slirp.c@ 13738

Last change on this file since 13738 was 13738, checked in by vboxsync, 16 years ago
removing extra if/ifndefs introduced defered socket removing, to prevent deletion of socket being in lock
Property svn:eol-style set to `native`
File size: 26.0 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	#ifdef VBOX_WITH_SYNC_SLIRP
386	VBOX_SLIRP_LOCK(so->so_mutex);
387	while (so->so_destroy == 1) {
388	VBOX_SLIRP_UNLOCK(so->so_mutex);
389	VBOX_SLIRP_LOCK_DESTROY(so->so_mutex);
390	free(so);
391	so = so_next;
392	so_next = so->so_next;
393	VBOX_SLIRP_LOCK(so->so_mutex);
394	}
395	#endif
396	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
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	goto before_loop_ends;
410
411	/*
412	* Set for reading sockets which are accepting
413	*/
414	if (so->so_state & SS_FACCEPTCONN) {
415	FD_SET(so->s, readfds);
416	UPD_NFDS(so->s);
417	goto before_loop_ends;
418	}
419
420	/*
421	* Set for writing sockets which are connecting
422	*/
423	if (so->so_state & SS_ISFCONNECTING) {
424	FD_SET(so->s, writefds);
425	UPD_NFDS(so->s);
426	goto before_loop_ends;
427	}
428
429	/*
430	* Set for writing if we are connected, can send more, and
431	* we have something to send
432	*/
433	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
434	FD_SET(so->s, writefds);
435	UPD_NFDS(so->s);
436	}
437
438	/*
439	* Set for reading (and urgent data) if we are connected, can
440	* receive more, and we have room for it XXX /2 ?
441	*/
442	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
443	FD_SET(so->s, readfds);
444	FD_SET(so->s, xfds);
445	UPD_NFDS(so->s);
446	}
447	before_loop_ends:
448	/Release of global tcb mutex happens in the head of loop/
449	VBOX_SLIRP_UNLOCK(so->so_mutex);
450	VBOX_SLIRP_LOCK(pData->tcb_mutex);
451	#ifdef VBOX_WITH_SYNC_SLIRP
452	so = so_next;
453	#endif
454	}
455
456	/*
457	* UDP sockets
458	*/
459	VBOX_SLIRP_LOCK(pData->udb_mutex);
460	so = udb.so_next;
461	#ifndef VBOX_WITH_SYNC_SLIRP
462	for (so = udb.so_next; so != &udb; so = so_next) {
463	#else
464	while(1) {
465	if (so == &udb) {
466	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
467	break;
468	}
469	#endif
470	so_next = so->so_next;
471	VBOX_SLIRP_LOCK(so->so_mutex);
472	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
473
474	/*
475	* See if it's timed out
476	*/
477	if (so->so_expire) {
478	if (so->so_expire <= curtime) {
479	udp_detach(pData, so);
480	goto before_udp_loop_end;
481	} else
482	do_slowtimo = 1; /* Let socket expire */
483	}
484
485	/*
486	* When UDP packets are received from over the
487	* link, they're sendto()'d straight away, so
488	* no need for setting for writing
489	* Limit the number of packets queued by this session
490	* to 4. Note that even though we try and limit this
491	* to 4 packets, the session could have more queued
492	* if the packets needed to be fragmented
493	* (XXX <= 4 ?)
494	*/
495	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
496	FD_SET(so->s, readfds);
497	UPD_NFDS(so->s);
498	}
499	before_udp_loop_end:
500	VBOX_SLIRP_UNLOCK(so->so_mutex);
501	VBOX_SLIRP_LOCK(pData->udb_mutex);
502	#ifdef VBOX_WITH_SYNC_SLIRP
503	so = so_next;
504	#endif
505	}
506	}
507
508	/*
509	* Setup timeout to use minimum CPU usage, especially when idle
510	*/
511
512	/*
513	* First, see the timeout needed by *timo
514	*/
515	timeout.tv_sec = 0;
516	timeout.tv_usec = -1;
517	/*
518	* If a slowtimo is needed, set timeout to 500ms from the last
519	* slow timeout. If a fast timeout is needed, set timeout within
520	* 200ms of when it was requested.
521	*/
522	if (do_slowtimo) {
523	/* XXX + 10000 because some select()'s aren't that accurate */
524	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
525	if (timeout.tv_usec < 0)
526	timeout.tv_usec = 0;
527	else if (timeout.tv_usec > 510000)
528	timeout.tv_usec = 510000;
529
530	/* Can only fasttimo if we also slowtimo */
531	if (time_fasttimo) {
532	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
533	if (tmp_time < 0)
534	tmp_time = 0;
535
536	/* Choose the smallest of the 2 */
537	if (tmp_time < timeout.tv_usec)
538	timeout.tv_usec = (u_int)tmp_time;
539	}
540	}
541	*pnfds = nfds;
542	}
543
544	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
545	{
546	struct socket so, so_next;
547	int ret;
548
549	/* Update time */
550	updtime(pData);
551
552	/*
553	* See if anything has timed out
554	*/
555	if (link_up) {
556	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
557	tcp_fasttimo(pData);
558	time_fasttimo = 0;
559	}
560	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
561	ip_slowtimo(pData);
562	tcp_slowtimo(pData);
563	last_slowtimo = curtime;
564	}
565	}
566
567	/*
568	* Check sockets
569	*/
570	if (link_up) {
571	/*
572	* Check TCP sockets
573	*/
574	VBOX_SLIRP_LOCK(pData->tcb_mutex);
575	so = tcb.so_next;
576	#ifndef VBOX_WITH_SYNC_SLIRP
577	for (so = tcb.so_next; so != &tcb; so = so_next) {
578	#else
579	while (1) {
580	if (so == &tcb) {
581	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
582	break;
583	}
584	#endif
585	so_next = so->so_next;
586
587
588	#ifdef VBOX_WITH_SYNC_SLIRP
589	if (so->so_destroy == 1) {
590	VBOX_SLIRP_LOCK_DESTROY(so->so_mutex);
591	free(so);
592	so = tcb.so_next;
593	so_next = so->so_next;
594	}
595	VBOX_SLIRP_LOCK(so->so_mutex);
596	#endif
597	VBOX_SLIRP_UNLOCK(pData->tcb_mutex);
598
599	/*
600	* FD_ISSET is meaningless on these sockets
601	* (and they can crash the program)
602	*/
603	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
604	goto before_loop_ends;
605
606	/*
607	* Check for URG data
608	* This will soread as well, so no need to
609	* test for readfds below if this succeeds
610	*/
611	if (FD_ISSET(so->s, xfds))
612	sorecvoob(pData, so);
613	/*
614	* Check sockets for reading
615	*/
616	else if (FD_ISSET(so->s, readfds)) {
617	/*
618	* Check for incoming connections
619	*/
620	if (so->so_state & SS_FACCEPTCONN) {
621	tcp_connect(pData, so);
622	goto before_loop_ends;
623	} /* else */
624	ret = soread(pData, so);
625
626	/* Output it if we read something */
627	if (ret > 0)
628	tcp_output(pData, sototcpcb(so));
629	}
630
631	/*
632	* Check sockets for writing
633	*/
634	if (FD_ISSET(so->s, writefds)) {
635	/*
636	* Check for non-blocking, still-connecting sockets
637	*/
638	if (so->so_state & SS_ISFCONNECTING) {
639	/* Connected */
640	so->so_state &= ~SS_ISFCONNECTING;
641
642	/*
643	* This should be probably guarded by PROBE_CONN too. Anyway,
644	* we disable it on OS/2 because the below send call returns
645	* EFAULT which causes the opened TCP socket to close right
646	* after it has been opened and connected.
647	*/
648	#ifndef RT_OS_OS2
649	ret = send(so->s, (const char *)&ret, 0, 0);
650	if (ret < 0) {
651	/* XXXXX Must fix, zero bytes is a NOP */
652	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
653	errno == EINPROGRESS \|\| errno == ENOTCONN)
654	goto before_loop_ends;
655
656	/* else failed */
657	so->so_state = SS_NOFDREF;
658	}
659	/* else so->so_state &= ~SS_ISFCONNECTING; */
660	#endif
661
662	/*
663	* Continue tcp_input
664	*/
665	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
666	/* continue; */
667	} else
668	ret = sowrite(pData, so);
669	/*
670	* XXXXX If we wrote something (a lot), there
671	* could be a need for a window update.
672	* In the worst case, the remote will send
673	* a window probe to get things going again
674	*/
675	}
676
677	/*
678	* Probe a still-connecting, non-blocking socket
679	* to check if it's still alive
680	*/
681	#ifdef PROBE_CONN
682	if (so->so_state & SS_ISFCONNECTING) {
683	ret = recv(so->s, (char *)&ret, 0,0);
684
685	if (ret < 0) {
686	/* XXX */
687	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
688	errno == EINPROGRESS \|\| errno == ENOTCONN)
689	goto before_loop_ends;/* Still connecting, continue */
690
691	/* else failed */
692	so->so_state = SS_NOFDREF;
693
694	/* tcp_input will take care of it */
695	} else {
696	ret = send(so->s, &ret, 0,0);
697	if (ret < 0) {
698	/* XXX */
699	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
700	errno == EINPROGRESS \|\| errno == ENOTCONN)
701	goto before_loop_ends;
702	/* else failed */
703	so->so_state = SS_NOFDREF;
704	} else
705	so->so_state &= ~SS_ISFCONNECTING;
706
707	}
708	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
709	} /* SS_ISFCONNECTING */
710	#endif
711	before_loop_ends:
712	VBOX_SLIRP_UNLOCK(so->so_mutex);
713	VBOX_SLIRP_LOCK(pData->tcb_mutex);
714	#ifdef VBOX_WITH_SYNC_SLIRP
715	so = so_next;
716	#endif
717	}
718
719	/*
720	* Now UDP sockets.
721	* Incoming packets are sent straight away, they're not buffered.
722	* Incoming UDP data isn't buffered either.
723	*/
724	VBOX_SLIRP_LOCK(pData->udb_mutex);
725	so = udb.so_next;
726	#ifndef VBOX_WITH_SYNC_SLIRP
727	for (so = udb.so_next; so != &udb; so = so_next) {
728	#else
729	while(1) {
730	if (so == &udb) {
731	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
732	break;
733	}
734	#endif
735	so_next = so->so_next;
736	VBOX_SLIRP_LOCK(so->so_mutex);
737	VBOX_SLIRP_UNLOCK(pData->udb_mutex);
738
739	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
740	sorecvfrom(pData, so);
741	}
742	VBOX_SLIRP_UNLOCK(so->so_mutex);
743	VBOX_SLIRP_LOCK(pData->udb_mutex);
744	#ifdef VBOX_WITH_SYNC_SLIRP
745	so = so_next;
746	#endif
747	}
748	}
749
750	/*
751	* See if we can start outputting
752	*/
753	#ifndef VBOX_WITH_SYNC_SLIRP
754	if (if_queued && link_up)
755	if_start(pData);
756	#else
757	#if 0
758	if (link_up) {
759	VBOX_SLIRP_LOCK(pData->if_queued_mutex);
760	if (if_queued > 0){
761	VBOX_SLIRP_UNLOCK(pData->if_queued_mutex);
762	if_start(pData);
763	}
764	else {
765	VBOX_SLIRP_UNLOCK(pData->if_queued_mutex);
766	}
767	}
768	#endif
769	#endif
770	}
771
772	#define ETH_ALEN 6
773	#define ETH_HLEN 14
774
775	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
776	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
777
778	#define ARPOP_REQUEST 1 /* ARP request */
779	#define ARPOP_REPLY 2 /* ARP reply */
780
781	struct ethhdr
782	{
783	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
784	unsigned char h_source[ETH_ALEN]; /* source ether addr */
785	unsigned short h_proto; /* packet type ID field */
786	};
787
788	struct arphdr
789	{
790	unsigned short ar_hrd; /* format of hardware address */
791	unsigned short ar_pro; /* format of protocol address */
792	unsigned char ar_hln; /* length of hardware address */
793	unsigned char ar_pln; /* length of protocol address */
794	unsigned short ar_op; /* ARP opcode (command) */
795
796	/*
797	* Ethernet looks like this : This bit is variable sized however...
798	*/
799	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
800	unsigned char ar_sip[4]; /* sender IP address */
801	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
802	unsigned char ar_tip[4]; /* target IP address */
803	};
804
805	static
806	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
807	{
808	struct ethhdr eh = (struct ethhdr )pkt;
809	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
810	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
811	struct ethhdr reh = (struct ethhdr )arp_reply;
812	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
813	int ar_op;
814	struct ex_list *ex_ptr;
815	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
816
817	ar_op = ntohs(ah->ar_op);
818	switch(ar_op) {
819	case ARPOP_REQUEST:
820	if ((htip & pData->netmask) == ntohl(special_addr.s_addr)) {
821	if ( (htip & ~pData->netmask) == CTL_DNS
822	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
823	goto arp_ok;
824	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
825	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
826	goto arp_ok;
827	}
828	return;
829	arp_ok:
830	/* XXX: make an ARP request to have the client address */
831	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
832
833	/* ARP request for alias/dns mac address */
834	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
835	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
836	reh->h_source[5] = ah->ar_tip[3];
837	reh->h_proto = htons(ETH_P_ARP);
838
839	rah->ar_hrd = htons(1);
840	rah->ar_pro = htons(ETH_P_IP);
841	rah->ar_hln = ETH_ALEN;
842	rah->ar_pln = 4;
843	rah->ar_op = htons(ARPOP_REPLY);
844	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
845	memcpy(rah->ar_sip, ah->ar_tip, 4);
846	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
847	memcpy(rah->ar_tip, ah->ar_sip, 4);
848	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
849	}
850	break;
851	default:
852	break;
853	}
854	}
855
856	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
857	{
858	struct mbuf *m;
859	int proto;
860
861	if (pkt_len < ETH_HLEN)
862	return;
863
864	proto = ntohs((uint16_t )(pkt + 12));
865	switch(proto) {
866	case ETH_P_ARP:
867	arp_input(pData, pkt, pkt_len);
868	break;
869	case ETH_P_IP:
870	/* Update time. Important if the network is very quiet, as otherwise
871	* the first outgoing connection gets an incorrect timestamp. */
872	updtime(pData);
873
874	m = m_get(pData);
875	if (!m)
876	return;
877	VBOX_SLIRP_LOCK(m->m_mutex);
878	/* Note: we add to align the IP header */
879	if (M_FREEROOM(m) < pkt_len + 2) {
880	m_inc(m, pkt_len + 2);
881	}
882	m->m_len = pkt_len + 2;
883	memcpy(m->m_data + 2, pkt, pkt_len);
884
885	m->m_data += 2 + ETH_HLEN;
886	m->m_len -= 2 + ETH_HLEN;
887
888	ip_input(pData, m);
889	VBOX_SLIRP_UNLOCK(m->m_mutex);
890	break;
891	default:
892	break;
893	}
894	}
895
896	/* output the IP packet to the ethernet device */
897	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
898	{
899	uint8_t buf[1600];
900	struct ethhdr eh = (struct ethhdr )buf;
901
902	if (ip_data_len + ETH_HLEN > sizeof(buf))
903	return;
904
905	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
906	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
907	/* XXX: not correct */
908	eh->h_source[5] = CTL_ALIAS;
909	eh->h_proto = htons(ETH_P_IP);
910	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
911	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
912	}
913
914	int slirp_redir(PNATState pData, int is_udp, int host_port,
915	struct in_addr guest_addr, int guest_port)
916	{
917	if (is_udp) {
918	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
919	htons(guest_port), 0))
920	return -1;
921	} else {
922	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
923	htons(guest_port), 0))
924	return -1;
925	}
926	return 0;
927	}
928
929	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
930	int guest_port)
931	{
932	return add_exec(&exec_list, do_pty, (char *)args,
933	addr_low_byte, htons(guest_port));
934	}
935
936	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
937	{
938	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
939	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 13738

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