slirp.c@ 13604

Last change on this file since 13604 was 13604, checked in by vboxsync, 16 years ago
Synchronized slirp was inroduced
Property svn:eol-style set to `native`
File size: 26.4 KB

Line
1	#include "slirp.h"
2	#ifdef RT_OS_OS2
3	# include <paths.h>
4	#endif
5
6	#include <VBox/err.h>
7	#include <iprt/assert.h>
8	#ifdef VBOX_WITH_SYNC_SLIRP
9	#include <iprt/semaphore.h>
10	#endif
11
12	static const uint8_t special_ethaddr[6] = {
13	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
14	};
15
16	#ifdef _WIN32
17
18	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
19	struct in_addr *pdns_addr,
20	const char **ppszDomain)
21	{
22	int rc = 0;
23	FIXED_INFO *FixedInfo=NULL;
24	ULONG BufLen;
25	DWORD ret;
26	IP_ADDR_STRING *pIPAddr;
27	struct in_addr tmp_addr;
28
29	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
30	BufLen = sizeof(FIXED_INFO);
31
32	/** @todo: this API returns all DNS servers, no matter whether the
33	* corresponding network adapter is disabled or not. Maybe replace
34	* this by GetAdapterAddresses(), which is XP/Vista only though. */
35	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
36	if (FixedInfo) {
37	GlobalFree(FixedInfo);
38	FixedInfo = NULL;
39	}
40	FixedInfo = GlobalAlloc(GPTR, BufLen);
41	}
42
43	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
44	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
45	if (FixedInfo) {
46	GlobalFree(FixedInfo);
47	FixedInfo = NULL;
48	}
49	rc = -1;
50	goto get_dns_prefix;
51	}
52
53	pIPAddr = &(FixedInfo->DnsServerList);
54	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
55	Log(("nat: DNS Servers:\n"));
56	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
57	LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
58	*pdns_addr = tmp_addr;
59
60	pIPAddr = FixedInfo -> DnsServerList.Next;
61	while ( pIPAddr )
62	{
63	if (fVerbose)
64	LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
65	pIPAddr = pIPAddr ->Next;
66	}
67	if (FixedInfo) {
68	GlobalFree(FixedInfo);
69	FixedInfo = NULL;
70	}
71
72	get_dns_prefix:
73	if (ppszDomain)
74	{
75	OSVERSIONINFO ver;
76	char szDnsDomain[256];
77	DWORD dwSize = sizeof(szDnsDomain);
78
79	*ppszDomain = NULL;
80	GetVersionEx(&ver);
81	if (ver.dwMajorVersion >= 5)
82	{
83	/* GetComputerNameEx exists in Windows versions starting with 2000. */
84	if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
85	{
86	if (szDnsDomain[0])
87	{
88	/* Just non-empty strings are valid. */
89	*ppszDomain = RTStrDup(szDnsDomain);
90	if (pData->fPassDomain)
91	{
92	if (fVerbose)
93	LogRel(("NAT: passing domain name %s\n", szDnsDomain));
94	}
95	else
96	Log(("nat: ignoring domain %s\n", szDnsDomain));
97	}
98	}
99	else
100	Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
101	}
102	}
103	return rc;
104	}
105
106	#else
107
108	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
109	struct in_addr *pdns_addr,
110	const char **ppszDomain)
111	{
112	char buff[512];
113	char buff2[256];
114	FILE *f;
115	int found = 0;
116	struct in_addr tmp_addr;
117
118	#ifdef RT_OS_OS2
119	/* Try various locations. */
120	char *etc = getenv("ETC");
121	f = NULL;
122	if (etc)
123	{
124	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
125	f = fopen(buff, "rt");
126	}
127	if (!f) {
128	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
129	f = fopen(buff, "rt");
130	}
131	if (!f) {
132	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
133	f = fopen(buff, "rt");
134	}
135	#else
136	f = fopen("/etc/resolv.conf", "r");
137	#endif
138	if (!f)
139	return -1;
140
141	if (ppszDomain)
142	*ppszDomain = NULL;
143	Log(("nat: DNS Servers:\n"));
144	while (fgets(buff, 512, f) != NULL) {
145	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
146	if (!inet_aton(buff2, &tmp_addr))
147	continue;
148	if (tmp_addr.s_addr == loopback_addr.s_addr)
149	tmp_addr = our_addr;
150	/* If it's the first one, set it to dns_addr */
151	if (!found)
152	{
153	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
154	LogRel(("NAT: DNS address: %s\n", buff2));
155	*pdns_addr = tmp_addr;
156	}
157	else
158	{
159	if (fVerbose)
160	LogRel(("NAT: ignored DNS address: %s\n", buff2));
161	}
162	found++;
163	}
164	if ( ppszDomain
165	&& (!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6)))
166	{
167	/* Domain name/search list present. Pick first entry */
168	if (*ppszDomain == NULL)
169	{
170	char *tok;
171	char *saveptr;
172	tok = strtok_r(&buff[6], " \t\n", &saveptr);
173	if (tok)
174	{
175	*ppszDomain = RTStrDup(tok);
176	if (pData->fPassDomain)
177	{
178	if (fVerbose)
179	LogRel(("NAT: passing domain name %s\n", tok));
180	}
181	else
182	Log(("nat: ignoring domain %s\n", tok));
183	}
184	}
185	}
186	}
187	fclose(f);
188	if (!found)
189	return -1;
190	return 0;
191	}
192
193	#endif
194
195	int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
196	{
197	return get_dns_addr_domain(pData, false, pdns_addr, NULL);
198	}
199
200	int slirp_init(PNATState ppData, const char pszNetAddr, uint32_t u32Netmask,
201	bool fPassDomain, const char *pszTFTPPrefix,
202	const char pszBootFile, void pvUser)
203	{
204	int fNATfailed = 0;
205	#ifdef VBOX_WITH_SYNC_SLIRP
206	int rc = 0;
207	#endif
208	PNATState pData = malloc(sizeof(NATState));
209	*ppData = pData;
210	if (!pData)
211	return VERR_NO_MEMORY;
212	if (u32Netmask & 0x1f)
213	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
214	return VERR_INVALID_PARAMETER;
215	memset(pData, '\0', sizeof(NATState));
216	pData->fPassDomain = fPassDomain;
217	pData->pvUser = pvUser;
218	#if ARCH_BITS == 64
219	pData->cpvHashUsed = 1;
220	#endif
221	tftp_prefix = pszTFTPPrefix;
222	bootp_filename = pszBootFile;
223	pData->netmask = u32Netmask;
224
225	#ifdef _WIN32
226	{
227	WSADATA Data;
228	WSAStartup(MAKEWORD(2,0), &Data);
229	}
230	#endif
231
232	#ifdef VBOX_WITH_SYNC_SLIRP
233	rc = RTSemMutexCreate(&pData->tcb_mutex);
234	AssertReleaseRC(rc);
235	rc = RTSemMutexCreate(&pData->udb_mutex);
236	AssertReleaseRC(rc);
237	rc = RTSemMutexCreate(&pData->if_queued_mutex);
238	AssertReleaseRC(rc);
239	rc = RTSemMutexCreate(&pData->next_m_mutex);
240	AssertReleaseRC(rc);
241	#endif
242
243	Assert(sizeof(struct ip) == 20);
244	link_up = 1;
245
246	if_init(pData);
247	ip_init(pData);
248
249	/* Initialise mbufs after setting the MTU */
250	m_init(pData);
251
252	/* set default addresses */
253	inet_aton("127.0.0.1", &loopback_addr);
254	inet_aton("127.0.0.1", &dns_addr);
255
256	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
257	fNATfailed = 1;
258
259	inet_aton(pszNetAddr, &special_addr);
260	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
261	getouraddr(pData);
262	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
263	}
264
265	/**
266	* Marks the link as up, making it possible to establish new connections.
267	*/
268	void slirp_link_up(PNATState pData)
269	{
270	link_up = 1;
271	}
272
273	/**
274	* Marks the link as down and cleans up the current connections.
275	*/
276	void slirp_link_down(PNATState pData)
277	{
278	struct socket *so;
279
280	while ((so = tcb.so_next) != &tcb)
281	{
282	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
283	sofree(pData, so);
284	else
285	tcp_drop(pData, sototcpcb(so), 0);
286	}
287
288	while ((so = udb.so_next) != &udb)
289	udp_detach(pData, so);
290
291	link_up = 0;
292	}
293
294	/**
295	* Terminates the slirp component.
296	*/
297	void slirp_term(PNATState pData)
298	{
299	if (pData->pszDomain)
300	RTStrFree((char )(void )pData->pszDomain);
301
302	#if ARCH_BITS == 64
303	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
304	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
305	#endif
306
307	slirp_link_down(pData);
308	#ifdef WIN32
309	WSACleanup();
310	#endif
311	#ifdef LOG_ENABLED
312	Log(("\n"
313	"NAT statistics\n"
314	"--------------\n"
315	"\n"));
316	ipstats(pData);
317	tcpstats(pData);
318	udpstats(pData);
319	icmpstats(pData);
320	mbufstats(pData);
321	sockstats(pData);
322	Log(("\n"
323	"\n"
324	"\n"));
325	#endif
326	free(pData);
327	}
328
329
330	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
331	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
332	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
333
334	/*
335	* curtime kept to an accuracy of 1ms
336	*/
337	#ifdef _WIN32
338	static void updtime(PNATState pData)
339	{
340	struct _timeb tb;
341
342	_ftime(&tb);
343	curtime = (u_int)tb.time * (u_int)1000;
344	curtime += (u_int)tb.millitm;
345	}
346	#else
347	static void updtime(PNATState pData)
348	{
349	gettimeofday(&tt, 0);
350
351	curtime = (u_int)tt.tv_sec * (u_int)1000;
352	curtime += (u_int)tt.tv_usec / (u_int)1000;
353
354	if ((tt.tv_usec % 1000) >= 500)
355	curtime++;
356	}
357	#endif
358
359	void slirp_select_fill(PNATState pData, int *pnfds,
360	fd_set readfds, fd_set writefds, fd_set *xfds)
361	{
362	struct socket so, so_next;
363	struct timeval timeout;
364	int nfds;
365	int tmp_time;
366
367	nfds = *pnfds;
368	/*
369	* First, TCP sockets
370	*/
371	do_slowtimo = 0;
372	if (link_up) {
373	/*
374	* *_slowtimo needs calling if there are IP fragments
375	* in the fragment queue, or there are TCP connections active
376	*/
377	#ifndef VBOX_WITH_SYNC_SLIRP
378	do_slowtimo = ((tcb.so_next != &tcb) \|\|
379	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
380
381	for (so = tcb.so_next; so != &tcb; so = so_next) {
382	so_next = so->so_next;
383	#else
384	RTSemMutexRequest(pData->tcb_mutex, RT_INDEFINITE_WAIT);
385	so = tcb.so_next;
386	do_slowtimo = ((so != &tcb) \|\|
387	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
388	while (1) {
389	if (so == &tcb) {
390	RTSemMutexRelease(pData->tcb_mutex);
391	break;
392	}
393	so_next = so->so_next;
394	RTSemMutexRequest(so->so_mutex, RT_INDEFINITE_WAIT);
395	RTSemMutexRelease(pData->tcb_mutex);
396	#endif
397
398	/*
399	* See if we need a tcp_fasttimo
400	*/
401	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
402	time_fasttimo = curtime; /* Flag when we want a fasttimo */
403
404	/*
405	* NOFDREF can include still connecting to local-host,
406	* newly socreated() sockets etc. Don't want to select these.
407	*/
408	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
409	#ifndef VBOX_WITH_SYNC_SLIRP
410	continue;
411	#else
412	goto before_loop_ends;
413	#endif
414
415	/*
416	* Set for reading sockets which are accepting
417	*/
418	if (so->so_state & SS_FACCEPTCONN) {
419	FD_SET(so->s, readfds);
420	UPD_NFDS(so->s);
421	#ifndef VBOX_WITH_SYNC_SLIRP
422	continue;
423	#else
424	goto before_loop_ends;
425	#endif
426	}
427
428	/*
429	* Set for writing sockets which are connecting
430	*/
431	if (so->so_state & SS_ISFCONNECTING) {
432	FD_SET(so->s, writefds);
433	UPD_NFDS(so->s);
434	#ifndef VBOX_WITH_SYNC_SLIRP
435	continue;
436	#else
437	goto before_loop_ends;
438	#endif
439	}
440
441	/*
442	* Set for writing if we are connected, can send more, and
443	* we have something to send
444	*/
445	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
446	FD_SET(so->s, writefds);
447	UPD_NFDS(so->s);
448	}
449
450	/*
451	* Set for reading (and urgent data) if we are connected, can
452	* receive more, and we have room for it XXX /2 ?
453	*/
454	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
455	FD_SET(so->s, readfds);
456	FD_SET(so->s, xfds);
457	UPD_NFDS(so->s);
458	}
459	#ifdef VBOX_WITH_SYNC_SLIRP
460	before_loop_ends:
461	/Release of global tcb mutex happens in the head of loop/
462	RTSemMutexRequest(pData->tcb_mutex, RT_INDEFINITE_WAIT);
463	RTSemMutexRelease(so->so_mutex);
464	so = so_next;
465	#endif
466	}
467
468	/*
469	* UDP sockets
470	*/
471	#ifndef VBOX_WITH_SYNC_SLIRP
472	for (so = udb.so_next; so != &udb; so = so_next) {
473	so_next = so->so_next;
474	#else
475	RTSemMutexRequest(pData->udb_mutex, RT_INDEFINITE_WAIT);
476	so = udb.so_next;
477	while(1) {
478	if (so == &udb) {
479	RTSemMutexRelease(pData->udb_mutex);
480	break;
481	}
482	so_next = so->so_next;
483	RTSemMutexRequest(so->so_mutex, RT_INDEFINITE_WAIT);
484	RTSemMutexRelease(pData->udb_mutex);
485	#endif
486
487	/*
488	* See if it's timed out
489	*/
490	if (so->so_expire) {
491	if (so->so_expire <= curtime) {
492	udp_detach(pData, so);
493	#ifndef VBOX_WITH_SYNC_SLIRP
494	continue;
495	#else
496	goto before_udp_loop_end;
497	#endif
498	} else
499	do_slowtimo = 1; /* Let socket expire */
500	}
501
502	/*
503	* When UDP packets are received from over the
504	* link, they're sendto()'d straight away, so
505	* no need for setting for writing
506	* Limit the number of packets queued by this session
507	* to 4. Note that even though we try and limit this
508	* to 4 packets, the session could have more queued
509	* if the packets needed to be fragmented
510	* (XXX <= 4 ?)
511	*/
512	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
513	FD_SET(so->s, readfds);
514	UPD_NFDS(so->s);
515	}
516	#ifdef VBOX_WITH_SYNC_SLIRP
517	before_udp_loop_end:
518	RTSemMutexRequest(pData->udb_mutex, RT_INDEFINITE_WAIT);
519	RTSemMutexRelease(so->so_mutex);
520	so = so_next;
521	#endif
522	}
523	}
524
525	/*
526	* Setup timeout to use minimum CPU usage, especially when idle
527	*/
528
529	/*
530	* First, see the timeout needed by *timo
531	*/
532	timeout.tv_sec = 0;
533	timeout.tv_usec = -1;
534	/*
535	* If a slowtimo is needed, set timeout to 500ms from the last
536	* slow timeout. If a fast timeout is needed, set timeout within
537	* 200ms of when it was requested.
538	*/
539	if (do_slowtimo) {
540	/* XXX + 10000 because some select()'s aren't that accurate */
541	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
542	if (timeout.tv_usec < 0)
543	timeout.tv_usec = 0;
544	else if (timeout.tv_usec > 510000)
545	timeout.tv_usec = 510000;
546
547	/* Can only fasttimo if we also slowtimo */
548	if (time_fasttimo) {
549	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
550	if (tmp_time < 0)
551	tmp_time = 0;
552
553	/* Choose the smallest of the 2 */
554	if (tmp_time < timeout.tv_usec)
555	timeout.tv_usec = (u_int)tmp_time;
556	}
557	}
558	*pnfds = nfds;
559	}
560
561	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
562	{
563	struct socket so, so_next;
564	int ret;
565
566	/* Update time */
567	updtime(pData);
568
569	/*
570	* See if anything has timed out
571	*/
572	if (link_up) {
573	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
574	tcp_fasttimo(pData);
575	time_fasttimo = 0;
576	}
577	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
578	ip_slowtimo(pData);
579	tcp_slowtimo(pData);
580	last_slowtimo = curtime;
581	}
582	}
583
584	/*
585	* Check sockets
586	*/
587	if (link_up) {
588	/*
589	* Check TCP sockets
590	*/
591	#ifndef VBOX_WITH_SYNC_SLIRP
592	for (so = tcb.so_next; so != &tcb; so = so_next) {
593	so_next = so->so_next;
594	#else
595	RTSemMutexRequest(pData->tcb_mutex, RT_INDEFINITE_WAIT);
596	so = tcb.so_next;
597	while (1) {
598	if (so == &tcb) {
599	RTSemMutexRelease(pData->tcb_mutex);
600	break;
601	}
602	so_next = so->so_next;
603	RTSemMutexRequest(so->so_mutex, RT_INDEFINITE_WAIT);
604	RTSemMutexRelease(pData->tcb_mutex);
605	#endif
606
607	/*
608	* FD_ISSET is meaningless on these sockets
609	* (and they can crash the program)
610	*/
611	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
612	#ifndef VBOX_WITH_SYNC_SLIRP
613	continue;
614	#else
615	goto before_loop_ends;
616	#endif
617
618	/*
619	* Check for URG data
620	* This will soread as well, so no need to
621	* test for readfds below if this succeeds
622	*/
623	if (FD_ISSET(so->s, xfds))
624	sorecvoob(pData, so);
625	/*
626	* Check sockets for reading
627	*/
628	else if (FD_ISSET(so->s, readfds)) {
629	/*
630	* Check for incoming connections
631	*/
632	if (so->so_state & SS_FACCEPTCONN) {
633	tcp_connect(pData, so);
634	#ifndef VBOX_WITH_SYNC_SLIRP
635	continue;
636	#else
637	goto before_loop_ends;
638	#endif
639	} /* else */
640	ret = soread(pData, so);
641
642	/* Output it if we read something */
643	if (ret > 0)
644	tcp_output(pData, sototcpcb(so));
645	}
646
647	/*
648	* Check sockets for writing
649	*/
650	if (FD_ISSET(so->s, writefds)) {
651	/*
652	* Check for non-blocking, still-connecting sockets
653	*/
654	if (so->so_state & SS_ISFCONNECTING) {
655	/* Connected */
656	so->so_state &= ~SS_ISFCONNECTING;
657
658	/*
659	* This should be probably guarded by PROBE_CONN too. Anyway,
660	* we disable it on OS/2 because the below send call returns
661	* EFAULT which causes the opened TCP socket to close right
662	* after it has been opened and connected.
663	*/
664	#ifndef RT_OS_OS2
665	ret = send(so->s, (const char *)&ret, 0, 0);
666	if (ret < 0) {
667	/* XXXXX Must fix, zero bytes is a NOP */
668	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
669	errno == EINPROGRESS \|\| errno == ENOTCONN)
670	#ifndef VBOX_WITH_SYNC_SLIRP
671	continue;
672	#else
673	goto before_loop_ends;
674	#endif
675
676	/* else failed */
677	so->so_state = SS_NOFDREF;
678	}
679	/* else so->so_state &= ~SS_ISFCONNECTING; */
680	#endif
681
682	/*
683	* Continue tcp_input
684	*/
685	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
686	/* continue; */
687	} else
688	ret = sowrite(pData, so);
689	/*
690	* XXXXX If we wrote something (a lot), there
691	* could be a need for a window update.
692	* In the worst case, the remote will send
693	* a window probe to get things going again
694	*/
695	}
696
697	/*
698	* Probe a still-connecting, non-blocking socket
699	* to check if it's still alive
700	*/
701	#ifdef PROBE_CONN
702	if (so->so_state & SS_ISFCONNECTING) {
703	ret = recv(so->s, (char *)&ret, 0,0);
704
705	if (ret < 0) {
706	/* XXX */
707	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
708	errno == EINPROGRESS \|\| errno == ENOTCONN)
709	#ifndef VBOX_WITH_SYNC_SLIRP
710	continue;/* Still connecting, continue */
711	#else
712	goto before_loop_ends;
713	#endif
714
715	/* else failed */
716	so->so_state = SS_NOFDREF;
717
718	/* tcp_input will take care of it */
719	} else {
720	ret = send(so->s, &ret, 0,0);
721	if (ret < 0) {
722	/* XXX */
723	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
724	errno == EINPROGRESS \|\| errno == ENOTCONN)
725	#ifndef VBOX_WITH_SYNC_SLIRP
726	continue;
727	#else
728	goto before_loop_ends;
729	#endif
730	/* else failed */
731	so->so_state = SS_NOFDREF;
732	} else
733	so->so_state &= ~SS_ISFCONNECTING;
734
735	}
736	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
737	} /* SS_ISFCONNECTING */
738	#endif
739	#ifdef VBOX_WITH_SYNC_SLIRP
740	before_loop_ends:
741	RTSemMutexRequest(pData->tcb_mutex, RT_INDEFINITE_WAIT);
742	RTSemMutexRelease(so->so_mutex);
743	so = so_next;
744	#endif
745	}
746
747	/*
748	* Now UDP sockets.
749	* Incoming packets are sent straight away, they're not buffered.
750	* Incoming UDP data isn't buffered either.
751	*/
752	#ifndef VBOX_WITH_SYNC_SLIRP
753	for (so = udb.so_next; so != &udb; so = so_next) {
754	so_next = so->so_next;
755	#else
756	RTSemMutexRequest(pData->udb_mutex, RT_INDEFINITE_WAIT);
757	so = udb.so_next;
758	while(1) {
759	if (so == &udb) {
760	RTSemMutexRelease(pData->udb_mutex);
761	break;
762	}
763	so_next = so->so_next;
764	RTSemMutexRequest(so->so_mutex, RT_INDEFINITE_WAIT);
765	RTSemMutexRelease(pData->udb_mutex);
766	#endif
767
768	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
769	sorecvfrom(pData, so);
770	}
771	#ifdef VBOX_WITH_SYNC_SLIRP
772	RTSemMutexRequest(pData->udb_mutex, RT_INDEFINITE_WAIT);
773	RTSemMutexRelease(so->so_mutex);
774	so = so_next;
775	#endif
776	}
777	}
778
779	/*
780	* See if we can start outputting
781	*/
782	#ifndef VBOX_WITH_SYNC_SLIRP
783	if (if_queued && link_up)
784	if_start(pData);
785	#else
786	#if 0
787	if (link_up) {
788	RTSemMutexRequest(pData->if_queued_mutex, RT_INDEFINITE_WAIT);
789	if (if_queued > 0){
790	RTSemMutexRelease(pData->if_queued_mutex);
791	if_start(pData);
792	}
793	else {
794	RTSemMutexRelease(pData->if_queued_mutex);
795	}
796	}
797	#endif
798	#endif
799	}
800
801	#define ETH_ALEN 6
802	#define ETH_HLEN 14
803
804	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
805	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
806
807	#define ARPOP_REQUEST 1 /* ARP request */
808	#define ARPOP_REPLY 2 /* ARP reply */
809
810	struct ethhdr
811	{
812	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
813	unsigned char h_source[ETH_ALEN]; /* source ether addr */
814	unsigned short h_proto; /* packet type ID field */
815	};
816
817	struct arphdr
818	{
819	unsigned short ar_hrd; /* format of hardware address */
820	unsigned short ar_pro; /* format of protocol address */
821	unsigned char ar_hln; /* length of hardware address */
822	unsigned char ar_pln; /* length of protocol address */
823	unsigned short ar_op; /* ARP opcode (command) */
824
825	/*
826	* Ethernet looks like this : This bit is variable sized however...
827	*/
828	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
829	unsigned char ar_sip[4]; /* sender IP address */
830	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
831	unsigned char ar_tip[4]; /* target IP address */
832	};
833
834	static
835	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
836	{
837	struct ethhdr eh = (struct ethhdr )pkt;
838	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
839	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
840	struct ethhdr reh = (struct ethhdr )arp_reply;
841	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
842	int ar_op;
843	struct ex_list *ex_ptr;
844	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
845
846	ar_op = ntohs(ah->ar_op);
847	switch(ar_op) {
848	case ARPOP_REQUEST:
849	if ((htip & pData->netmask) == ntohl(special_addr.s_addr)) {
850	if ( (htip & ~pData->netmask) == CTL_DNS
851	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
852	goto arp_ok;
853	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
854	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
855	goto arp_ok;
856	}
857	return;
858	arp_ok:
859	/* XXX: make an ARP request to have the client address */
860	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
861
862	/* ARP request for alias/dns mac address */
863	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
864	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
865	reh->h_source[5] = ah->ar_tip[3];
866	reh->h_proto = htons(ETH_P_ARP);
867
868	rah->ar_hrd = htons(1);
869	rah->ar_pro = htons(ETH_P_IP);
870	rah->ar_hln = ETH_ALEN;
871	rah->ar_pln = 4;
872	rah->ar_op = htons(ARPOP_REPLY);
873	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
874	memcpy(rah->ar_sip, ah->ar_tip, 4);
875	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
876	memcpy(rah->ar_tip, ah->ar_sip, 4);
877	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
878	}
879	break;
880	default:
881	break;
882	}
883	}
884
885	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
886	{
887	struct mbuf *m;
888	int proto;
889
890	if (pkt_len < ETH_HLEN)
891	return;
892
893	proto = ntohs((uint16_t )(pkt + 12));
894	switch(proto) {
895	case ETH_P_ARP:
896	arp_input(pData, pkt, pkt_len);
897	break;
898	case ETH_P_IP:
899	/* Update time. Important if the network is very quiet, as otherwise
900	* the first outgoing connection gets an incorrect timestamp. */
901	updtime(pData);
902
903	m = m_get(pData);
904	if (!m)
905	return;
906	/* Note: we add to align the IP header */
907	if (M_FREEROOM(m) < pkt_len + 2) {
908	m_inc(m, pkt_len + 2);
909	}
910	m->m_len = pkt_len + 2;
911	memcpy(m->m_data + 2, pkt, pkt_len);
912
913	m->m_data += 2 + ETH_HLEN;
914	m->m_len -= 2 + ETH_HLEN;
915
916	ip_input(pData, m);
917	break;
918	default:
919	break;
920	}
921	}
922
923	/* output the IP packet to the ethernet device */
924	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
925	{
926	uint8_t buf[1600];
927	struct ethhdr eh = (struct ethhdr )buf;
928
929	if (ip_data_len + ETH_HLEN > sizeof(buf))
930	return;
931
932	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
933	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
934	/* XXX: not correct */
935	eh->h_source[5] = CTL_ALIAS;
936	eh->h_proto = htons(ETH_P_IP);
937	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
938	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
939	}
940
941	int slirp_redir(PNATState pData, int is_udp, int host_port,
942	struct in_addr guest_addr, int guest_port)
943	{
944	if (is_udp) {
945	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
946	htons(guest_port), 0))
947	return -1;
948	} else {
949	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
950	htons(guest_port), 0))
951	return -1;
952	}
953	return 0;
954	}
955
956	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
957	int guest_port)
958	{
959	return add_exec(&exec_list, do_pty, (char *)args,
960	addr_low_byte, htons(guest_port));
961	}
962
963	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
964	{
965	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
966	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 13604

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