData, so);
254	goto bad;
255	}
256
257	/*
258	* Setup fields
259	*/
260	/* udp_last_so = so; */
261	so->so_laddr = ip->ip_src;
262	so->so_lport = uh->uh_sport;
263
264	so->so_iptos = ip->ip_tos;
265
266	/*
267	* XXXXX Here, check if it's in udpexec_list,
268	* and if it is, do the fork_exec() etc.
269	*/
270	}
271
272	so->so_faddr = ip->ip_dst; /* XXX */
273	so->so_fport = uh->uh_dport; /* XXX */
274
275	/*
276	* DNS proxy
277	*/
278	if ( pData->fUseDnsProxy
279	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
280	&& (uh->uh_dport == RT_H2N_U16_C(53)))
281	{
282	dnsproxy_query(pData, so, m, iphlen);
283	goto done;
284	}
285
286	iphlen += sizeof(struct udphdr);
287	m->m_len -= iphlen;
288	m->m_data += iphlen;
289
290	ttl = ip->ip_ttl = save_ip.ip_ttl;
291	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
292	if (ret < 0)
293	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
294	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
295
296	if (sosendto(pData, so, m) == -1)
297	{
298	m->m_len += iphlen;
299	m->m_data -= iphlen;
300	*ip = save_ip;
301	DEBUG_MISC((dfd,"NAT: UDP tx errno = %d-%s (on sent to %R[IP4])\n", errno,
302	strerror(errno), &ip->ip_dst));
303	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
304	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
305	so->so_m = NULL;
306	}
307
308	if (so->so_m)
309	m_freem(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
310
311	/* restore the orig mbuf packet */
312	m->m_len += iphlen;
313	m->m_data -= iphlen;
314	*ip = save_ip;
315	so->so_m = m; /* ICMP backup */
316
317	return;
318
319	bad:
320	Log2(("NAT: UDP(id: %hd) datagram to %R[IP4] with size(%d) claimed as bad\n",
321	ip->ip_id, &ip->ip_dst, ip->ip_len));
322	done:
323	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
324	* and create new m'buffers to send them to guest, so we'll free their incomming
325	* buffers here.
326	*/
327	m_freem(pData, m);
328	return;
329	}
330
331	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
332	struct sockaddr_in saddr, struct sockaddr_in daddr,
333	int iptos)
334	{
335	register struct udpiphdr *ui;
336	int error = 0;
337
338	DEBUG_CALL("udp_output");
339	DEBUG_ARG("so = %lx", (long)so);
340	DEBUG_ARG("m = %lx", (long)m);
341	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
342	DEBUG_ARG("daddr = %lx", (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
350	/*
351	* Fill in mbuf with extended UDP header
352	* and addresses and length put into network format.
353	*/
354	ui = mtod(m, struct udpiphdr *);
355	memset(ui->ui_x1, 0, 9);
356	ui->ui_pr = IPPROTO_UDP;
357	ui->ui_len = RT_H2N_U16(m->m_len - sizeof(struct ip));
358	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
359	ui->ui_src = saddr->sin_addr;
360	ui->ui_dst = daddr->sin_addr;
361	ui->ui_sport = saddr->sin_port;
362	ui->ui_dport = daddr->sin_port;
363	ui->ui_ulen = ui->ui_len;
364
365	/*
366	* Stuff checksum and output datagram.
367	*/
368	ui->ui_sum = 0;
369	if (udpcksum)
370	{
371	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
372	ui->ui_sum = 0xffff;
373	}
374	((struct ip *)ui)->ip_len = m->m_len;
375	((struct ip *)ui)->ip_ttl = ip_defttl;
376	((struct ip *)ui)->ip_tos = iptos;
377
378	udpstat.udps_opackets++;
379
380	error = ip_output(pData, so, m);
381
382	return error;
383	}
384
385	int udp_output(PNATState pData, struct socket so, struct mbuf m,
386	struct sockaddr_in *addr)
387	{
388	struct sockaddr_in saddr, daddr;
389
390	saddr = *addr;
391	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
392	{
393	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
394	if ((so->so_faddr.s_addr & RT_H2N_U32(~pData->netmask)) == RT_H2N_U32(~pData->netmask))
395	saddr.sin_addr.s_addr = alias_addr.s_addr;
396	}
397
398	/* Any UDP packet to the loopback address must be translated to be from
399	* the forwarding address, i.e. 10.0.2.2. */
400	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
401	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
402	saddr.sin_addr.s_addr = alias_addr.s_addr;
403
404	daddr.sin_addr = so->so_laddr;
405	daddr.sin_port = so->so_lport;
406
407	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
408	}
409
410	int
411	udp_attach(PNATState pData, struct socket *so, int service_port)
412	{
413	struct sockaddr_in *addr;
414	struct sockaddr sa_addr;
415	socklen_t socklen = sizeof(struct sockaddr);
416	int status;
417	int opt = 1;
418
419	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
420	goto error;
421	/*
422	* Here, we bind() the socket. Although not really needed
423	* (sendto() on an unbound socket will bind it), it's done
424	* here so that emulation of ytalk etc. don't have to do it
425	*/
426	memset(&sa_addr, 0, sizeof(struct sockaddr));
427	addr = (struct sockaddr_in *)&sa_addr;
428	#ifdef RT_OS_DARWIN
429	addr->sin_len = sizeof(struct sockaddr_in);
430	#endif
431	addr->sin_family = AF_INET;
432	addr->sin_port = service_port;
433	addr->sin_addr.s_addr = pData->bindIP.s_addr;
434	fd_nonblock(so->s);
435	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
436	{
437	int lasterrno = errno;
438	closesocket(so->s);
439	so->s = -1;
440	#ifdef RT_OS_WINDOWS
441	WSASetLastError(lasterrno);
442	#else
443	errno = lasterrno;
444	#endif
445	goto error;
446	}
447	/* success, insert in queue */
448	so->so_expire = curtime + SO_EXPIRE;
449	/* enable broadcast for later use */
450	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
451	status = getsockname(so->s, &sa_addr, &socklen);
452	Assert(status == 0 && sa_addr.sa_family == AF_INET);
453	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
454	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
455	SOCKET_LOCK_CREATE(so);
456	QSOCKET_LOCK(udb);
457	insque(pData, so, &udb);
458	NSOCK_INC();
459	QSOCKET_UNLOCK(udb);
460	return so->s;
461	error:
462	Log2(("NAT: can't create datagramm socket\n"));
463	return -1;
464	}
465
466	void
467	udp_detach(PNATState pData, struct socket *so)
468	{
469	if (so != &pData->icmp_socket)
470	{
471	QSOCKET_LOCK(udb);
472	SOCKET_LOCK(so);
473	QSOCKET_UNLOCK(udb);
474	closesocket(so->s);
475	sofree(pData, so);
476	SOCKET_UNLOCK(so);
477	}
478	}
479
480	struct socket *
481	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
482	{
483	struct sockaddr_in addr;
484	struct socket *so;
485	socklen_t addrlen = sizeof(struct sockaddr_in);
486	int opt = 1;
487
488	if ((so = socreate()) == NULL)
489	return NULL;
490
491	so->s = socket(AF_INET, SOCK_DGRAM, 0);
492	if (so->s == -1)
493	{
494	LogRel(("NAT: can't create datagram socket\n"));
495	RTMemFree(so);
496	return NULL;
497	}
498	so->so_expire = curtime + SO_EXPIRE;
499	fd_nonblock(so->s);
500	SOCKET_LOCK_CREATE(so);
501	QSOCKET_LOCK(udb);
502	insque(pData, so, &udb);
503	NSOCK_INC();
504	QSOCKET_UNLOCK(udb);
505
506	memset(&addr, 0, sizeof(addr));
507	#ifdef RT_OS_DARWIN
508	addr.sin_len = sizeof(addr);
509	#endif
510	addr.sin_family = AF_INET;
511	addr.sin_addr.s_addr = bind_addr;
512	addr.sin_port = port;
513
514	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
515	{
516	LogRel(("NAT: bind to %R[IP4] has been failed\n", &addr.sin_addr));
517	udp_detach(pData, so);
518	return NULL;
519	}
520	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
521	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
522
523	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
524	so->so_fport = addr.sin_port;
525	/* The original check was completely broken, as the commented out
526	* if statement was always true (INADDR_ANY=0). */
527	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
528	if (1 == 0) /* always use the else part */
529	so->so_faddr = alias_addr;
530	else
531	so->so_faddr = addr.sin_addr;
532
533	so->so_lport = lport;
534	so->so_laddr.s_addr = laddr;
535	if (flags != SS_FACCEPTONCE)
536	so->so_expire = 0;
537
538	so->so_state = SS_ISFCONNECTED;
539
540	return so;
541	}

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 30351

Download in other formats: