udp.c@ 26594

最後變更在這個檔案從26594是 26404,由 vboxsync 提交於 15 年前
NAT: applied patch from xtracker 3993 (use BSD mbufs)
屬性 svn:eol-style 設為 `native`
檔案大小: 16.0 KB

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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	ip = mtod(m, struct ip *);
81	DEBUG_ARG("iphlen = %d", iphlen);
82	Log2(("%R[IP4] iphlen = %d\n", &ip->ip_dst, iphlen));
83
84	udpstat.udps_ipackets++;
85
86	/*
87	* Strip IP options, if any; should skip this,
88	* make available to user, and use on returned packets,
89	* but we don't yet have a way to check the checksum
90	* with options still present.
91	*/
92	if (iphlen > sizeof(struct ip))
93	{
94	ip_stripoptions(m, (struct mbuf *)0);
95	iphlen = sizeof(struct ip);
96	}
97
98	/*
99	* Get IP and UDP header together in first mbuf.
100	*/
101	ip = mtod(m, struct ip *);
102	uh = (struct udphdr *)((caddr_t)ip + iphlen);
103
104	/*
105	* Make mbuf data length reflect UDP length.
106	* If not enough data to reflect UDP length, drop.
107	*/
108	len = RT_N2H_U16((u_int16_t)uh->uh_ulen);
109	Assert((ip->ip_len == len));
110	Assert((ip->ip_len + iphlen == m->m_len));
111
112	if (ip->ip_len != len)
113	{
114	if (len > ip->ip_len)
115	{
116	udpstat.udps_badlen++;
117	Log3(("NAT: IP(id: %hd) has bad size\n", ip->ip_id));
118	}
119	m_adj(m, len - ip->ip_len);
120	ip->ip_len = len;
121	}
122
123	/*
124	* Save a copy of the IP header in case we want restore it
125	* for sending an ICMP error message in response.
126	*/
127	save_ip = *ip;
128	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
129
130	/*
131	* Checksum extended UDP header and data.
132	*/
133	if (udpcksum && uh->uh_sum)
134	{
135	memset(((struct ipovly *)ip)->ih_x1, 0, 9);
136	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
137	#if 0
138	/* keep uh_sum for ICMP reply */
139	uh->uh_sum = cksum(m, len + sizeof (struct ip));
140	if (uh->uh_sum)
141	{
142
143	#endif
144	if(cksum(m, len + iphlen))
145	{
146	udpstat.udps_badsum++;
147	Log3(("NAT: IP(id: %hd) has bad (udp) cksum\n", ip->ip_id));
148	goto bad;
149	}
150	}
151	#if 0
152	}
153	#endif
154
155	/*
156	* handle DHCP/BOOTP
157	*/
158	if (uh->uh_dport == RT_H2N_U16_C(BOOTP_SERVER))
159	{
160	bootp_input(pData, m);
161	goto done;
162	}
163
164	if ( pData->use_host_resolver
165	&& uh->uh_dport == RT_H2N_U16_C(53)
166	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_DNS))
167	{
168	struct sockaddr_in dst, src;
169	src.sin_addr.s_addr = ip->ip_dst.s_addr;
170	src.sin_port = uh->uh_dport;
171	dst.sin_addr.s_addr = ip->ip_src.s_addr;
172	dst.sin_port = uh->uh_sport;
173	/* udp_output2 will do opposite operations on mbuf*/
174
175	m->m_data += sizeof(struct udpiphdr);
176	m->m_len -= sizeof(struct udpiphdr);
177	udp_output2(pData, NULL, m, &src, &dst, IPTOS_LOWDELAY);
178	goto done;
179	}
180	/*
181	* handle TFTP
182	*/
183	if ( uh->uh_dport == RT_H2N_U16_C(TFTP_SERVER)
184	&& CTL_CHECK(RT_N2H_U32(ip->ip_dst.s_addr), CTL_TFTP))
185	{
186	tftp_input(pData, m);
187	goto done;
188	}
189
190	/*
191	* Locate pcb for datagram.
192	*/
193	so = udp_last_so;
194	if ( so->so_lport != uh->uh_sport
195	\|\| so->so_laddr.s_addr != ip->ip_src.s_addr)
196	{
197	struct socket *tmp;
198
199	for (tmp = udb.so_next; tmp != &udb; tmp = tmp->so_next)
200	{
201	if ( tmp->so_lport == uh->uh_sport
202	&& tmp->so_laddr.s_addr == ip->ip_src.s_addr)
203	{
204	so = tmp;
205	break;
206	}
207	}
208	if (tmp == &udb)
209	so = NULL;
210	else
211	{
212	udpstat.udpps_pcbcachemiss++;
213	udp_last_so = so;
214	}
215	}
216
217	if (so == NULL)
218	{
219	/*
220	* If there's no socket for this packet,
221	* create one
222	*/
223	if ((so = socreate()) == NULL)
224	{
225	Log3(("NAT: IP(id: %hd) failed to create socket\n", ip->ip_id));
226	goto bad;
227	}
228	if (udp_attach(pData, so, 0) == -1)
229	{
230	Log3(("NAT: IP(id: %hd) udp_attach errno = %d-%s\n",
231	ip->ip_id, errno, strerror(errno)));
232	sofree(pData, so);
233	goto bad;
234	}
235
236	/*
237	* Setup fields
238	*/
239	/* udp_last_so = so; */
240	so->so_laddr = ip->ip_src;
241	so->so_lport = uh->uh_sport;
242
243	if ((so->so_iptos = udp_tos(so)) == 0)
244	so->so_iptos = ip->ip_tos;
245
246	/*
247	* XXXXX Here, check if it's in udpexec_list,
248	* and if it is, do the fork_exec() etc.
249	*/
250	}
251
252	so->so_faddr = ip->ip_dst; /* XXX */
253	so->so_fport = uh->uh_dport; /* XXX */
254
255	/*
256	* DNS proxy
257	*/
258	if ( pData->use_dns_proxy
259	&& (ip->ip_dst.s_addr == RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_DNS))
260	&& (uh->uh_dport == RT_H2N_U16_C(53)))
261	{
262	dnsproxy_query(pData, so, m, iphlen);
263	goto done;
264	}
265
266	iphlen += sizeof(struct udphdr);
267	m->m_len -= iphlen;
268	m->m_data += iphlen;
269
270	/*
271	* Now we sendto() the packet.
272	*/
273	if (so->so_emu)
274	udp_emu(pData, so, m);
275
276	ttl = ip->ip_ttl = save_ip.ip_ttl;
277	ret = setsockopt(so->s, IPPROTO_IP, IP_TTL, (const char*)&ttl, sizeof(ttl));
278	if (ret < 0)
279	LogRel(("NAT: Error (%s) occurred while setting TTL(%d) attribute "
280	"of IP packet to socket %R[natsock]\n", strerror(errno), ip->ip_ttl, so));
281
282	if (sosendto(pData, so, m) == -1)
283	{
284	m->m_len += iphlen;
285	m->m_data -= iphlen;
286	*ip = save_ip;
287	DEBUG_MISC((dfd,"NAT: UDP tx errno = %d-%s (on sent to %R[IP4])\n", errno,
288	strerror(errno), &ip->ip_dst));
289	icmp_error(pData, m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
290	/* in case we receive ICMP on this socket we'll aware that ICMP has been already sent to host*/
291	so->so_m = NULL;
292	}
293
294	if (so->so_m)
295	m_free(pData, so->so_m); /* used for ICMP if error on sorecvfrom */
296
297	/* restore the orig mbuf packet */
298	m->m_len += iphlen;
299	m->m_data -= iphlen;
300	*ip = save_ip;
301	so->so_m = m; /* ICMP backup */
302
303	return;
304
305	bad:
306	Log2(("NAT: UDP(id: %hd) datagram to %R[IP4] with size(%d) claimed as bad\n",
307	ip->ip_id, &ip->ip_dst, ip->ip_len));
308	done:
309	/* some services like bootp(built-in), dns(buildt-in) and dhcp don't need sockets
310	* and create new m'buffers to send them to guest, so we'll free their incomming
311	* buffers here.
312	*/
313	m_freem(pData, m);
314	return;
315	}
316
317	int udp_output2(PNATState pData, struct socket so, struct mbuf m,
318	struct sockaddr_in saddr, struct sockaddr_in daddr,
319	int iptos)
320	{
321	register struct udpiphdr *ui;
322	int error = 0;
323
324	DEBUG_CALL("udp_output");
325	DEBUG_ARG("so = %lx", (long)so);
326	DEBUG_ARG("m = %lx", (long)m);
327	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
328	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
329
330	/*
331	* Adjust for header
332	*/
333	m->m_data -= sizeof(struct udpiphdr);
334	m->m_len += sizeof(struct udpiphdr);
335
336	/*
337	* Fill in mbuf with extended UDP header
338	* and addresses and length put into network format.
339	*/
340	ui = mtod(m, struct udpiphdr *);
341	memset(ui->ui_x1, 0, 9);
342	ui->ui_pr = IPPROTO_UDP;
343	ui->ui_len = RT_H2N_U16(m->m_len - sizeof(struct ip));
344	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
345	ui->ui_src = saddr->sin_addr;
346	ui->ui_dst = daddr->sin_addr;
347	ui->ui_sport = saddr->sin_port;
348	ui->ui_dport = daddr->sin_port;
349	ui->ui_ulen = ui->ui_len;
350
351	/*
352	* Stuff checksum and output datagram.
353	*/
354	ui->ui_sum = 0;
355	if (udpcksum)
356	{
357	if ((ui->ui_sum = cksum(m, /* sizeof (struct udpiphdr) + */ m->m_len)) == 0)
358	ui->ui_sum = 0xffff;
359	}
360	((struct ip *)ui)->ip_len = m->m_len;
361	((struct ip *)ui)->ip_ttl = ip_defttl;
362	((struct ip *)ui)->ip_tos = iptos;
363
364	udpstat.udps_opackets++;
365
366	error = ip_output(pData, so, m);
367
368	return error;
369	}
370
371	int udp_output(PNATState pData, struct socket so, struct mbuf m,
372	struct sockaddr_in *addr)
373	{
374	struct sockaddr_in saddr, daddr;
375
376	saddr = *addr;
377	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
378	{
379	saddr.sin_addr.s_addr = so->so_faddr.s_addr;
380	if ((so->so_faddr.s_addr & RT_H2N_U32(~pData->netmask)) == RT_H2N_U32(~pData->netmask))
381	saddr.sin_addr.s_addr = alias_addr.s_addr;
382	}
383
384	/* Any UDP packet to the loopback address must be translated to be from
385	* the forwarding address, i.e. 10.0.2.2. */
386	if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
387	== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
388	saddr.sin_addr.s_addr = alias_addr.s_addr;
389
390	daddr.sin_addr = so->so_laddr;
391	daddr.sin_port = so->so_lport;
392
393	return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
394	}
395
396	int
397	udp_attach(PNATState pData, struct socket *so, int service_port)
398	{
399	struct sockaddr_in *addr;
400	struct sockaddr sa_addr;
401	socklen_t socklen = sizeof(struct sockaddr);
402	int status;
403	int opt = 1;
404
405	if ((so->s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
406	goto error;
407	/*
408	* Here, we bind() the socket. Although not really needed
409	* (sendto() on an unbound socket will bind it), it's done
410	* here so that emulation of ytalk etc. don't have to do it
411	*/
412	memset(&sa_addr, 0, sizeof(struct sockaddr));
413	addr = (struct sockaddr_in *)&sa_addr;
414	#ifdef RT_OS_DARWIN
415	addr->sin_len = sizeof(struct sockaddr_in);
416	#endif
417	addr->sin_family = AF_INET;
418	addr->sin_port = service_port;
419	addr->sin_addr.s_addr = pData->bindIP.s_addr;
420	fd_nonblock(so->s);
421	if (bind(so->s, &sa_addr, sizeof(struct sockaddr_in)) < 0)
422	{
423	int lasterrno = errno;
424	closesocket(so->s);
425	so->s = -1;
426	#ifdef RT_OS_WINDOWS
427	WSASetLastError(lasterrno);
428	#else
429	errno = lasterrno;
430	#endif
431	goto error;
432	}
433	/* success, insert in queue */
434	so->so_expire = curtime + SO_EXPIRE;
435	/* enable broadcast for later use */
436	setsockopt(so->s, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(opt));
437	status = getsockname(so->s, &sa_addr, &socklen);
438	Assert(status == 0 && sa_addr.sa_family == AF_INET);
439	so->so_hlport = ((struct sockaddr_in *)&sa_addr)->sin_port;
440	so->so_hladdr.s_addr = ((struct sockaddr_in *)&sa_addr)->sin_addr.s_addr;
441	SOCKET_LOCK_CREATE(so);
442	QSOCKET_LOCK(udb);
443	insque(pData, so, &udb);
444	NSOCK_INC();
445	QSOCKET_UNLOCK(udb);
446	return so->s;
447	error:
448	LogRel(("NAT: can't create datagramm socket\n"));
449	return -1;
450	}
451
452	void
453	udp_detach(PNATState pData, struct socket *so)
454	{
455	if (so != &pData->icmp_socket)
456	{
457	QSOCKET_LOCK(udb);
458	SOCKET_LOCK(so);
459	QSOCKET_UNLOCK(udb);
460	closesocket(so->s);
461	sofree(pData, so);
462	SOCKET_UNLOCK(so);
463	}
464	}
465
466	static const struct tos_t udptos[] =
467	{
468	{ 0, 53, IPTOS_LOWDELAY, 0 }, /* DNS */
469	{ 517, 517, IPTOS_LOWDELAY, EMU_TALK }, /* talk */
470	{ 518, 518, IPTOS_LOWDELAY, EMU_NTALK }, /* ntalk */
471	{ 0, 7648, IPTOS_LOWDELAY, EMU_CUSEEME }, /* Cu-Seeme */
472	{ 0, 0, 0, 0 }
473	};
474
475	u_int8_t
476	udp_tos(struct socket *so)
477	{
478	int i = 0;
479
480	while(udptos[i].tos)
481	{
482	if ( (udptos[i].fport && RT_N2H_U16(so->so_fport) == udptos[i].fport)
483	\|\| (udptos[i].lport && RT_N2H_U16(so->so_lport) == udptos[i].lport))
484	{
485	so->so_emu = udptos[i].emu;
486	return udptos[i].tos;
487	}
488	i++;
489	}
490
491	return 0;
492	}
493
494	#ifdef EMULATE_TALK
495	#include "talkd.h"
496	#endif
497
498	/*
499	* Here, talk/ytalk/ntalk requests must be emulated
500	*/
501	void
502	udp_emu(PNATState pData, struct socket so, struct mbuf m)
503	{
504	so->so_emu = 0;
505	}
506
507	struct socket *
508	udp_listen(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
509	{
510	struct sockaddr_in addr;
511	struct socket *so;
512	socklen_t addrlen = sizeof(struct sockaddr_in);
513	int opt = 1;
514
515	if ((so = socreate()) == NULL)
516	return NULL;
517
518	so->s = socket(AF_INET, SOCK_DGRAM, 0);
519	if (so->s == -1)
520	{
521	LogRel(("NAT: can't create datagram socket\n"));
522	RTMemFree(so);
523	return NULL;
524	}
525	so->so_expire = curtime + SO_EXPIRE;
526	fd_nonblock(so->s);
527	SOCKET_LOCK_CREATE(so);
528	QSOCKET_LOCK(udb);
529	insque(pData, so, &udb);
530	NSOCK_INC();
531	QSOCKET_UNLOCK(udb);
532
533	memset(&addr, 0, sizeof(addr));
534	#ifdef RT_OS_DARWIN
535	addr.sin_len = sizeof(addr);
536	#endif
537	addr.sin_family = AF_INET;
538	addr.sin_addr.s_addr = bind_addr;
539	addr.sin_port = port;
540
541	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0)
542	{
543	LogRel(("NAT: bind to %R[IP4] has been failed\n", &addr.sin_addr));
544	udp_detach(pData, so);
545	return NULL;
546	}
547	setsockopt(so->s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int));
548	/* setsockopt(so->s, SOL_SOCKET, SO_OOBINLINE,(char )&opt, sizeof(int)); /
549
550	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
551	so->so_fport = addr.sin_port;
552	/* The original check was completely broken, as the commented out
553	* if statement was always true (INADDR_ANY=0). */
554	/* if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr) */
555	if (1 == 0) /* always use the else part */
556	so->so_faddr = alias_addr;
557	else
558	so->so_faddr = addr.sin_addr;
559
560	so->so_lport = lport;
561	so->so_laddr.s_addr = laddr;
562	if (flags != SS_FACCEPTONCE)
563	so->so_expire = 0;
564
565	so->so_state = SS_ISFCONNECTED;
566
567	return so;
568	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/udp.c@ 26594

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