slirp.c@ 15919

Last change on this file since 15919 was 15914, checked in by vboxsync, 16 years ago
NAT: temporally enable intermediate buffer on send, to avoid overhead on creating queue entry.
Property svn:eol-style set to `native`
File size: 36.8 KB

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

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 15919

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