slirp.c@ 14925

Last change on this file since 14925 was 14882, checked in by vboxsync, 16 years ago
registered log formatter prining IPv4 addresses on %R[IP4]
Property svn:eol-style set to `native`
File size: 32.4 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	static const uint8_t special_ethaddr[6] = {
14	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
15	};
16
17	#ifdef _WIN32
18
19	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
20	struct in_addr *pdns_addr,
21	const char **ppszDomain)
22	{
23	int rc = 0;
24	FIXED_INFO *FixedInfo = NULL;
25	ULONG BufLen;
26	DWORD ret;
27	IP_ADDR_STRING *pIPAddr;
28	struct in_addr tmp_addr;
29
30	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
31	BufLen = sizeof(FIXED_INFO);
32
33	/** @todo: this API returns all DNS servers, no matter whether the
34	* corresponding network adapter is disabled or not. Maybe replace
35	* this by GetAdapterAddresses(), which is XP/Vista only though. */
36	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen))
37	{
38	if (FixedInfo)
39	{
40	GlobalFree(FixedInfo);
41	FixedInfo = NULL;
42	}
43	FixedInfo = GlobalAlloc(GPTR, BufLen);
44	}
45
46	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS)
47	{
48	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
49	if (FixedInfo)
50	{
51	GlobalFree(FixedInfo);
52	FixedInfo = NULL;
53	}
54	rc = -1;
55	goto get_dns_prefix;
56	}
57
58	pIPAddr = &(FixedInfo->DnsServerList);
59	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
60	Log(("nat: DNS Servers:\n"));
61	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
62	LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
63	*pdns_addr = tmp_addr;
64
65	pIPAddr = FixedInfo -> DnsServerList.Next;
66	while (pIPAddr)
67	{
68	if (fVerbose)
69	LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
70	pIPAddr = pIPAddr ->Next;
71	}
72	if (FixedInfo)
73	{
74	GlobalFree(FixedInfo);
75	FixedInfo = NULL;
76	}
77
78	get_dns_prefix:
79	if (ppszDomain)
80	{
81	OSVERSIONINFO ver;
82	char szDnsDomain[256];
83	DWORD dwSize = sizeof(szDnsDomain);
84
85	*ppszDomain = NULL;
86	GetVersionEx(&ver);
87	if (ver.dwMajorVersion >= 5)
88	{
89	/* GetComputerNameEx exists in Windows versions starting with 2000. */
90	if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
91	{
92	if (szDnsDomain[0])
93	{
94	/* Just non-empty strings are valid. */
95	*ppszDomain = RTStrDup(szDnsDomain);
96	if (pData->fPassDomain)
97	{
98	if (fVerbose)
99	LogRel(("NAT: passing domain name %s\n", szDnsDomain));
100	}
101	else
102	Log(("nat: ignoring domain %s\n", szDnsDomain));
103	}
104	}
105	else
106	Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
107	}
108	}
109	return rc;
110	}
111
112	#else
113
114	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
115	struct in_addr *pdns_addr,
116	const char **ppszDomain)
117	{
118	char buff[512];
119	char buff2[256];
120	FILE *f;
121	int found = 0;
122	struct in_addr tmp_addr;
123
124	#ifdef RT_OS_OS2
125	/* Try various locations. */
126	char *etc = getenv("ETC");
127	f = NULL;
128	if (etc)
129	{
130	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
131	f = fopen(buff, "rt");
132	}
133	if (!f)
134	{
135	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
136	f = fopen(buff, "rt");
137	}
138	if (!f)
139	{
140	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
141	f = fopen(buff, "rt");
142	}
143	#else
144	f = fopen("/etc/resolv.conf", "r");
145	#endif
146	if (!f)
147	return -1;
148
149	if (ppszDomain)
150	*ppszDomain = NULL;
151	Log(("nat: DNS Servers:\n"));
152	while (fgets(buff, 512, f) != NULL)
153	{
154	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1)
155	{
156	if (!inet_aton(buff2, &tmp_addr))
157	continue;
158	if (tmp_addr.s_addr == loopback_addr.s_addr)
159	tmp_addr = our_addr;
160	/* If it's the first one, set it to dns_addr */
161	if (!found)
162	{
163	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
164	LogRel(("NAT: DNS address: %s\n", buff2));
165	*pdns_addr = tmp_addr;
166	}
167	else
168	{
169	if (fVerbose)
170	LogRel(("NAT: ignored DNS address: %s\n", buff2));
171	}
172	found++;
173	}
174	if ( ppszDomain
175	&& (!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6)))
176	{
177	/* Domain name/search list present. Pick first entry */
178	if (*ppszDomain == NULL)
179	{
180	char *tok;
181	char *saveptr;
182	tok = strtok_r(&buff[6], " \t\n", &saveptr);
183	if (tok)
184	{
185	*ppszDomain = RTStrDup(tok);
186	if (pData->fPassDomain)
187	{
188	if (fVerbose)
189	LogRel(("NAT: passing domain name %s\n", tok));
190	}
191	else
192	Log(("nat: ignoring domain %s\n", tok));
193	}
194	}
195	}
196	}
197	fclose(f);
198	if (!found)
199	return -1;
200	return 0;
201	}
202
203	#endif
204
205	int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
206	{
207	return get_dns_addr_domain(pData, false, pdns_addr, NULL);
208	}
209
210	int slirp_init(PNATState ppData, const char pszNetAddr, uint32_t u32Netmask,
211	bool fPassDomain, const char *pszTFTPPrefix,
212	const char pszBootFile, void pvUser)
213	{
214	int fNATfailed = 0;
215	PNATState pData = malloc(sizeof(NATState));
216	*ppData = pData;
217	if (!pData)
218	return VERR_NO_MEMORY;
219	if (u32Netmask & 0x1f)
220	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
221	return VERR_INVALID_PARAMETER;
222	memset(pData, '\0', sizeof(NATState));
223	pData->fPassDomain = fPassDomain;
224	pData->pvUser = pvUser;
225	#if ARCH_BITS == 64 && !defined(VBOX_WITH_BSD_REASS)
226	pData->cpvHashUsed = 1;
227	#endif
228	tftp_prefix = pszTFTPPrefix;
229	bootp_filename = pszBootFile;
230	pData->netmask = u32Netmask;
231
232	#ifdef _WIN32
233	{
234	WSADATA Data;
235	WSAStartup(MAKEWORD(2,0), &Data);
236	}
237	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
238	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
239	#endif
240	#endif
241
242	Assert(sizeof(struct ip) == 20);
243	link_up = 1;
244
245	debug_init();
246	if_init(pData);
247	ip_init(pData);
248
249	/* Initialise mbufs after setting the MTU */
250	m_init(pData);
251
252	/* set default addresses */
253	inet_aton("127.0.0.1", &loopback_addr);
254	inet_aton("127.0.0.1", &dns_addr);
255
256	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
257	fNATfailed = 1;
258
259	inet_aton(pszNetAddr, &special_addr);
260	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
261	getouraddr(pData);
262	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
263	}
264
265	/**
266	* Statistics counters.
267	*/
268	void slirp_register_timers(PNATState pData, PPDMDRVINS pDrvIns)
269	{
270	#ifndef VBOX_WITHOUT_RELEASE_STATISTICS
271	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFill, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
272	STAMUNIT_TICKS_PER_CALL, "Profiling slirp fills", "/Drivers/NAT%d/Fill", pDrvIns->iInstance);
273	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPoll, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
274	STAMUNIT_TICKS_PER_CALL, "Profiling slirp polls", "/Drivers/NAT%d/Poll", pDrvIns->iInstance);
275	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFastTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
276	STAMUNIT_TICKS_PER_CALL, "Profiling slirp fast timer", "/Drivers/NAT%d/TimerFast", pDrvIns->iInstance);
277	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatSlowTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
278	STAMUNIT_TICKS_PER_CALL, "Profiling slirp slow timer", "/Drivers/NAT%d/TimerSlow", pDrvIns->iInstance);
279	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
280	STAMUNIT_COUNT, "TCP sockets", "/Drivers/NAT%d/SockTCP", pDrvIns->iInstance);
281	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
282	STAMUNIT_COUNT, "TCP sockets active", "/Drivers/NAT%d/SockTCPHot", pDrvIns->iInstance);
283	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
284	STAMUNIT_COUNT, "UDP sockets", "/Drivers/NAT%d/SockUDP", pDrvIns->iInstance);
285	PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
286	STAMUNIT_COUNT, "UDP sockets active", "/Drivers/NAT%d/SockUDPHot", pDrvIns->iInstance);
287	#endif /* VBOX_WITHOUT_RELEASE_STATISTICS */
288	}
289
290	/**
291	* Marks the link as up, making it possible to establish new connections.
292	*/
293	void slirp_link_up(PNATState pData)
294	{
295	link_up = 1;
296	}
297
298	/**
299	* Marks the link as down and cleans up the current connections.
300	*/
301	void slirp_link_down(PNATState pData)
302	{
303	struct socket *so;
304
305	while ((so = tcb.so_next) != &tcb)
306	{
307	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
308	sofree(pData, so);
309	else
310	tcp_drop(pData, sototcpcb(so), 0);
311	}
312
313	while ((so = udb.so_next) != &udb)
314	udp_detach(pData, so);
315
316	link_up = 0;
317	}
318
319	/**
320	* Terminates the slirp component.
321	*/
322	void slirp_term(PNATState pData)
323	{
324	if (pData->pszDomain)
325	RTStrFree((char )(void )pData->pszDomain);
326
327	#if ARCH_BITS == 64 && !defined(VBOX_WITH_BSD_REASS)
328	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
329	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
330	#endif
331
332	slirp_link_down(pData);
333	#ifdef WIN32
334	WSACleanup();
335	#endif
336	#ifdef LOG_ENABLED
337	Log(("\n"
338	"NAT statistics\n"
339	"--------------\n"
340	"\n"));
341	ipstats(pData);
342	tcpstats(pData);
343	udpstats(pData);
344	icmpstats(pData);
345	mbufstats(pData);
346	sockstats(pData);
347	Log(("\n"
348	"\n"
349	"\n"));
350	#endif
351	free(pData);
352	}
353
354
355	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
356	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
357	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
358
359	/*
360	* curtime kept to an accuracy of 1ms
361	*/
362	#ifdef _WIN32
363	static void updtime(PNATState pData)
364	{
365	struct _timeb tb;
366
367	_ftime(&tb);
368	curtime = (u_int)tb.time * (u_int)1000;
369	curtime += (u_int)tb.millitm;
370	}
371	#else
372	static void updtime(PNATState pData)
373	{
374	gettimeofday(&tt, 0);
375
376	curtime = (u_int)tt.tv_sec * (u_int)1000;
377	curtime += (u_int)tt.tv_usec / (u_int)1000;
378
379	if ((tt.tv_usec % 1000) >= 500)
380	curtime++;
381	}
382	#endif
383
384	void slirp_select_fill(PNATState pData, int *pnfds,
385	fd_set readfds, fd_set writefds, fd_set *xfds)
386	{
387	struct socket so, so_next;
388	int nfds;
389	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
390	int rc;
391	int error;
392	#endif
393	#ifdef VBOX_WITH_BSD_REASS
394	int i;
395	#endif /* VBOX_WITH_BSD_REASS */
396
397	STAM_REL_PROFILE_START(&pData->StatFill, a);
398
399	nfds = *pnfds;
400
401	/*
402	* First, TCP sockets
403	*/
404	do_slowtimo = 0;
405	if (link_up)
406	{
407	/*
408	* *_slowtimo needs calling if there are IP fragments
409	* in the fragment queue, or there are TCP connections active
410	*/
411	#ifndef VBOX_WITH_BSD_REASS
412	do_slowtimo = ((tcb.so_next != &tcb)
413	\|\| ((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
414	#else /* !VBOX_WITH_BSD_REASS */
415	/* XXX:
416	* triggering of fragment expiration should be the same but use new macroses
417	*/
418	for (i = 0; i < IPREASS_NHASH; i++)
419	{
420	if (!TAILQ_EMPTY(&ipq[i]))
421	{
422	do_slowtimo = 1;
423	break;
424	}
425	}
426	do_slowtimo \|= (tcb.so_next != &tcb);
427	#endif /* VBOX_WITH_BSD_REASS */
428
429	STAM_REL_COUNTER_RESET(&pData->StatTCP);
430	STAM_REL_COUNTER_RESET(&pData->StatTCPHot);
431
432	for (so = tcb.so_next; so != &tcb; so = so_next)
433	{
434	so_next = so->so_next;
435
436	STAM_REL_COUNTER_INC(&pData->StatTCP);
437
438	/*
439	* See if we need a tcp_fasttimo
440	*/
441	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
442	time_fasttimo = curtime; /* Flag when we want a fasttimo */
443
444	/*
445	* NOFDREF can include still connecting to local-host,
446	* newly socreated() sockets etc. Don't want to select these.
447	*/
448	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
449	continue;
450
451	/*
452	* Set for reading sockets which are accepting
453	*/
454	if (so->so_state & SS_FACCEPTCONN)
455	{
456	STAM_REL_COUNTER_INC(&pData->StatTCPHot);
457	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
458	FD_SET(so->s, readfds);
459	UPD_NFDS(so->s);
460	#else
461	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
462	if (rc == SOCKET_ERROR)
463	{
464	socket_error:
465	error = WSAGetLastError();
466	LogRel(("WSAEventSelector error %d (so=%x, socket=%s, event=%x)\n", error, so, so->s, VBOX_SOCKET_EVENT));
467	}
468	#endif
469	continue;
470	}
471
472	/*
473	* Set for writing sockets which are connecting
474	*/
475	if (so->so_state & SS_ISFCONNECTING)
476	{
477	STAM_REL_COUNTER_INC(&pData->StatTCPHot);
478	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
479	FD_SET(so->s, writefds);
480	UPD_NFDS(so->s);
481	#else
482	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
483	if (rc == SOCKET_ERROR)
484	goto socket_error;
485	#endif
486	continue;
487	}
488
489	/*
490	* Set for writing if we are connected, can send more, and
491	* we have something to send
492	*/
493	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc)
494	{
495	STAM_REL_COUNTER_INC(&pData->StatTCPHot);
496	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
497	FD_SET(so->s, writefds);
498	UPD_NFDS(so->s);
499	#else
500	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT\|FD_OOB);
501	if (rc == SOCKET_ERROR)
502	goto socket_error;
503	continue; /* we're using the widest mask for event */
504	#endif
505	}
506
507	/*
508	* Set for reading (and urgent data) if we are connected, can
509	* receive more, and we have room for it XXX /2 ?
510	*/
511	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2)))
512	{
513	STAM_REL_COUNTER_INC(&pData->StatTCPHot);
514	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
515	FD_SET(so->s, readfds);
516	FD_SET(so->s, xfds);
517	UPD_NFDS(so->s);
518	#else
519	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_OOB\|FD_READ\|FD_WRITE\|FD_ACCEPT\|FD_CONNECT);
520	if (rc == SOCKET_ERROR)
521	goto socket_error;
522	continue; /* we're using the widest mask for event */
523	#endif
524	}
525	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
526	rc = WSAEventSelect(so->s, NULL, 0);
527	if (rc == SOCKET_ERROR)
528	goto socket_error;
529	#endif
530	}
531
532	/*
533	* UDP sockets
534	*/
535	STAM_REL_COUNTER_RESET(&pData->StatUDP);
536	STAM_REL_COUNTER_RESET(&pData->StatUDPHot);
537
538	for (so = udb.so_next; so != &udb; so = so_next)
539	{
540	so_next = so->so_next;
541
542	STAM_REL_COUNTER_INC(&pData->StatUDP);
543
544	/*
545	* See if it's timed out
546	*/
547	if (so->so_expire)
548	{
549	if (so->so_expire <= curtime)
550	{
551	udp_detach(pData, so);
552	continue;
553	}
554	else
555	do_slowtimo = 1; /* Let socket expire */
556	}
557
558	/*
559	* When UDP packets are received from over the link, they're
560	* sendto()'d straight away, so no need for setting for writing
561	* Limit the number of packets queued by this session to 4.
562	* Note that even though we try and limit this to 4 packets,
563	* the session could have more queued if the packets needed
564	* to be fragmented.
565	*
566	* (XXX <= 4 ?)
567	*/
568	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
569	{
570	STAM_REL_COUNTER_INC(&pData->StatUDPHot);
571	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
572	FD_SET(so->s, readfds);
573	UPD_NFDS(so->s);
574	#else
575	rc = WSAEventSelect(so->s, VBOX_SOCKET_EVENT, FD_READ\|FD_WRITE\|FD_OOB\|FD_ACCEPT);
576	if (rc == SOCKET_ERROR)
577	goto socket_error;
578	continue;
579	#endif
580	}
581	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
582	else
583	{
584	rc = WSAEventSelect(so->s, NULL, 0);
585	if (rc != SOCKET_ERROR)
586	goto socket_error;
587	}
588	#endif
589	}
590	}
591
592	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
593	*pnfds = nfds;
594	#else
595	*pnfds = VBOX_EVENT_COUNT;
596	#endif
597
598	STAM_REL_PROFILE_STOP(&pData->StatFill, a);
599	}
600
601	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
602	{
603	struct socket so, so_next;
604	int ret;
605	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
606	WSANETWORKEVENTS NetworkEvents;
607	int rc;
608	int error;
609	#endif
610	STAM_REL_PROFILE_START(&pData->StatPoll, a);
611
612	/* Update time */
613	updtime(pData);
614
615	/*
616	* See if anything has timed out
617	*/
618	if (link_up)
619	{
620	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
621	{
622	STAM_REL_PROFILE_START(&pData->StatFastTimer, a);
623	tcp_fasttimo(pData);
624	time_fasttimo = 0;
625	STAM_REL_PROFILE_STOP(&pData->StatFastTimer, a);
626	}
627	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
628	{
629	STAM_REL_PROFILE_START(&pData->StatSlowTimer, a);
630	ip_slowtimo(pData);
631	tcp_slowtimo(pData);
632	last_slowtimo = curtime;
633	STAM_REL_PROFILE_STOP(&pData->StatSlowTimer, a);
634	}
635	}
636	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
637	if (!readfds && !writefds && !xfds)
638	return; /* only timer update */
639	#endif
640
641	/*
642	* Check sockets
643	*/
644	if (link_up)
645	{
646	/*
647	* Check TCP sockets
648	*/
649	for (so = tcb.so_next; so != &tcb; so = so_next)
650	{
651	so_next = so->so_next;
652
653	/*
654	* FD_ISSET is meaningless on these sockets
655	* (and they can crash the program)
656	*/
657	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
658	continue;
659
660	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
661	rc = WSAEnumNetworkEvents(so->s, VBOX_SOCKET_EVENT, &NetworkEvents);
662	if (rc == SOCKET_ERROR)
663	{
664	error = WSAGetLastError();
665	LogRel(("WSAEnumNetworkEvents TCP error %d\n", error));
666	continue;
667	}
668	#endif
669
670	/*
671	* Check for URG data
672	* This will soread as well, so no need to
673	* test for readfds below if this succeeds
674	*/
675	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
676	if (FD_ISSET(so->s, xfds))
677	#else
678	/* out-of-band data */
679	if ((NetworkEvents.lNetworkEvents & FD_OOB) && NetworkEvents.iErrorCode[FD_OOB_BIT] == 0)
680	#endif
681	{
682	sorecvoob(pData, so);
683	}
684
685	/*
686	* Check sockets for reading
687	*/
688	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
689	else if (FD_ISSET(so->s, readfds))
690	#else
691	else if ((NetworkEvents.lNetworkEvents & FD_READ) && (NetworkEvents.iErrorCode[FD_READ_BIT] == 0))
692	#endif
693	{
694	/*
695	* Check for incoming connections
696	*/
697	if (so->so_state & SS_FACCEPTCONN)
698	{
699	tcp_connect(pData, so);
700	continue;
701	}
702
703	ret = soread(pData, so);
704	/* Output it if we read something */
705	if (ret > 0)
706	tcp_output(pData, sototcpcb(so));
707	}
708
709	/*
710	* Check sockets for writing
711	*/
712	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
713	if (FD_ISSET(so->s, writefds))
714	#else
715	if ((NetworkEvents.lNetworkEvents & FD_WRITE) && (NetworkEvents.iErrorCode[FD_WRITE_BIT] == 0))
716	#endif
717	{
718	/*
719	* Check for non-blocking, still-connecting sockets
720	*/
721	if (so->so_state & SS_ISFCONNECTING)
722	{
723	/* Connected */
724	so->so_state &= ~SS_ISFCONNECTING;
725
726	/*
727	* This should be probably guarded by PROBE_CONN too. Anyway,
728	* we disable it on OS/2 because the below send call returns
729	* EFAULT which causes the opened TCP socket to close right
730	* after it has been opened and connected.
731	*/
732	#ifndef RT_OS_OS2
733	ret = send(so->s, (const char *)&ret, 0, 0);
734	if (ret < 0)
735	{
736	/* XXXXX Must fix, zero bytes is a NOP */
737	if ( errno == EAGAIN
738	\|\| errno == EWOULDBLOCK
739	\|\| errno == EINPROGRESS
740	\|\| errno == ENOTCONN)
741	continue;
742
743	/* else failed */
744	so->so_state = SS_NOFDREF;
745	}
746	/* else so->so_state &= ~SS_ISFCONNECTING; */
747	#endif
748
749	/*
750	* Continue tcp_input
751	*/
752	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
753	/* continue; */
754	} else
755	ret = sowrite(pData, so);
756	/*
757	* XXXXX If we wrote something (a lot), there
758	* could be a need for a window update.
759	* In the worst case, the remote will send
760	* a window probe to get things going again
761	*/
762	}
763
764	/*
765	* Probe a still-connecting, non-blocking socket
766	* to check if it's still alive
767	*/
768	#ifdef PROBE_CONN
769	if (so->so_state & SS_ISFCONNECTING)
770	{
771	ret = recv(so->s, (char *)&ret, 0, 0);
772
773	if (ret < 0)
774	{
775	/* XXX */
776	if ( errno == EAGAIN
777	\|\| errno == EWOULDBLOCK
778	\|\| errno == EINPROGRESS
779	\|\| errno == ENOTCONN)
780	{
781	continue; /* Still connecting, continue */
782	}
783
784	/* else failed */
785	so->so_state = SS_NOFDREF;
786
787	/* tcp_input will take care of it */
788	}
789	else
790	{
791	ret = send(so->s, &ret, 0, 0);
792	if (ret < 0)
793	{
794	/* XXX */
795	if ( errno == EAGAIN
796	\|\| errno == EWOULDBLOCK
797	\|\| errno == EINPROGRESS
798	\|\| errno == ENOTCONN)
799	{
800	continue;
801	}
802	/* else failed */
803	so->so_state = SS_NOFDREF;
804	}
805	else
806	so->so_state &= ~SS_ISFCONNECTING;
807
808	}
809	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
810	} /* SS_ISFCONNECTING */
811	#endif
812	}
813
814	/*
815	* Now UDP sockets.
816	* Incoming packets are sent straight away, they're not buffered.
817	* Incoming UDP data isn't buffered either.
818	*/
819	for (so = udb.so_next; so != &udb; so = so_next)
820	{
821	so_next = so->so_next;
822
823	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
824	rc = WSAEnumNetworkEvents(so->s, VBOX_SOCKET_EVENT, &NetworkEvents);
825	if (rc == SOCKET_ERROR)
826	{
827	error = WSAGetLastError();
828	LogRel(("WSAEnumNetworkEvents TCP error %d\n", error));
829	continue;
830	}
831	#endif
832	#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) \|\| !defined(RT_OS_WINDOWS)
833	if (so->s != -1 && FD_ISSET(so->s, readfds))
834	#else
835	if ((NetworkEvents.lNetworkEvents & FD_READ) && (NetworkEvents.iErrorCode[FD_READ_BIT] == 0))
836	#endif
837	{
838	sorecvfrom(pData, so);
839	}
840	}
841	}
842
843	/*
844	* See if we can start outputting
845	*/
846	if (if_queued && link_up)
847	if_start(pData);
848
849	STAM_REL_PROFILE_STOP(&pData->StatPoll, a);
850	}
851
852	#define ETH_ALEN 6
853	#define ETH_HLEN 14
854
855	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
856	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
857
858	#define ARPOP_REQUEST 1 /* ARP request */
859	#define ARPOP_REPLY 2 /* ARP reply */
860
861	struct ethhdr
862	{
863	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
864	unsigned char h_source[ETH_ALEN]; /* source ether addr */
865	unsigned short h_proto; /* packet type ID field */
866	};
867
868	struct arphdr
869	{
870	unsigned short ar_hrd; /* format of hardware address */
871	unsigned short ar_pro; /* format of protocol address */
872	unsigned char ar_hln; /* length of hardware address */
873	unsigned char ar_pln; /* length of protocol address */
874	unsigned short ar_op; /* ARP opcode (command) */
875
876	/*
877	* Ethernet looks like this : This bit is variable sized however...
878	*/
879	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
880	unsigned char ar_sip[4]; /* sender IP address */
881	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
882	unsigned char ar_tip[4]; /* target IP address */
883	};
884
885	static
886	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
887	{
888	struct ethhdr eh = (struct ethhdr )pkt;
889	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
890	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
891	struct ethhdr reh = (struct ethhdr )arp_reply;
892	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
893	int ar_op;
894	struct ex_list *ex_ptr;
895	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
896
897	ar_op = ntohs(ah->ar_op);
898	switch(ar_op)
899	{
900	case ARPOP_REQUEST:
901	if ((htip & pData->netmask) == ntohl(special_addr.s_addr))
902	{
903	if ( (htip & ~pData->netmask) == CTL_DNS
904	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
905	goto arp_ok;
906	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
907	{
908	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
909	goto arp_ok;
910	}
911	return;
912	arp_ok:
913	/* XXX: make an ARP request to have the client address */
914	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
915
916	/* ARP request for alias/dns mac address */
917	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
918	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
919	reh->h_source[5] = ah->ar_tip[3];
920	reh->h_proto = htons(ETH_P_ARP);
921
922	rah->ar_hrd = htons(1);
923	rah->ar_pro = htons(ETH_P_IP);
924	rah->ar_hln = ETH_ALEN;
925	rah->ar_pln = 4;
926	rah->ar_op = htons(ARPOP_REPLY);
927	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
928	memcpy(rah->ar_sip, ah->ar_tip, 4);
929	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
930	memcpy(rah->ar_tip, ah->ar_sip, 4);
931	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
932	}
933	break;
934	default:
935	break;
936	}
937	}
938
939	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
940	{
941	struct mbuf *m;
942	int proto;
943
944	if (pkt_len < ETH_HLEN)
945	return;
946
947	proto = ntohs((uint16_t )(pkt + 12));
948	switch(proto)
949	{
950	case ETH_P_ARP:
951	arp_input(pData, pkt, pkt_len);
952	break;
953	case ETH_P_IP:
954	/* Update time. Important if the network is very quiet, as otherwise
955	* the first outgoing connection gets an incorrect timestamp. */
956	updtime(pData);
957
958	m = m_get(pData);
959	if (!m)
960	return;
961	/* Note: we add to align the IP header */
962	if (M_FREEROOM(m) < pkt_len + 2)
963	{
964	m_inc(m, pkt_len + 2);
965	}
966	m->m_len = pkt_len + 2;
967	memcpy(m->m_data + 2, pkt, pkt_len);
968
969	m->m_data += 2 + ETH_HLEN;
970	m->m_len -= 2 + ETH_HLEN;
971
972	ip_input(pData, m);
973	break;
974	default:
975	break;
976	}
977	}
978
979	/* output the IP packet to the ethernet device */
980	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
981	{
982	uint8_t buf[1600];
983	struct ethhdr eh = (struct ethhdr )buf;
984
985	if (ip_data_len + ETH_HLEN > sizeof(buf))
986	return;
987
988	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
989	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
990	/* XXX: not correct */
991	eh->h_source[5] = CTL_ALIAS;
992	eh->h_proto = htons(ETH_P_IP);
993	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
994	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
995	}
996
997	int slirp_redir(PNATState pData, int is_udp, int host_port,
998	struct in_addr guest_addr, int guest_port)
999	{
1000	if (is_udp)
1001	{
1002	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
1003	htons(guest_port), 0))
1004	return -1;
1005	}
1006	else
1007	{
1008	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
1009	htons(guest_port), 0))
1010	return -1;
1011	}
1012	return 0;
1013	}
1014
1015	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
1016	int guest_port)
1017	{
1018	return add_exec(&exec_list, do_pty, (char *)args,
1019	addr_low_byte, htons(guest_port));
1020	}
1021
1022	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
1023	{
1024	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1025	}
1026
1027	#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
1028	HANDLE *slirp_get_events(PNATState pData)
1029	{
1030	return pData->phEvents;
1031	}
1032	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1033	{
1034	pData->phEvents[index] = hEvent;
1035	}
1036	#endif
1037
1038	unsigned int slirp_get_timeout_ms(PNATState pData)
1039	{
1040	if (link_up)
1041	{
1042	if (time_fasttimo)
1043	return 2;
1044	if (do_slowtimo)
1045	return 500;
1046	}
1047	return 0;
1048	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 14925

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