slirp.c@ 13733

Last change on this file since 13733 was 13733, checked in by vboxsync, 16 years ago
The rest of macro replacment was added
Property svn:eol-style set to `native`
File size: 25.5 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	PNATState pData = malloc(sizeof(NATState));
206	*ppData = pData;
207	if (!pData)
208	return VERR_NO_MEMORY;
209	if (u32Netmask & 0x1f)
210	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
211	return VERR_INVALID_PARAMETER;
212	memset(pData, '\0', sizeof(NATState));
213	pData->fPassDomain = fPassDomain;
214	pData->pvUser = pvUser;
215	#if ARCH_BITS == 64
216	pData->cpvHashUsed = 1;
217	#endif
218	tftp_prefix = pszTFTPPrefix;
219	bootp_filename = pszBootFile;
220	pData->netmask = u32Netmask;
221
222	#ifdef _WIN32
223	{
224	WSADATA Data;
225	WSAStartup(MAKEWORD(2,0), &Data);
226	}
227	#endif
228
229	VBOX_SLIRP_LOCK_CREATE(&pData->tcb_mutex);
230	VBOX_SLIRP_LOCK_CREATE(&pData->tcp_last_so_mutex);
231	VBOX_SLIRP_LOCK_CREATE(&pData->udb_mutex);
232	VBOX_SLIRP_LOCK_CREATE(&pData->udp_last_so_mutex);
233	VBOX_SLIRP_LOCK_CREATE(&pData->if_queued_mutex);
234	VBOX_SLIRP_LOCK_CREATE(&pData->next_m_mutex);
235
236	Assert(sizeof(struct ip) == 20);
237	link_up = 1;
238
239	if_init(pData);
240	ip_init(pData);
241
242	/* Initialise mbufs after setting the MTU */
243	m_init(pData);
244
245	/* set default addresses */
246	inet_aton("127.0.0.1", &loopback_addr);
247	inet_aton("127.0.0.1", &dns_addr);
248
249	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
250	fNATfailed = 1;
251
252	inet_aton(pszNetAddr, &special_addr);
253	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
254	getouraddr(pData);
255	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
256	}
257
258	/**
259	* Marks the link as up, making it possible to establish new connections.
260	*/
261	void slirp_link_up(PNATState pData)
262	{
263	link_up = 1;
264	}
265
266	/**
267	* Marks the link as down and cleans up the current connections.
268	*/
269	void slirp_link_down(PNATState pData)
270	{
271	struct socket *so;
272
273	while ((so = tcb.so_next) != &tcb)
274	{
275	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
276	sofree(pData, so);
277	else
278	tcp_drop(pData, sototcpcb(so), 0);
279	}
280
281	while ((so = udb.so_next) != &udb)
282	udp_detach(pData, so);
283
284	link_up = 0;
285	}
286
287	/**
288	* Terminates the slirp component.
289	*/
290	void slirp_term(PNATState pData)
291	{
292	if (pData->pszDomain)
293	RTStrFree((char )(void )pData->pszDomain);
294
295	#if ARCH_BITS == 64
296	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
297	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
298	#endif
299
300	slirp_link_down(pData);
301	#ifdef WIN32
302	WSACleanup();
303	#endif
304	#ifdef LOG_ENABLED
305	Log(("\n"
306	"NAT statistics\n"
307	"--------------\n"
308	"\n"));
309	ipstats(pData);
310	tcpstats(pData);
311	udpstats(pData);
312	icmpstats(pData);
313	mbufstats(pData);
314	sockstats(pData);
315	Log(("\n"
316	"\n"
317	"\n"));
318	#endif
319	free(pData);
320	}
321
322
323	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
324	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
325	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
326
327	/*
328	* curtime kept to an accuracy of 1ms
329	*/
330	#ifdef _WIN32
331	static void updtime(PNATState pData)
332	{
333	struct _timeb tb;
334
335	_ftime(&tb);
336	curtime = (u_int)tb.time * (u_int)1000;
337	curtime += (u_int)tb.millitm;
338	}
339	#else
340	static void updtime(PNATState pData)
341	{
342	gettimeofday(&tt, 0);
343
344	curtime = (u_int)tt.tv_sec * (u_int)1000;
345	curtime += (u_int)tt.tv_usec / (u_int)1000;
346
347	if ((tt.tv_usec % 1000) >= 500)
348	curtime++;
349	}
350	#endif
351
352	void slirp_select_fill(PNATState pData, int *pnfds,
353	fd_set readfds, fd_set writefds, fd_set *xfds)
354	{
355	struct socket so, so_next;
356	struct timeval timeout;
357	int nfds;
358	int tmp_time;
359
360	nfds = *pnfds;
361	/*
362	* First, TCP sockets
363	*/
364	do_slowtimo = 0;
365	if (link_up) {
366	/*
367	* *_slowtimo needs calling if there are IP fragments
368	* in the fragment queue, or there are TCP connections active
369	*/
370	VBOX_SLIRP_LOCK(pData->tcb_mutex);
371	do_slowtimo = ((tcb.so_next != &tcb) \|\|
372	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
373
374	so = tcb.so_next;
375	#ifndef VBOX_WITH_SYNC_SLIRP
376	for (so = tcb.so_next; so != &tcb; so = so_next) {
377	#else
378	while (1) {
379	if (so == &tcb) {
380	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
381	break;
382	}
383	#endif
384	so_next = so->so_next;
385	VBOX_SLIRP_LOCK(so->so_mutex);
386	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
387
388	/*
389	* See if we need a tcp_fasttimo
390	*/
391	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
392	time_fasttimo = curtime; /* Flag when we want a fasttimo */
393
394	/*
395	* NOFDREF can include still connecting to local-host,
396	* newly socreated() sockets etc. Don't want to select these.
397	*/
398	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
399	goto before_loop_ends;
400
401	/*
402	* Set for reading sockets which are accepting
403	*/
404	if (so->so_state & SS_FACCEPTCONN) {
405	FD_SET(so->s, readfds);
406	UPD_NFDS(so->s);
407	goto before_loop_ends;
408	}
409
410	/*
411	* Set for writing sockets which are connecting
412	*/
413	if (so->so_state & SS_ISFCONNECTING) {
414	FD_SET(so->s, writefds);
415	UPD_NFDS(so->s);
416	goto before_loop_ends;
417	}
418
419	/*
420	* Set for writing if we are connected, can send more, and
421	* we have something to send
422	*/
423	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
424	FD_SET(so->s, writefds);
425	UPD_NFDS(so->s);
426	}
427
428	/*
429	* Set for reading (and urgent data) if we are connected, can
430	* receive more, and we have room for it XXX /2 ?
431	*/
432	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
433	FD_SET(so->s, readfds);
434	FD_SET(so->s, xfds);
435	UPD_NFDS(so->s);
436	}
437	before_loop_ends:
438	/Release of global tcb mutex happens in the head of loop/
439	VBOX_SLIRP_UNLOCK(so->so_mutex);
440	VBOX_SLIRP_LOCK(pData->tcb_mutex);
441	#ifdef VBOX_WITH_SYNC_SLIRP
442	so = so_next;
443	#endif
444	}
445
446	/*
447	* UDP sockets
448	*/
449	VBOX_SLIRP_LOCK(pData->udb_mutex);
450	so = udb.so_next;
451	#ifndef VBOX_WITH_SYNC_SLIRP
452	for (so = udb.so_next; so != &udb; so = so_next) {
453	#else
454	while(1) {
455	if (so == &udb) {
456	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
457	break;
458	}
459	#endif
460	so_next = so->so_next;
461	VBOX_SLIRP_LOCK(so->so_mutex);
462	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
463
464	/*
465	* See if it's timed out
466	*/
467	if (so->so_expire) {
468	if (so->so_expire <= curtime) {
469	udp_detach(pData, so);
470	goto before_udp_loop_end;
471	} else
472	do_slowtimo = 1; /* Let socket expire */
473	}
474
475	/*
476	* When UDP packets are received from over the
477	* link, they're sendto()'d straight away, so
478	* no need for setting for writing
479	* Limit the number of packets queued by this session
480	* to 4. Note that even though we try and limit this
481	* to 4 packets, the session could have more queued
482	* if the packets needed to be fragmented
483	* (XXX <= 4 ?)
484	*/
485	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
486	FD_SET(so->s, readfds);
487	UPD_NFDS(so->s);
488	}
489	before_udp_loop_end:
490	VBOX_SLIRP_UNLOCK(so->so_mutex);
491	VBOX_SLIRP_LOCK(pData->udb_mutex);
492	#ifdef VBOX_WITH_SYNC_SLIRP
493	so = so_next;
494	#endif
495	}
496	}
497
498	/*
499	* Setup timeout to use minimum CPU usage, especially when idle
500	*/
501
502	/*
503	* First, see the timeout needed by *timo
504	*/
505	timeout.tv_sec = 0;
506	timeout.tv_usec = -1;
507	/*
508	* If a slowtimo is needed, set timeout to 500ms from the last
509	* slow timeout. If a fast timeout is needed, set timeout within
510	* 200ms of when it was requested.
511	*/
512	if (do_slowtimo) {
513	/* XXX + 10000 because some select()'s aren't that accurate */
514	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
515	if (timeout.tv_usec < 0)
516	timeout.tv_usec = 0;
517	else if (timeout.tv_usec > 510000)
518	timeout.tv_usec = 510000;
519
520	/* Can only fasttimo if we also slowtimo */
521	if (time_fasttimo) {
522	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
523	if (tmp_time < 0)
524	tmp_time = 0;
525
526	/* Choose the smallest of the 2 */
527	if (tmp_time < timeout.tv_usec)
528	timeout.tv_usec = (u_int)tmp_time;
529	}
530	}
531	*pnfds = nfds;
532	}
533
534	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
535	{
536	struct socket so, so_next;
537	int ret;
538
539	/* Update time */
540	updtime(pData);
541
542	/*
543	* See if anything has timed out
544	*/
545	if (link_up) {
546	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
547	tcp_fasttimo(pData);
548	time_fasttimo = 0;
549	}
550	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
551	ip_slowtimo(pData);
552	tcp_slowtimo(pData);
553	last_slowtimo = curtime;
554	}
555	}
556
557	/*
558	* Check sockets
559	*/
560	if (link_up) {
561	/*
562	* Check TCP sockets
563	*/
564	VBOX_SLIRP_LOCK(pData->tcb_mutex);
565	so = tcb.so_next;
566	#ifndef VBOX_WITH_SYNC_SLIRP
567	for (so = tcb.so_next; so != &tcb; so = so_next) {
568	so_next = so->so_next;
569	#else
570	while (1) {
571	if (so == &tcb) {
572	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
573	break;
574	}
575	so_next = so->so_next;
576
577	AssertRelease(so->so_mutex != NULL);
578	AssertRelease(so->so_next != NULL && so->so_prev != NULL);
579	#endif
580	VBOX_SLIRP_LOCK(so->so_mutex);
581	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
582
583	/*
584	* FD_ISSET is meaningless on these sockets
585	* (and they can crash the program)
586	*/
587	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
588	goto before_loop_ends;
589
590	/*
591	* Check for URG data
592	* This will soread as well, so no need to
593	* test for readfds below if this succeeds
594	*/
595	if (FD_ISSET(so->s, xfds))
596	sorecvoob(pData, so);
597	/*
598	* Check sockets for reading
599	*/
600	else if (FD_ISSET(so->s, readfds)) {
601	/*
602	* Check for incoming connections
603	*/
604	if (so->so_state & SS_FACCEPTCONN) {
605	tcp_connect(pData, so);
606	goto before_loop_ends;
607	} /* else */
608	ret = soread(pData, so);
609
610	/* Output it if we read something */
611	if (ret > 0)
612	tcp_output(pData, sototcpcb(so));
613	}
614
615	/*
616	* Check sockets for writing
617	*/
618	if (FD_ISSET(so->s, writefds)) {
619	/*
620	* Check for non-blocking, still-connecting sockets
621	*/
622	if (so->so_state & SS_ISFCONNECTING) {
623	/* Connected */
624	so->so_state &= ~SS_ISFCONNECTING;
625
626	/*
627	* This should be probably guarded by PROBE_CONN too. Anyway,
628	* we disable it on OS/2 because the below send call returns
629	* EFAULT which causes the opened TCP socket to close right
630	* after it has been opened and connected.
631	*/
632	#ifndef RT_OS_OS2
633	ret = send(so->s, (const char *)&ret, 0, 0);
634	if (ret < 0) {
635	/* XXXXX Must fix, zero bytes is a NOP */
636	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
637	errno == EINPROGRESS \|\| errno == ENOTCONN)
638	goto before_loop_ends;
639
640	/* else failed */
641	so->so_state = SS_NOFDREF;
642	}
643	/* else so->so_state &= ~SS_ISFCONNECTING; */
644	#endif
645
646	/*
647	* Continue tcp_input
648	*/
649	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
650	/* continue; */
651	} else
652	ret = sowrite(pData, so);
653	/*
654	* XXXXX If we wrote something (a lot), there
655	* could be a need for a window update.
656	* In the worst case, the remote will send
657	* a window probe to get things going again
658	*/
659	}
660
661	/*
662	* Probe a still-connecting, non-blocking socket
663	* to check if it's still alive
664	*/
665	#ifdef PROBE_CONN
666	if (so->so_state & SS_ISFCONNECTING) {
667	ret = recv(so->s, (char *)&ret, 0,0);
668
669	if (ret < 0) {
670	/* XXX */
671	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
672	errno == EINPROGRESS \|\| errno == ENOTCONN)
673	goto before_loop_ends;/* Still connecting, continue */
674
675	/* else failed */
676	so->so_state = SS_NOFDREF;
677
678	/* tcp_input will take care of it */
679	} else {
680	ret = send(so->s, &ret, 0,0);
681	if (ret < 0) {
682	/* XXX */
683	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
684	errno == EINPROGRESS \|\| errno == ENOTCONN)
685	goto before_loop_ends;
686	/* else failed */
687	so->so_state = SS_NOFDREF;
688	} else
689	so->so_state &= ~SS_ISFCONNECTING;
690
691	}
692	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
693	} /* SS_ISFCONNECTING */
694	#endif
695	before_loop_ends:
696	VBOX_SLIRP_UNLOCK(so->so_mutex);
697	VBOX_SLIRP_LOCK(pData->tcb_mutex);
698	#ifdef VBOX_WITH_SYNC_SLIRP
699	so = so_next;
700	#endif
701	}
702
703	/*
704	* Now UDP sockets.
705	* Incoming packets are sent straight away, they're not buffered.
706	* Incoming UDP data isn't buffered either.
707	*/
708	VBOX_SLIRP_LOCK(pData->udb_mutex);
709	so = udb.so_next;
710	#ifndef VBOX_WITH_SYNC_SLIRP
711	for (so = udb.so_next; so != &udb; so = so_next) {
712	#else
713	while(1) {
714	if (so == &udb) {
715	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
716	break;
717	}
718	#endif
719	so_next = so->so_next;
720	VBOX_SLIRP_LOCK(so->so_mutex);
721	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
722
723	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
724	sorecvfrom(pData, so);
725	}
726	VBOX_SLIRP_UNLOCK(so->so_mutex);
727	VBOX_SLIRP_LOCK(pData->udb_mutex);
728	#ifdef VBOX_WITH_SYNC_SLIRP
729	so = so_next;
730	#endif
731	}
732	}
733
734	/*
735	* See if we can start outputting
736	*/
737	#ifndef VBOX_WITH_SYNC_SLIRP
738	if (if_queued && link_up)
739	if_start(pData);
740	#else
741	#if 0
742	if (link_up) {
743	VBOX_SLIRP_LOCK(pData->if_queued_mutex);
744	if (if_queued > 0){
745	VBOX_SLIRP_UNLOCK(pData->if_queued_mutex);
746	if_start(pData);
747	}
748	else {
749	VBOX_SLIRP_UNLOCK(pData->if_queued_mutex);
750	}
751	}
752	#endif
753	#endif
754	}
755
756	#define ETH_ALEN 6
757	#define ETH_HLEN 14
758
759	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
760	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
761
762	#define ARPOP_REQUEST 1 /* ARP request */
763	#define ARPOP_REPLY 2 /* ARP reply */
764
765	struct ethhdr
766	{
767	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
768	unsigned char h_source[ETH_ALEN]; /* source ether addr */
769	unsigned short h_proto; /* packet type ID field */
770	};
771
772	struct arphdr
773	{
774	unsigned short ar_hrd; /* format of hardware address */
775	unsigned short ar_pro; /* format of protocol address */
776	unsigned char ar_hln; /* length of hardware address */
777	unsigned char ar_pln; /* length of protocol address */
778	unsigned short ar_op; /* ARP opcode (command) */
779
780	/*
781	* Ethernet looks like this : This bit is variable sized however...
782	*/
783	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
784	unsigned char ar_sip[4]; /* sender IP address */
785	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
786	unsigned char ar_tip[4]; /* target IP address */
787	};
788
789	static
790	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
791	{
792	struct ethhdr eh = (struct ethhdr )pkt;
793	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
794	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
795	struct ethhdr reh = (struct ethhdr )arp_reply;
796	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
797	int ar_op;
798	struct ex_list *ex_ptr;
799	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
800
801	ar_op = ntohs(ah->ar_op);
802	switch(ar_op) {
803	case ARPOP_REQUEST:
804	if ((htip & pData->netmask) == ntohl(special_addr.s_addr)) {
805	if ( (htip & ~pData->netmask) == CTL_DNS
806	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
807	goto arp_ok;
808	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
809	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
810	goto arp_ok;
811	}
812	return;
813	arp_ok:
814	/* XXX: make an ARP request to have the client address */
815	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
816
817	/* ARP request for alias/dns mac address */
818	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
819	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
820	reh->h_source[5] = ah->ar_tip[3];
821	reh->h_proto = htons(ETH_P_ARP);
822
823	rah->ar_hrd = htons(1);
824	rah->ar_pro = htons(ETH_P_IP);
825	rah->ar_hln = ETH_ALEN;
826	rah->ar_pln = 4;
827	rah->ar_op = htons(ARPOP_REPLY);
828	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
829	memcpy(rah->ar_sip, ah->ar_tip, 4);
830	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
831	memcpy(rah->ar_tip, ah->ar_sip, 4);
832	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
833	}
834	break;
835	default:
836	break;
837	}
838	}
839
840	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
841	{
842	struct mbuf *m;
843	int proto;
844
845	if (pkt_len < ETH_HLEN)
846	return;
847
848	proto = ntohs((uint16_t )(pkt + 12));
849	switch(proto) {
850	case ETH_P_ARP:
851	arp_input(pData, pkt, pkt_len);
852	break;
853	case ETH_P_IP:
854	/* Update time. Important if the network is very quiet, as otherwise
855	* the first outgoing connection gets an incorrect timestamp. */
856	updtime(pData);
857
858	m = m_get(pData);
859	if (!m)
860	return;
861	VBOX_SLIRP_LOCK(m->m_mutex);
862	/* Note: we add to align the IP header */
863	if (M_FREEROOM(m) < pkt_len + 2) {
864	m_inc(m, pkt_len + 2);
865	}
866	m->m_len = pkt_len + 2;
867	memcpy(m->m_data + 2, pkt, pkt_len);
868
869	m->m_data += 2 + ETH_HLEN;
870	m->m_len -= 2 + ETH_HLEN;
871
872	ip_input(pData, m);
873	VBOX_SLIRP_UNLOCK(m->m_mutex);
874	break;
875	default:
876	break;
877	}
878	}
879
880	/* output the IP packet to the ethernet device */
881	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
882	{
883	uint8_t buf[1600];
884	struct ethhdr eh = (struct ethhdr )buf;
885
886	if (ip_data_len + ETH_HLEN > sizeof(buf))
887	return;
888
889	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
890	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
891	/* XXX: not correct */
892	eh->h_source[5] = CTL_ALIAS;
893	eh->h_proto = htons(ETH_P_IP);
894	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
895	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
896	}
897
898	int slirp_redir(PNATState pData, int is_udp, int host_port,
899	struct in_addr guest_addr, int guest_port)
900	{
901	if (is_udp) {
902	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
903	htons(guest_port), 0))
904	return -1;
905	} else {
906	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
907	htons(guest_port), 0))
908	return -1;
909	}
910	return 0;
911	}
912
913	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
914	int guest_port)
915	{
916	return add_exec(&exec_list, do_pty, (char *)args,
917	addr_low_byte, htons(guest_port));
918	}
919
920	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
921	{
922	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
923	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 13733

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