slirp.c@ 16448

Last change on this file since 16448 was 16448, checked in by vboxsync, 16 years ago
NAT:MT improvements
Property svn:eol-style set to `native`
File size: 39.7 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 <VBox/pdmdrv.h>
8	#include <iprt/assert.h>
9
10	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
11
12	# define DO_ENGAGE_EVENT1(so, fdset, label) \
13	do { \
14	FD_SET((so)->s, (fdset)); \
15	UPD_NFDS((so)->s); \
16	} while(0)
17
18
19	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
20	do { \
21	FD_SET((so)->s, (fdset1)); \
22	FD_SET((so)->s, (fdset2)); \
23	UPD_NFDS((so)->s); \
24	} while(0)
25
26	# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
27
28	# define DO_CHECK_FD_SET(so, events, fdset) (FD_ISSET((so)->s, (fdset)))
29
30	# define DO_WIN_CHECK_FD_SET(so, events, fdset ) 0 /* specific for Windows Winsock API */
31
32	# ifndef RT_OS_WINDOWS
33	# define ICMP_ENGAGE_EVENT(so, fdset) \
34	do { \
35	if (pData->icmp_socket.s != -1) \
36	DO_ENGAGE_EVENT1((so), (fdset), ICMP); \
37	} while (0)
38	# else /* !RT_OS_WINDOWS */
39	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while(0)
40	#endif /* RT_OS_WINDOWS */
41
42	#else /* defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS) */
43
44	/*
45	* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
46	* So no call to WSAEventSelect necessary.
47	*/
48	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while(0)
49
50	# define DO_ENGAGE_EVENT1(so, fdset1, label) \
51	do { \
52	rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
53	if (rc == SOCKET_ERROR) \
54	{ \
55	/* This should not happen */ \
56	error = WSAGetLastError(); \
57	LogRel(("WSAEventSelector (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
58	error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
59	} \
60	} while(0); \
61	CONTINUE(label)
62
63	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
64	DO_ENGAGE_EVENT1((so), (fdset1), label)
65
66	# define DO_POLL_EVENTS(rc, error, so, events, label) \
67	(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
68	if ((rc) == SOCKET_ERROR) \
69	{ \
70	(error) = WSAGetLastError(); \
71	LogRel(("WSAEnumNetworkEvents " #label " error %d\n", (error))); \
72	CONTINUE(label); \
73	}
74
75	# define acceptds_win FD_ACCEPT
76	# define acceptds_win_bit FD_ACCEPT_BIT
77
78	# define readfds_win FD_READ
79	# define readfds_win_bit FD_READ_BIT
80
81	# define writefds_win FD_WRITE
82	# define writefds_win_bit FD_WRITE_BIT
83
84	# define xfds_win FD_OOB
85	# define xfds_win_bit FD_OOB_BIT
86
87	# define DO_CHECK_FD_SET(so, events, fdset) \
88	(((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
89
90	# define DO_WIN_CHECK_FD_SET(so, events, fdset ) DO_CHECK_FD_SET((so), (events), fdset)
91
92	#endif /* defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS) */
93
94	#define TCP_ENGAGE_EVENT1(so, fdset) \
95	DO_ENGAGE_EVENT1((so), (fdset), tcp)
96
97	#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
98	DO_ENGAGE_EVENT2((so), (fdset1), (fdset2), tcp)
99
100	#define UDP_ENGAGE_EVENT(so, fdset) \
101	DO_ENGAGE_EVENT1((so), (fdset), udp)
102
103	#define POLL_TCP_EVENTS(rc, error, so, events) \
104	DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
105
106	#define POLL_UDP_EVENTS(rc, error, so, events) \
107	DO_POLL_EVENTS((rc), (error), (so), (events), udp)
108
109	#define CHECK_FD_SET(so, events, set) \
110	(DO_CHECK_FD_SET((so), (events), set))
111
112	#define WIN_CHECK_FD_SET(so, events, set) \
113	(DO_WIN_CHECK_FD_SET((so), (events), set))
114
115	/*
116	* Loging macros
117	*/
118	#if VBOX_WITH_DEBUG_NAT_SOCKETS
119	# if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
120	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
121	do { \
122	LogRel((" " #proto "%R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
123	} while (0)
124	# else
125	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
126	do { \
127	LogRel((" " #proto " %R[natsock] %s %s %s\n", (so), FD_ISSET((so)->s, (r_fdset))?"READ":"",\
128	FD_ISSET((so)->s, (w_fdset))?"WRITE":"", FD_ISSET((so)->s, (x_fdset))?"OOB":"")); \
129	} while (0)
130	# endif /* VBOX_WITH_DEBUG_NAT_SOCKETS */
131	#else
132	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
133	#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
134
135	#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) DO_LOG_NAT_SOCK((so), proto, (winevent), (r_fdset), (w_fdset), (x_fdset))
136
137	static const uint8_t special_ethaddr[6] =
138	{
139	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
140	};
141
142	#ifdef RT_OS_WINDOWS
143
144	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
145	struct in_addr *pdns_addr,
146	const char **ppszDomain)
147	{
148	int rc = 0;
149	FIXED_INFO *FixedInfo = NULL;
150	ULONG BufLen;
151	DWORD ret;
152	IP_ADDR_STRING *pIPAddr;
153	struct in_addr tmp_addr;
154
155	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
156	BufLen = sizeof(FIXED_INFO);
157
158	/** @todo: this API returns all DNS servers, no matter whether the
159	* corresponding network adapter is disabled or not. Maybe replace
160	* this by GetAdapterAddresses(), which is XP/Vista only though. */
161	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen))
162	{
163	if (FixedInfo)
164	{
165	GlobalFree(FixedInfo);
166	FixedInfo = NULL;
167	}
168	FixedInfo = GlobalAlloc(GPTR, BufLen);
169	}
170
171	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS)
172	{
173	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
174	if (FixedInfo)
175	{
176	GlobalFree(FixedInfo);
177	FixedInfo = NULL;
178	}
179	rc = -1;
180	goto get_dns_prefix;
181	}
182
183	#ifndef VBOX_WITH_MULTI_DNS
184	pIPAddr = &(FixedInfo->DnsServerList);
185	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
186	Log(("nat: DNS Servers:\n"));
187	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
188	LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
189	*pdns_addr = tmp_addr;
190
191	pIPAddr = FixedInfo -> DnsServerList.Next;
192	while (pIPAddr)
193	{
194	if (fVerbose)
195	LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
196	pIPAddr = pIPAddr ->Next;
197	}
198	#else
199	/localhost mask /
200	for (pIPAddr = &FixedInfo->DnsServerList; pIPAddr != NULL; pIPAddr = pIPAddr->Next)
201	{
202	struct dns_entry *da;
203	if(!inet_aton(pIPAddr->IpAddress.String, &tmp_addr))
204	continue;
205	da = RTMemAllocZ(sizeof (struct dns_entry));
206	if (da == NULL)
207	{
208	LogRel(("can't alloc memory for DNS entry\n"));
209	return -1;
210	}
211	/check /
212	if ((da->de_addr.s_addr & htonl(IN_CLASSA_NET)) == ntohl(INADDR_LOOPBACK & IN_CLASSA_NET)) {
213	da->de_addr.s_addr = htonl(ntohl(special_addr.s_addr) \| CTL_ALIAS);
214	}
215	LIST_INSERT_HEAD(&pData->dns_list_head, da, de_list);
216	}
217	#endif
218	if (FixedInfo)
219	{
220	GlobalFree(FixedInfo);
221	FixedInfo = NULL;
222	}
223
224	get_dns_prefix:
225	if (ppszDomain)
226	{
227	OSVERSIONINFO ver;
228	char szDnsDomain[256];
229	DWORD dwSize = sizeof(szDnsDomain);
230
231	*ppszDomain = NULL;
232	GetVersionEx(&ver);
233	if (ver.dwMajorVersion >= 5)
234	{
235	/* GetComputerNameEx exists in Windows versions starting with 2000. */
236	if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
237	{
238	if (szDnsDomain[0])
239	{
240	/* Just non-empty strings are valid. */
241	*ppszDomain = RTStrDup(szDnsDomain);
242	if (pData->fPassDomain)
243	{
244	if (fVerbose)
245	LogRel(("NAT: passing domain name %s\n", szDnsDomain));
246	}
247	else
248	Log(("nat: ignoring domain %s\n", szDnsDomain));
249	}
250	}
251	else
252	Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
253	}
254	}
255	return rc;
256	}
257
258	#else
259
260	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
261	struct in_addr *pdns_addr,
262	const char **ppszDomain)
263	{
264	char buff[512];
265	char buff2[256];
266	FILE *f;
267	int found = 0;
268	struct in_addr tmp_addr;
269
270	#ifdef RT_OS_OS2
271	/* Try various locations. */
272	char *etc = getenv("ETC");
273	f = NULL;
274	if (etc)
275	{
276	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
277	f = fopen(buff, "rt");
278	}
279	if (!f)
280	{
281	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
282	f = fopen(buff, "rt");
283	}
284	if (!f)
285	{
286	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
287	f = fopen(buff, "rt");
288	}
289	#else
290	f = fopen("/etc/resolv.conf", "r");
291	#endif
292	if (!f)
293	return -1;
294
295	if (ppszDomain)
296	*ppszDomain = NULL;
297	Log(("nat: DNS Servers:\n"));
298	while (fgets(buff, 512, f) != NULL)
299	{
300	#ifdef VBOX_WITH_MULTI_DNS
301	struct dns_entry *da = NULL;
302	#endif
303	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1)
304	{
305	if (!inet_aton(buff2, &tmp_addr))
306	continue;
307	#ifndef VBOX_WITH_MULTI_DNS
308	/* If it's the first one, set it to dns_addr */
309	if (!found)
310	{
311	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
312	LogRel(("NAT: DNS address: %s\n", buff2));
313	*pdns_addr = tmp_addr;
314	}
315	else
316	{
317	if (fVerbose)
318	LogRel(("NAT: ignored DNS address: %s\n", buff2));
319	}
320	#else
321	/localhost mask /
322	da = RTMemAllocZ(sizeof (struct dns_entry));
323	if (da == NULL)
324	{
325	LogRel(("can't alloc memory for DNS entry\n"));
326	return -1;
327	}
328	/check /
329	da->de_addr.s_addr = tmp_addr.s_addr;
330	if ((da->de_addr.s_addr & htonl(IN_CLASSA_NET)) == ntohl(INADDR_LOOPBACK & IN_CLASSA_NET)) {
331	da->de_addr.s_addr = htonl(ntohl(special_addr.s_addr) \| CTL_ALIAS);
332	}
333	LIST_INSERT_HEAD(&pData->dns_list_head, da, de_list);
334	#endif
335	found++;
336	}
337	if ( ppszDomain
338	&& (!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6)))
339	{
340	/* Domain name/search list present. Pick first entry */
341	if (*ppszDomain == NULL)
342	{
343	char *tok;
344	char *saveptr;
345	tok = strtok_r(&buff[6], " \t\n", &saveptr);
346	if (tok)
347	{
348	*ppszDomain = RTStrDup(tok);
349	if (pData->fPassDomain)
350	{
351	if (fVerbose)
352	LogRel(("NAT: passing domain name %s\n", tok));
353	}
354	else
355	Log(("nat: ignoring domain %s\n", tok));
356	}
357	}
358	}
359	}
360	fclose(f);
361	if (!found)
362	return -1;
363	return 0;
364	}
365
366	#endif
367
368	int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
369	{
370	return get_dns_addr_domain(pData, false, pdns_addr, NULL);
371	}
372
373	int slirp_init(PNATState ppData, const char pszNetAddr, uint32_t u32Netmask,
374	bool fPassDomain, const char *pszTFTPPrefix,
375	const char pszBootFile, void pvUser)
376	{
377	int fNATfailed = 0;
378	int rc;
379	PNATState pData = RTMemAlloc(sizeof(NATState));
380	*ppData = pData;
381	if (!pData)
382	return VERR_NO_MEMORY;
383	if (u32Netmask & 0x1f)
384	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
385	return VERR_INVALID_PARAMETER;
386	memset(pData, '\0', sizeof(NATState));
387	pData->fPassDomain = fPassDomain;
388	pData->pvUser = pvUser;
389	tftp_prefix = pszTFTPPrefix;
390	bootp_filename = pszBootFile;
391	pData->netmask = u32Netmask;
392
393	#ifdef RT_OS_WINDOWS
394	{
395	WSADATA Data;
396	WSAStartup(MAKEWORD(2,0), &Data);
397	}
398	# if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
399	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
400	# endif
401	#endif
402	#ifdef VBOX_WITH_SLIRP_MT
403	QSOCKET_LOCK_CREATE(tcb);
404	QSOCKET_LOCK_CREATE(udb);
405	rc = RTReqCreateQueue(&pData->pReqQueue);
406	AssertReleaseRC(rc);
407	#endif
408
409	link_up = 1;
410
411	debug_init();
412	if_init(pData);
413	ip_init(pData);
414	icmp_init(pData);
415
416	/* Initialise mbufs after setting the MTU */
417	m_init(pData);
418
419	inet_aton(pszNetAddr, &special_addr);
420	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
421	/* @todo: add ability to configure this staff */
422	pData->tftp_server.s_addr = htonl(ntohl(special_addr.s_addr) \| CTL_TFTP);
423
424	/* set default addresses */
425	inet_aton("127.0.0.1", &loopback_addr);
426	#ifndef VBOX_WITH_MULTI_DNS
427	inet_aton("127.0.0.1", &dns_addr);
428
429	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
430	#else
431	LIST_INIT(&pData->dns_list_head);
432	if (get_dns_addr_domain(pData, true, NULL, &pData->pszDomain) < 0)
433	#endif
434	fNATfailed = 1;
435
436	getouraddr(pData);
437	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
438	}
439
440	/**
441	* Statistics counters.
442	*/
443	void slirp_register_timers(PNATState pData, PPDMDRVINS pDrvIns)
444	{
445	#ifdef VBOX_WITH_STATISTICS
446	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFill, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
447	STAMUNIT_TICKS_PER_CALL, "Profiling slirp fills", "/Drivers/NAT%d/Fill", pDrvIns->iInstance);
448	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPoll, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
449	STAMUNIT_TICKS_PER_CALL, "Profiling slirp polls", "/Drivers/NAT%d/Poll", pDrvIns->iInstance);
450	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFastTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
451	STAMUNIT_TICKS_PER_CALL, "Profiling slirp fast timer", "/Drivers/NAT%d/TimerFast", pDrvIns->iInstance);
452	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatSlowTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
453	STAMUNIT_TICKS_PER_CALL, "Profiling slirp slow timer", "/Drivers/NAT%d/TimerSlow", pDrvIns->iInstance);
454	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
455	STAMUNIT_COUNT, "TCP sockets", "/Drivers/NAT%d/SockTCP", pDrvIns->iInstance);
456	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
457	STAMUNIT_COUNT, "TCP sockets active", "/Drivers/NAT%d/SockTCPHot", pDrvIns->iInstance);
458	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
459	STAMUNIT_COUNT, "UDP sockets", "/Drivers/NAT%d/SockUDP", pDrvIns->iInstance);
460	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
461	STAMUNIT_COUNT, "UDP sockets active", "/Drivers/NAT%d/SockUDPHot", pDrvIns->iInstance);
462	#endif /* VBOX_WITH_STATISTICS */
463	}
464
465	/**
466	* Marks the link as up, making it possible to establish new connections.
467	*/
468	void slirp_link_up(PNATState pData)
469	{
470	link_up = 1;
471	}
472
473	/**
474	* Marks the link as down and cleans up the current connections.
475	*/
476	void slirp_link_down(PNATState pData)
477	{
478	struct socket *so;
479
480	while ((so = tcb.so_next) != &tcb)
481	{
482	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
483	sofree(pData, so);
484	else
485	tcp_drop(pData, sototcpcb(so), 0);
486	}
487
488	while ((so = udb.so_next) != &udb)
489	udp_detach(pData, so);
490
491	link_up = 0;
492	}
493
494	/**
495	* Terminates the slirp component.
496	*/
497	void slirp_term(PNATState pData)
498	{
499	#ifdef VBOX_WITH_MULTI_DNS
500	struct dns_entry *de = NULL;
501	#endif
502	if (pData->pszDomain)
503	RTStrFree((char )(void )pData->pszDomain);
504
505	#ifdef RT_OS_WINDOWS
506	pData->pfIcmpCloseHandle(pData->icmp_socket.sh);
507	FreeLibrary(pData->hmIcmpLibrary);
508	RTMemFree(pData->pvIcmpBuffer);
509	# else
510	closesocket(pData->icmp_socket.s);
511	#endif
512
513	slirp_link_down(pData);
514	#ifdef VBOX_WITH_MULTI_DNS
515	while(!LIST_EMPTY(&pData->dns_list_head)) {
516	de = LIST_FIRST(&pData->dns_list_head);
517	LIST_REMOVE(de, de_list);
518	RTMemFree(de);
519	}
520	#endif
521	#ifdef RT_OS_WINDOWS
522	WSACleanup();
523	#endif
524	#ifdef LOG_ENABLED
525	Log(("\n"
526	"NAT statistics\n"
527	"--------------\n"
528	"\n"));
529	ipstats(pData);
530	tcpstats(pData);
531	udpstats(pData);
532	icmpstats(pData);
533	mbufstats(pData);
534	sockstats(pData);
535	Log(("\n"
536	"\n"
537	"\n"));
538	#endif
539	RTMemFree(pData);
540	}
541
542
543	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
544	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
545	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
546
547	/*
548	* curtime kept to an accuracy of 1ms
549	*/
550	#ifdef RT_OS_WINDOWS
551	static void updtime(PNATState pData)
552	{
553	struct _timeb tb;
554
555	_ftime(&tb);
556	curtime = (u_int)tb.time * (u_int)1000;
557	curtime += (u_int)tb.millitm;
558	}
559	#else
560	static void updtime(PNATState pData)
561	{
562	gettimeofday(&tt, 0);
563
564	curtime = (u_int)tt.tv_sec * (u_int)1000;
565	curtime += (u_int)tt.tv_usec / (u_int)1000;
566
567	if ((tt.tv_usec % 1000) >= 500)
568	curtime++;
569	}
570	#endif
571
572	void slirp_select_fill(PNATState pData, int *pnfds,
573	fd_set readfds, fd_set writefds, fd_set *xfds)
574	{
575	struct socket so, so_next;
576	int nfds;
577	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
578	int rc;
579	int error;
580	#endif
581	int i;
582
583	STAM_PROFILE_START(&pData->StatFill, a);
584
585	nfds = *pnfds;
586
587	/*
588	* First, TCP sockets
589	*/
590	do_slowtimo = 0;
591	if (link_up)
592	{
593	/*
594	* *_slowtimo needs calling if there are IP fragments
595	* in the fragment queue, or there are TCP connections active
596	*/
597	/* XXX:
598	* triggering of fragment expiration should be the same but use new macroses
599	*/
600	do_slowtimo = (tcb.so_next != &tcb);
601	if (!do_slowtimo)
602	{
603	for (i = 0; i < IPREASS_NHASH; i++)
604	{
605	if (!TAILQ_EMPTY(&ipq[i]))
606	{
607	do_slowtimo = 1;
608	break;
609	}
610	}
611	}
612	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
613
614	STAM_COUNTER_RESET(&pData->StatTCP);
615	STAM_COUNTER_RESET(&pData->StatTCPHot);
616
617	QSOCKET_FOREACH(so, so_next, tcp)
618	/* { */
619	STAM_COUNTER_INC(&pData->StatTCP);
620
621	/*
622	* See if we need a tcp_fasttimo
623	*/
624	if ( time_fasttimo == 0
625	&& so->so_tcpcb != NULL
626	&& so->so_tcpcb->t_flags & TF_DELACK)
627	time_fasttimo = curtime; /* Flag when we want a fasttimo */
628
629	/*
630	* NOFDREF can include still connecting to local-host,
631	* newly socreated() sockets etc. Don't want to select these.
632	*/
633	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
634	CONTINUE(tcp);
635
636	/*
637	* Set for reading sockets which are accepting
638	*/
639	if (so->so_state & SS_FACCEPTCONN)
640	{
641	STAM_COUNTER_INC(&pData->StatTCPHot);
642	TCP_ENGAGE_EVENT1(so, readfds);
643	CONTINUE(tcp);
644	}
645
646	/*
647	* Set for writing sockets which are connecting
648	*/
649	if (so->so_state & SS_ISFCONNECTING)
650	{
651	Log2(("connecting %R[natsock] engaged\n",so));
652	STAM_COUNTER_INC(&pData->StatTCPHot);
653	TCP_ENGAGE_EVENT1(so, writefds);
654	}
655
656	/*
657	* Set for writing if we are connected, can send more, and
658	* we have something to send
659	*/
660	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc)
661	{
662	STAM_COUNTER_INC(&pData->StatTCPHot);
663	TCP_ENGAGE_EVENT1(so, writefds);
664	}
665
666	/*
667	* Set for reading (and urgent data) if we are connected, can
668	* receive more, and we have room for it XXX /2 ?
669	*/
670	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2)))
671	{
672	STAM_COUNTER_INC(&pData->StatTCPHot);
673	TCP_ENGAGE_EVENT2(so, readfds, xfds);
674	}
675	LOOP_LABEL(tcp, so, so_next);
676	}
677
678	/*
679	* UDP sockets
680	*/
681	STAM_COUNTER_RESET(&pData->StatUDP);
682	STAM_COUNTER_RESET(&pData->StatUDPHot);
683
684	QSOCKET_FOREACH(so, so_next, udp)
685	/* { */
686
687	STAM_COUNTER_INC(&pData->StatUDP);
688
689	/*
690	* See if it's timed out
691	*/
692	if (so->so_expire)
693	{
694	if (so->so_expire <= curtime)
695	{
696	#ifdef VBOX_WITH_SLIRP_MT
697	/* we need so_next for continue our cycle*/
698	so_next = so->so_next;
699	#endif
700	UDP_DETACH(pData, so, so_next);
701	CONTINUE_NO_UNLOCK(udp);
702	}
703	else
704	do_slowtimo = 1; /* Let socket expire */
705	}
706
707	/*
708	* When UDP packets are received from over the link, they're
709	* sendto()'d straight away, so no need for setting for writing
710	* Limit the number of packets queued by this session to 4.
711	* Note that even though we try and limit this to 4 packets,
712	* the session could have more queued if the packets needed
713	* to be fragmented.
714	*
715	* (XXX <= 4 ?)
716	*/
717	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
718	{
719	STAM_COUNTER_INC(&pData->StatUDPHot);
720	UDP_ENGAGE_EVENT(so, readfds);
721	}
722	LOOP_LABEL(udp, so, so_next);
723	}
724
725	}
726
727	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
728	*pnfds = nfds;
729	#else
730	*pnfds = VBOX_EVENT_COUNT;
731	#endif
732
733	STAM_PROFILE_STOP(&pData->StatFill, a);
734	}
735
736	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
737	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
738	#else
739	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
740	#endif
741	{
742	struct socket so, so_next;
743	int ret;
744	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
745	WSANETWORKEVENTS NetworkEvents;
746	int rc;
747	int error;
748	#endif
749
750	STAM_PROFILE_START(&pData->StatPoll, a);
751
752	/* Update time */
753	updtime(pData);
754
755	/*
756	* See if anything has timed out
757	*/
758	if (link_up)
759	{
760	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
761	{
762	STAM_PROFILE_START(&pData->StatFastTimer, a);
763	tcp_fasttimo(pData);
764	time_fasttimo = 0;
765	STAM_PROFILE_STOP(&pData->StatFastTimer, a);
766	}
767	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
768	{
769	STAM_PROFILE_START(&pData->StatSlowTimer, a);
770	ip_slowtimo(pData);
771	tcp_slowtimo(pData);
772	last_slowtimo = curtime;
773	STAM_PROFILE_STOP(&pData->StatSlowTimer, a);
774	}
775	}
776	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
777	if (fTimeout)
778	return; /* only timer update */
779	#endif
780
781	/*
782	* Check sockets
783	*/
784	if (link_up)
785	{
786	#if defined(RT_OS_WINDOWS)
787	/*XXX: before renaming please make see define
788	* fIcmp in slirp_state.h
789	*/
790	if (fIcmp)
791	sorecvfrom(pData, &pData->icmp_socket);
792	#else
793	if (pData->icmp_socket.s != -1 && FD_ISSET(pData->icmp_socket.s, readfds))
794	sorecvfrom(pData, &pData->icmp_socket);
795	#endif
796	/*
797	* Check TCP sockets
798	*/
799	QSOCKET_FOREACH(so, so_next, tcp)
800	/* { */
801
802	/*
803	* FD_ISSET is meaningless on these sockets
804	* (and they can crash the program)
805	*/
806	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
807	CONTINUE(tcp);
808
809	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
810
811	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
812
813	/*
814	* Check for URG data
815	* This will soread as well, so no need to
816	* test for readfds below if this succeeds
817	*/
818
819	/* out-of-band data */
820	if (CHECK_FD_SET(so, NetworkEvents, xfds))
821	{
822	sorecvoob(pData, so);
823	}
824
825	/*
826	* Check sockets for reading
827	*/
828	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
829	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
830	{
831	/*
832	* Check for incoming connections
833	*/
834	if (so->so_state & SS_FACCEPTCONN)
835	{
836	TCP_CONNECT(pData, so);
837	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
838	if (!(NetworkEvents.lNetworkEvents & FD_CLOSE))
839	#endif
840	CONTINUE(tcp);
841	}
842
843	SOREAD(ret, pData, so, /fCloseIfNothingRead=/false);
844	/* Output it if we read something */
845	if (ret > 0)
846	TCP_OUTPUT(pData, sototcpcb(so));
847	}
848
849	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
850	/*
851	* Check for FD_CLOSE events.
852	*/
853	if (NetworkEvents.lNetworkEvents & FD_CLOSE)
854	{
855	/*
856	* drain the socket
857	*/
858	for (;;)
859	{
860	SOREAD(ret, pData, so, /fCloseIfNothingRead=/true);
861	if (ret > 0)
862	TCP_OUTPUT(pData, sototcpcb(so));
863	else
864	break;
865	}
866	}
867	#endif
868
869	/*
870	* Check sockets for writing
871	*/
872	if (CHECK_FD_SET(so, NetworkEvents, writefds))
873	{
874	/*
875	* Check for non-blocking, still-connecting sockets
876	*/
877	if (so->so_state & SS_ISFCONNECTING)
878	{
879	Log2(("connecting %R[natsock] catched\n", so));
880	/* Connected */
881	so->so_state &= ~SS_ISFCONNECTING;
882
883	/*
884	* This should be probably guarded by PROBE_CONN too. Anyway,
885	* we disable it on OS/2 because the below send call returns
886	* EFAULT which causes the opened TCP socket to close right
887	* after it has been opened and connected.
888	*/
889	#ifndef RT_OS_OS2
890	ret = send(so->s, (const char *)&ret, 0, 0);
891	if (ret < 0)
892	{
893	/* XXXXX Must fix, zero bytes is a NOP */
894	if ( errno == EAGAIN
895	\|\| errno == EWOULDBLOCK
896	\|\| errno == EINPROGRESS
897	\|\| errno == ENOTCONN)
898	CONTINUE(tcp);
899
900	/* else failed */
901	so->so_state = SS_NOFDREF;
902	}
903	/* else so->so_state &= ~SS_ISFCONNECTING; */
904	#endif
905
906	/*
907	* Continue tcp_input
908	*/
909	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
910	/* continue; */
911	}
912	else
913	SOWRITE(ret, pData, so);
914	/*
915	* XXX If we wrote something (a lot), there could be the need
916	* for a window update. In the worst case, the remote will send
917	* a window probe to get things going again.
918	*/
919	}
920
921	/*
922	* Probe a still-connecting, non-blocking socket
923	* to check if it's still alive
924	*/
925	#ifdef PROBE_CONN
926	if (so->so_state & SS_ISFCONNECTING)
927	{
928	ret = recv(so->s, (char *)&ret, 0, 0);
929
930	if (ret < 0)
931	{
932	/* XXX */
933	if ( errno == EAGAIN
934	\|\| errno == EWOULDBLOCK
935	\|\| errno == EINPROGRESS
936	\|\| errno == ENOTCONN)
937	{
938	CONTINUE(tcp); /* Still connecting, continue */
939	}
940
941	/* else failed */
942	so->so_state = SS_NOFDREF;
943
944	/* tcp_input will take care of it */
945	}
946	else
947	{
948	ret = send(so->s, &ret, 0, 0);
949	if (ret < 0)
950	{
951	/* XXX */
952	if ( errno == EAGAIN
953	\|\| errno == EWOULDBLOCK
954	\|\| errno == EINPROGRESS
955	\|\| errno == ENOTCONN)
956	{
957	CONTINUE(tcp);
958	}
959	/* else failed */
960	so->so_state = SS_NOFDREF;
961	}
962	else
963	so->so_state &= ~SS_ISFCONNECTING;
964
965	}
966	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
967	} /* SS_ISFCONNECTING */
968	#endif
969	LOOP_LABEL(tcp, so, so_next);
970	}
971
972	/*
973	* Now UDP sockets.
974	* Incoming packets are sent straight away, they're not buffered.
975	* Incoming UDP data isn't buffered either.
976	*/
977	QSOCKET_FOREACH(so, so_next, udp)
978	/* { */
979	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
980
981	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
982
983	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
984	{
985	SORECVFROM(pData, so);
986	}
987	LOOP_LABEL(udp, so, so_next);
988	}
989
990	}
991
992	#ifndef VBOX_WITH_SLIRP_MT
993	/*
994	* See if we can start outputting
995	*/
996	if (if_queued && link_up)
997	if_start(pData);
998	#endif
999
1000	STAM_PROFILE_STOP(&pData->StatPoll, a);
1001	}
1002
1003	#define ETH_ALEN 6
1004	#define ETH_HLEN 14
1005
1006	#define ARPOP_REQUEST 1 /* ARP request */
1007	#define ARPOP_REPLY 2 /* ARP reply */
1008
1009	struct ethhdr
1010	{
1011	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
1012	unsigned char h_source[ETH_ALEN]; /* source ether addr */
1013	unsigned short h_proto; /* packet type ID field */
1014	};
1015
1016	struct arphdr
1017	{
1018	unsigned short ar_hrd; /* format of hardware address */
1019	unsigned short ar_pro; /* format of protocol address */
1020	unsigned char ar_hln; /* length of hardware address */
1021	unsigned char ar_pln; /* length of protocol address */
1022	unsigned short ar_op; /* ARP opcode (command) */
1023
1024	/*
1025	* Ethernet looks like this : This bit is variable sized however...
1026	*/
1027	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1028	unsigned char ar_sip[4]; /* sender IP address */
1029	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1030	unsigned char ar_tip[4]; /* target IP address */
1031	};
1032
1033	static
1034	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1035	void arp_input(PNATState pData, struct mbuf *m)
1036	#else
1037	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
1038	#endif
1039	{
1040	struct ethhdr *eh;
1041	struct ethhdr *reh;
1042	struct arphdr *ah;
1043	struct arphdr *rah;
1044	int ar_op;
1045	struct ex_list *ex_ptr;
1046	uint32_t htip;
1047	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1048	uint8_t arp_reply[sizeof(struct arphdr) + ETH_HLEN];
1049	eh = (struct ethhdr *)pkt;
1050	#else
1051	struct mbuf *mr;
1052	eh = mtod(m, struct ethhdr *);
1053	#endif
1054	ah = (struct arphdr *)&eh[1];
1055	htip = ntohl((uint32_t)ah->ar_tip);
1056
1057	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1058	mr = m_get(pData);
1059	mr->m_data += if_maxlinkhdr;
1060	mr->m_len = sizeof(struct arphdr);
1061	rah = mtod(mr, struct arphdr *);
1062	#else
1063	reh = (struct ethhdr *)arp_reply;
1064	rah = (struct arphdr *)&reh[1];
1065	#endif
1066
1067	ar_op = ntohs(ah->ar_op);
1068	switch(ar_op)
1069	{
1070	case ARPOP_REQUEST:
1071	if ((htip & pData->netmask) == ntohl(special_addr.s_addr))
1072	{
1073	if ( CTL_CHECK(htip,CTL_DNS)
1074	\|\| CTL_CHECK(htip, CTL_ALIAS)
1075	\|\| CTL_CHECK(htip, CTL_TFTP))
1076	goto arp_ok;
1077	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
1078	{
1079	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
1080	goto arp_ok;
1081	}
1082	return;
1083	arp_ok:
1084
1085	#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1086	memcpy(reh->h_dest, eh->h_source, ETH_ALEN);
1087	memcpy(reh->h_source, &special_addr, ETH_ALEN);
1088	reh->h_source[5] = ah->ar_tip[3];
1089	reh->h_proto = htons(ETH_P_ARP);
1090	#endif
1091	rah->ar_hrd = htons(1);
1092	rah->ar_pro = htons(ETH_P_IP);
1093	rah->ar_hln = ETH_ALEN;
1094	rah->ar_pln = 4;
1095	rah->ar_op = htons(ARPOP_REPLY);
1096	memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN);
1097
1098	switch (htip & ~pData->netmask)
1099	{
1100	case CTL_DNS:
1101	case CTL_ALIAS:
1102	rah->ar_sha[5] = (uint8_t)(htip & ~pData->netmask);
1103	break;
1104	default:;
1105	}
1106
1107	memcpy(rah->ar_sip, ah->ar_tip, 4);
1108	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
1109	memcpy(rah->ar_tip, ah->ar_sip, 4);
1110	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1111	if_encap(pData, ETH_P_ARP, mr);
1112	m_free(pData, m);
1113	#else
1114	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
1115	#endif
1116	}
1117	break;
1118	default:
1119	break;
1120	}
1121	}
1122
1123	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
1124	{
1125	struct mbuf *m;
1126	int proto;
1127	static bool fWarnedIpv6;
1128
1129	if (pkt_len < ETH_HLEN)
1130	{
1131	LogRel(("NAT: packet having size %d has been ingnored\n", pkt_len));
1132	return;
1133	}
1134
1135	m = m_get(pData);
1136	if (!m)
1137	{
1138	LogRel(("can't allocate new mbuf\n"));
1139	return;
1140	}
1141
1142	/* Note: we add to align the IP header */
1143
1144	if (M_FREEROOM(m) < pkt_len)
1145	m_inc(m, pkt_len);
1146
1147	m->m_len = pkt_len ;
1148	memcpy(m->m_data, pkt, pkt_len);
1149
1150	proto = ntohs((uint16_t )(pkt + 12));
1151	switch(proto)
1152	{
1153	case ETH_P_ARP:
1154	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1155	arp_input(pData, m);
1156	#else
1157	arp_input(pData, pkt, pkt_len);
1158	m_free(pData, m);
1159	#endif
1160	break;
1161	case ETH_P_IP:
1162	/* Update time. Important if the network is very quiet, as otherwise
1163	* the first outgoing connection gets an incorrect timestamp. */
1164	updtime(pData);
1165	m->m_data += ETH_HLEN;
1166	m->m_len -= ETH_HLEN;
1167	ip_input(pData, m);
1168	break;
1169	case ETH_P_IPV6:
1170	m_free(pData, m);
1171	if (!fWarnedIpv6)
1172	{
1173	LogRel(("NAT: IPv6 not supported\n"));
1174	fWarnedIpv6 = true;
1175	}
1176	break;
1177	default:
1178	LogRel(("NAT: Unsupported protocol %x\n", proto));
1179	m_free(pData, m);
1180	break;
1181	}
1182	}
1183
1184	/* output the IP packet to the ethernet device */
1185	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1186	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m)
1187	#else
1188	void if_encap(PNATState pData, uint8_t *ip_data, int ip_data_len)
1189	#endif
1190	{
1191	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1192	struct ethhdr *eh;
1193	uint8_t *buf = RTMemAlloc(1600);
1194	m->m_data -= if_maxlinkhdr;
1195	m->m_len += ETH_HLEN;
1196	eh = mtod(m, struct ethhdr *);
1197	#else
1198	uint8_t buf[1600];
1199	struct ethhdr eh = (struct ethhdr )buf;
1200
1201	if (ip_data_len + ETH_HLEN > sizeof(buf))
1202	return;
1203
1204	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
1205	#endif
1206
1207
1208	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
1209	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
1210	/* XXX: not correct */
1211	eh->h_source[5] = CTL_ALIAS;
1212	#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1213	eh->h_proto = htons(eth_proto);
1214	#if 0
1215	slirp_output(pData->pvUser, m, mtod(m, uint8_t *), m->m_len);
1216	#else
1217	memcpy(buf, mtod(m, uint8_t *), m->m_len);
1218	slirp_output(pData->pvUser, NULL, buf, m->m_len);
1219	m_free(pData, m);
1220	#endif
1221	#else
1222	eh->h_proto = htons(ETH_P_IP);
1223	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
1224	#endif
1225	}
1226
1227	int slirp_redir(PNATState pData, int is_udp, int host_port,
1228	struct in_addr guest_addr, int guest_port)
1229	{
1230	if (is_udp)
1231	{
1232	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
1233	htons(guest_port), 0))
1234	return -1;
1235	}
1236	else
1237	{
1238	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
1239	htons(guest_port), 0))
1240	return -1;
1241	}
1242	return 0;
1243	}
1244
1245	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
1246	int guest_port)
1247	{
1248	return add_exec(&exec_list, do_pty, (char *)args,
1249	addr_low_byte, htons(guest_port));
1250	}
1251
1252	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
1253	{
1254	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1255	}
1256
1257	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
1258	HANDLE *slirp_get_events(PNATState pData)
1259	{
1260	return pData->phEvents;
1261	}
1262	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1263	{
1264	pData->phEvents[index] = hEvent;
1265	}
1266	#endif
1267
1268	unsigned int slirp_get_timeout_ms(PNATState pData)
1269	{
1270	if (link_up)
1271	{
1272	if (time_fasttimo)
1273	return 2;
1274	if (do_slowtimo)
1275	return 500; /* see PR_SLOWHZ */
1276	}
1277	return 0;
1278	}
1279
1280	/*
1281	* this function called from NAT thread
1282	*/
1283	void slirp_post_sent(PNATState pData, void *pvArg)
1284	{
1285	struct socket *so = 0;
1286	struct tcpcb *tp = 0;
1287	struct mbuf m = (struct mbuf )pvArg;
1288	m_free(pData, m);
1289	}
1290	#ifdef VBOX_WITH_SLIRP_MT
1291	void slirp_process_queue(PNATState pData)
1292	{
1293	RTReqProcess(pData->pReqQueue, RT_INDEFINITE_WAIT);
1294	}
1295	void *slirp_get_queue(PNATState pData)
1296	{
1297	return pData->pReqQueue;
1298	}
1299	#endif

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 16448

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