slirp.c@ 58077

Last change on this file since 58077 was 58077, checked in by vboxsync, 10 years ago
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1	/* $Id: slirp.c 58077 2015-10-07 10:05:54Z vboxsync $ */
2	/** @file
3	* NAT - slirp glue.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*
19	* This code is based on:
20	*
21	* libslirp glue
22	*
23	* Copyright (c) 2004-2008 Fabrice Bellard
24	*
25	* Permission is hereby granted, free of charge, to any person obtaining a copy
26	* of this software and associated documentation files (the "Software"), to deal
27	* in the Software without restriction, including without limitation the rights
28	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
29	* copies of the Software, and to permit persons to whom the Software is
30	* furnished to do so, subject to the following conditions:
31	*
32	* The above copyright notice and this permission notice shall be included in
33	* all copies or substantial portions of the Software.
34	*
35	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
36	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
37	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
38	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
39	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
40	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
41	* THE SOFTWARE.
42	*/
43
44	#include "slirp.h"
45	#ifdef RT_OS_OS2
46	# include <paths.h>
47	#endif
48
49	#include <VBox/err.h>
50	#include <VBox/vmm/dbgf.h>
51	#include <VBox/vmm/pdmdrv.h>
52	#include <iprt/assert.h>
53	#include <iprt/file.h>
54	#ifndef RT_OS_WINDOWS
55	# include <sys/ioctl.h>
56	# include <poll.h>
57	# include <netinet/in.h>
58	#else
59	# include <Winnls.h>
60	# define _WINSOCK2API_
61	# include <IPHlpApi.h>
62	#endif
63	#include <alias.h>
64
65	#ifndef RT_OS_WINDOWS
66	/**
67	* XXX: It shouldn't be non-Windows specific.
68	* resolv_conf_parser.h client's structure isn't OS specific, it's just need to be generalized a
69	* a bit to replace slirp_state.h DNS server (domain) lists with rcp_state like structure.
70	*/
71	# include "resolv_conf_parser.h"
72	#endif
73
74	#ifndef RT_OS_WINDOWS
75	# define DO_ENGAGE_EVENT1(so, fdset, label) \
76	do { \
77	if ( so->so_poll_index != -1 \
78	&& so->s == polls[so->so_poll_index].fd) \
79	{ \
80	polls[so->so_poll_index].events \|= N_(fdset ## _poll); \
81	break; \
82	} \
83	AssertRelease(poll_index < (nfds)); \
84	AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
85	polls[poll_index].fd = (so)->s; \
86	(so)->so_poll_index = poll_index; \
87	polls[poll_index].events = N_(fdset ## _poll); \
88	polls[poll_index].revents = 0; \
89	poll_index++; \
90	} while (0)
91
92	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
93	do { \
94	if ( so->so_poll_index != -1 \
95	&& so->s == polls[so->so_poll_index].fd) \
96	{ \
97	polls[so->so_poll_index].events \|= \
98	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
99	break; \
100	} \
101	AssertRelease(poll_index < (nfds)); \
102	polls[poll_index].fd = (so)->s; \
103	(so)->so_poll_index = poll_index; \
104	polls[poll_index].events = \
105	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
106	poll_index++; \
107	} while (0)
108
109	# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
110
111	/*
112	* DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
113	* gcc warns about attempts to log POLLNVAL so construction in a last to lines
114	* used to catch POLLNVAL while logging and return false in case of error while
115	* normal usage.
116	*/
117	# define DO_CHECK_FD_SET(so, events, fdset) \
118	( ((so)->so_poll_index != -1) \
119	&& ((so)->so_poll_index <= ndfs) \
120	&& ((so)->s == polls[so->so_poll_index].fd) \
121	&& (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
122	&& ( N_(fdset ## _poll) == POLLNVAL \
123	\|\| !(polls[(so)->so_poll_index].revents & POLLNVAL)))
124
125	/* specific for Windows Winsock API */
126	# define DO_WIN_CHECK_FD_SET(so, events, fdset) 0
127
128	# ifndef RT_OS_LINUX
129	# define readfds_poll (POLLRDNORM)
130	# define writefds_poll (POLLWRNORM)
131	# else
132	# define readfds_poll (POLLIN)
133	# define writefds_poll (POLLOUT)
134	# endif
135	# define xfds_poll (POLLPRI)
136	# define closefds_poll (POLLHUP)
137	# define rderr_poll (POLLERR)
138	# if 0 /* unused yet */
139	# define rdhup_poll (POLLHUP)
140	# define nval_poll (POLLNVAL)
141	# endif
142
143	# define ICMP_ENGAGE_EVENT(so, fdset) \
144	do { \
145	if (pData->icmp_socket.s != -1) \
146	DO_ENGAGE_EVENT1((so), fdset, ICMP); \
147	} while (0)
148
149	#else /* RT_OS_WINDOWS */
150
151	/*
152	* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
153	* So no call to WSAEventSelect necessary.
154	*/
155	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while (0)
156
157	/*
158	* On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
159	*/
160	# define DO_ENGAGE_EVENT1(so, fdset1, label) \
161	do { \
162	rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
163	if (rc == SOCKET_ERROR) \
164	{ \
165	/* This should not happen */ \
166	error = WSAGetLastError(); \
167	LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
168	error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
169	} \
170	} while (0); \
171	CONTINUE(label)
172
173	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
174	DO_ENGAGE_EVENT1((so), (fdset1), label)
175
176	# define DO_POLL_EVENTS(rc, error, so, events, label) \
177	(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
178	if ((rc) == SOCKET_ERROR) \
179	{ \
180	(error) = WSAGetLastError(); \
181	LogRel(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
182	LogFunc(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
183	CONTINUE(label); \
184	}
185
186	# define acceptds_win FD_ACCEPT
187	# define acceptds_win_bit FD_ACCEPT_BIT
188	# define readfds_win FD_READ
189	# define readfds_win_bit FD_READ_BIT
190	# define writefds_win FD_WRITE
191	# define writefds_win_bit FD_WRITE_BIT
192	# define xfds_win FD_OOB
193	# define xfds_win_bit FD_OOB_BIT
194	# define closefds_win FD_CLOSE
195	# define closefds_win_bit FD_CLOSE_BIT
196	# define connectfds_win FD_CONNECT
197	# define connectfds_win_bit FD_CONNECT_BIT
198
199	# define closefds_win FD_CLOSE
200	# define closefds_win_bit FD_CLOSE_BIT
201
202	# define DO_CHECK_FD_SET(so, events, fdset) \
203	((events).lNetworkEvents & fdset ## _win)
204
205	# define DO_WIN_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
206	# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /specific for Unix API /
207
208	#endif /* RT_OS_WINDOWS */
209
210	#define TCP_ENGAGE_EVENT1(so, fdset) \
211	DO_ENGAGE_EVENT1((so), fdset, tcp)
212
213	#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
214	DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
215
216	#ifdef RT_OS_WINDOWS
217	# define WIN_TCP_ENGAGE_EVENT2(so, fdset, fdset2) TCP_ENGAGE_EVENT2(so, fdset1, fdset2)
218	#endif
219
220	#define UDP_ENGAGE_EVENT(so, fdset) \
221	DO_ENGAGE_EVENT1((so), fdset, udp)
222
223	#define POLL_TCP_EVENTS(rc, error, so, events) \
224	DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
225
226	#define POLL_UDP_EVENTS(rc, error, so, events) \
227	DO_POLL_EVENTS((rc), (error), (so), (events), udp)
228
229	#define CHECK_FD_SET(so, events, set) \
230	(DO_CHECK_FD_SET((so), (events), set))
231
232	#define WIN_CHECK_FD_SET(so, events, set) \
233	(DO_WIN_CHECK_FD_SET((so), (events), set))
234
235	/*
236	* Loging macros
237	*/
238	#if VBOX_WITH_DEBUG_NAT_SOCKETS
239	# if defined(RT_OS_WINDOWS)
240	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
241	do { \
242	LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
243	} while (0)
244	# else /* !RT_OS_WINDOWS */
245	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
246	do { \
247	LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
248	CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
249	CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
250	CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
251	CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
252	CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
253	CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
254	} while (0)
255	# endif /* !RT_OS_WINDOWS */
256	#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
257	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
258	#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
259
260	#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
261	DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
262
263	static const uint8_t special_ethaddr[6] =
264	{
265	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
266	};
267
268	static const uint8_t broadcast_ethaddr[6] =
269	{
270	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
271	};
272
273	const uint8_t zerro_ethaddr[6] =
274	{
275	0x0, 0x0, 0x0, 0x0, 0x0, 0x0
276	};
277
278	/**
279	* This helper routine do the checks in descriptions to
280	* ''fUnderPolling'' and ''fShouldBeRemoved'' flags
281	* @returns 1 if socket removed and 0 if no changes was made.
282	*/
283	static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
284	{
285	AssertPtrReturn(pData, 0);
286	AssertPtrReturn(pSocket, 0);
287	AssertReturn(pSocket->fUnderPolling, 0);
288	if (pSocket->fShouldBeRemoved)
289	{
290	pSocket->fUnderPolling = 0;
291	sofree(pData, pSocket);
292	/* pSocket is PHANTOM, now */
293	return 1;
294	}
295	return 0;
296	}
297
298	int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
299	bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
300	int iIcmpCacheLimit, void *pvUser)
301	{
302	int rc;
303	PNATState pData;
304	if (u32Netmask & 0x1f)
305	{
306	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
307	LogRel(("NAT: The last 5 bits of the netmask (%RTnaipv4) need to be unset\n", RT_BE2H_U32(u32Netmask)));
308	return VERR_INVALID_PARAMETER;
309	}
310	pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
311	*ppData = pData;
312	if (!pData)
313	return VERR_NO_MEMORY;
314	pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
315	pData->fUseHostResolver = fUseHostResolver;
316	pData->fUseHostResolverPermanent = fUseHostResolver;
317	pData->pvUser = pvUser;
318	pData->netmask = u32Netmask;
319
320	rc = RTCritSectRwInit(&pData->CsRwHandlerChain);
321	if (RT_FAILURE(rc))
322	return rc;
323
324	/* sockets & TCP defaults */
325	pData->socket_rcv = 64 * _1K;
326	pData->socket_snd = 64 * _1K;
327	tcp_sndspace = 64 * _1K;
328	tcp_rcvspace = 64 * _1K;
329
330	/*
331	* Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
332	* to avoid release log noise.
333	*/
334	pData->soMaxConn = 10;
335
336	#ifdef RT_OS_WINDOWS
337	{
338	WSADATA Data;
339	RTLDRMOD hLdrMod;
340
341	WSAStartup(MAKEWORD(2, 0), &Data);
342
343	rc = RTLdrLoadSystem("Iphlpapi.dll", /* :fNoUnload */ true, &hLdrMod);
344	if (RT_SUCCESS(rc))
345	{
346	rc = RTLdrGetSymbol(hLdrMod, "GetAdaptersAddresses", (void **)&pData->pfGetAdaptersAddresses);
347	if (RT_FAILURE(rc))
348	LogRel(("NAT: Can't find GetAdapterAddresses in Iphlpapi.dll\n"));
349
350	RTLdrClose(hLdrMod);
351	}
352	}
353	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
354	#endif
355
356	rc = bootp_dhcp_init(pData);
357	if (RT_FAILURE(rc))
358	{
359	Log(("NAT: DHCP server initialization failed\n"));
360	RTMemFree(pData);
361	*ppData = NULL;
362	return rc;
363	}
364	debug_init(pData);
365	if_init(pData);
366	ip_init(pData);
367	icmp_init(pData, iIcmpCacheLimit);
368
369	/* Initialise mbufs after setting the MTU */
370	mbuf_init(pData);
371
372	pData->special_addr.s_addr = u32NetAddr;
373	pData->slirp_ethaddr = &special_ethaddr[0];
374	alias_addr.s_addr = pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_ALIAS);
375	/* @todo: add ability to configure this staff */
376
377	/* set default addresses */
378	inet_aton("127.0.0.1", &loopback_addr);
379
380	rc = slirpTftpInit(pData);
381	AssertRCReturn(rc, VINF_NAT_DNS);
382
383	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
384	{
385	Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
386	i32AliasMode = 0;
387	}
388	pData->i32AliasMode = i32AliasMode;
389	getouraddr(pData);
390	{
391	int flags = 0;
392	struct in_addr proxy_addr;
393	pData->proxy_alias = LibAliasInit(pData, NULL);
394	if (pData->proxy_alias == NULL)
395	{
396	Log(("NAT: LibAlias default rule wasn't initialized\n"));
397	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
398	}
399	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
400	#ifndef NO_FW_PUNCH
401	flags \|= PKT_ALIAS_PUNCH_FW;
402	#endif
403	flags \|= pData->i32AliasMode; /* do transparent proxying */
404	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
405	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
406	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
407	ftp_alias_load(pData);
408	nbt_alias_load(pData);
409	if (pData->fUseHostResolver)
410	dns_alias_load(pData);
411	}
412	#ifdef VBOX_WITH_NAT_SEND2HOME
413	/* @todo: we should know all interfaces available on host. */
414	pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
415	pData->cInHomeAddressSize = 1;
416	inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
417	pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
418	# ifdef RT_OS_DARWIN
419	pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
420	# endif
421	#endif
422
423	slirp_link_up(pData);
424	return VINF_SUCCESS;
425	}
426
427	/**
428	* Register statistics.
429	*/
430	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
431	{
432	#ifdef VBOX_WITH_STATISTICS
433	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
434	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
435	# include "counters.h"
436	# undef COUNTER
437	/** @todo register statistics for the variables dumped by:
438	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
439	* mbufstats(pData); sockstats(pData); */
440	#else /* VBOX_WITH_STATISTICS */
441	NOREF(pData);
442	NOREF(pDrvIns);
443	#endif /* !VBOX_WITH_STATISTICS */
444	}
445
446	/**
447	* Deregister statistics.
448	*/
449	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
450	{
451	if (pData == NULL)
452	return;
453	#ifdef VBOX_WITH_STATISTICS
454	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
455	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
456	# include "counters.h"
457	#else /* VBOX_WITH_STATISTICS */
458	NOREF(pData);
459	NOREF(pDrvIns);
460	#endif /* !VBOX_WITH_STATISTICS */
461	}
462
463	/**
464	* Marks the link as up, making it possible to establish new connections.
465	*/
466	void slirp_link_up(PNATState pData)
467	{
468	struct arp_cache_entry *ac;
469
470	if (link_up == 1)
471	return;
472
473	link_up = 1;
474
475	if (!pData->fUseHostResolverPermanent)
476	slirpInitializeDnsSettings(pData);
477	}
478
479	/**
480	* Marks the link as down and cleans up the current connections.
481	*/
482	void slirp_link_down(PNATState pData)
483	{
484	struct port_forward_rule *rule;
485
486	if (link_up == 0)
487	return;
488
489	slirpReleaseDnsSettings(pData);
490
491	link_up = 0;
492	}
493
494	/**
495	* Terminates the slirp component.
496	*/
497	void slirp_term(PNATState pData)
498	{
499	struct socket *so;
500
501	if (pData == NULL)
502	return;
503
504	icmp_finit(pData);
505
506	while ((so = tcb.so_next) != &tcb)
507	{
508	/* Don't miss TCB releasing */
509	if ( !sototcpcb(so)
510	&& ( so->so_state & SS_NOFDREF
511	\|\| so->s == -1))
512	sofree(pData, so);
513	else
514	tcp_close(pData, sototcpcb(so));
515	}
516
517	while ((so = udb.so_next) != &udb)
518	udp_detach(pData, so);
519
520	slirp_link_down(pData);
521	ftp_alias_unload(pData);
522	nbt_alias_unload(pData);
523	if (pData->fUseHostResolver)
524	{
525	dns_alias_unload(pData);
526	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
527	while (!LIST_EMPTY(&pData->DNSMapHead))
528	{
529	PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
530	LIST_REMOVE(pDnsEntry, MapList);
531	RTStrFree(pDnsEntry->pszCName);
532	RTMemFree(pDnsEntry);
533	}
534	#endif
535	}
536	while (!LIST_EMPTY(&instancehead))
537	{
538	struct libalias *la = LIST_FIRST(&instancehead);
539	/* libalias do all clean up */
540	LibAliasUninit(la);
541	}
542	while (!LIST_EMPTY(&pData->arp_cache))
543	{
544	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
545	LIST_REMOVE(ac, list);
546	RTMemFree(ac);
547	}
548	slirpTftpTerm(pData);
549	bootp_dhcp_fini(pData);
550	m_fini(pData);
551	#ifdef RT_OS_WINDOWS
552	WSACleanup();
553	#endif
554	#ifdef LOG_ENABLED
555	Log(("\n"
556	"NAT statistics\n"
557	"--------------\n"
558	"\n"));
559	ipstats(pData);
560	tcpstats(pData);
561	udpstats(pData);
562	icmpstats(pData);
563	mbufstats(pData);
564	sockstats(pData);
565	Log(("\n"
566	"\n"
567	"\n"));
568	#endif
569	RTCritSectRwDelete(&pData->CsRwHandlerChain);
570	RTMemFree(pData);
571	}
572
573
574	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
575	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
576
577	/*
578	* curtime kept to an accuracy of 1ms
579	*/
580	static void updtime(PNATState pData)
581	{
582	#ifdef RT_OS_WINDOWS
583	struct _timeb tb;
584
585	_ftime(&tb);
586	curtime = (u_int)tb.time * (u_int)1000;
587	curtime += (u_int)tb.millitm;
588	#else
589	gettimeofday(&tt, 0);
590
591	curtime = (u_int)tt.tv_sec * (u_int)1000;
592	curtime += (u_int)tt.tv_usec / (u_int)1000;
593
594	if ((tt.tv_usec % 1000) >= 500)
595	curtime++;
596	#endif
597	}
598
599	#ifdef RT_OS_WINDOWS
600	void slirp_select_fill(PNATState pData, int *pnfds)
601	#else /* RT_OS_WINDOWS */
602	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
603	#endif /* !RT_OS_WINDOWS */
604	{
605	struct socket so, so_next;
606	int nfds;
607	#if defined(RT_OS_WINDOWS)
608	int rc;
609	int error;
610	#else
611	int poll_index = 0;
612	#endif
613	int i;
614
615	STAM_PROFILE_START(&pData->StatFill, a);
616
617	nfds = *pnfds;
618
619	/*
620	* First, TCP sockets
621	*/
622	do_slowtimo = 0;
623	if (!link_up)
624	goto done;
625
626	/*
627	* *_slowtimo needs calling if there are IP fragments
628	* in the fragment queue, or there are TCP connections active
629	*/
630	/* XXX:
631	* triggering of fragment expiration should be the same but use new macroses
632	*/
633	do_slowtimo = (tcb.so_next != &tcb);
634	if (!do_slowtimo)
635	{
636	for (i = 0; i < IPREASS_NHASH; i++)
637	{
638	if (!TAILQ_EMPTY(&ipq[i]))
639	{
640	do_slowtimo = 1;
641	break;
642	}
643	}
644	}
645	/* always add the ICMP socket */
646	#ifndef RT_OS_WINDOWS
647	pData->icmp_socket.so_poll_index = -1;
648	#endif
649	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
650
651	STAM_COUNTER_RESET(&pData->StatTCP);
652	STAM_COUNTER_RESET(&pData->StatTCPHot);
653
654	QSOCKET_FOREACH(so, so_next, tcp)
655	/* { */
656	Assert(so->so_type == IPPROTO_TCP);
657	#if !defined(RT_OS_WINDOWS)
658	so->so_poll_index = -1;
659	#endif
660	STAM_COUNTER_INC(&pData->StatTCP);
661	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
662	/* TCP socket can't be cloned */
663	Assert((!so->so_cloneOf));
664	#endif
665	/*
666	* See if we need a tcp_fasttimo
667	*/
668	if ( time_fasttimo == 0
669	&& so->so_tcpcb != NULL
670	&& so->so_tcpcb->t_flags & TF_DELACK)
671	{
672	time_fasttimo = curtime; /* Flag when we want a fasttimo */
673	}
674
675	/*
676	* NOFDREF can include still connecting to local-host,
677	* newly socreated() sockets etc. Don't want to select these.
678	*/
679	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
680	CONTINUE(tcp);
681
682	/*
683	* Set for reading sockets which are accepting
684	*/
685	if (so->so_state & SS_FACCEPTCONN)
686	{
687	STAM_COUNTER_INC(&pData->StatTCPHot);
688	TCP_ENGAGE_EVENT1(so, readfds);
689	CONTINUE(tcp);
690	}
691
692	/*
693	* Set for writing sockets which are connecting
694	*/
695	if (so->so_state & SS_ISFCONNECTING)
696	{
697	Log2(("connecting %R[natsock] engaged\n",so));
698	STAM_COUNTER_INC(&pData->StatTCPHot);
699	#ifdef RT_OS_WINDOWS
700	WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
701	#else
702	TCP_ENGAGE_EVENT1(so, writefds);
703	#endif
704	}
705
706	/*
707	* Set for writing if we are connected, can send more, and
708	* we have something to send
709	*/
710	if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
711	{
712	STAM_COUNTER_INC(&pData->StatTCPHot);
713	TCP_ENGAGE_EVENT1(so, writefds);
714	}
715
716	/*
717	* Set for reading (and urgent data) if we are connected, can
718	* receive more, and we have room for it XXX /2 ?
719	*/
720	/* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
721	if ( CONN_CANFRCV(so)
722	&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
723	#ifdef RT_OS_WINDOWS
724	&& !(so->so_state & SS_ISFCONNECTING)
725	#endif
726	)
727	{
728	STAM_COUNTER_INC(&pData->StatTCPHot);
729	TCP_ENGAGE_EVENT2(so, readfds, xfds);
730	}
731	LOOP_LABEL(tcp, so, so_next);
732	}
733
734	/*
735	* UDP sockets
736	*/
737	STAM_COUNTER_RESET(&pData->StatUDP);
738	STAM_COUNTER_RESET(&pData->StatUDPHot);
739
740	QSOCKET_FOREACH(so, so_next, udp)
741	/* { */
742
743	Assert(so->so_type == IPPROTO_UDP);
744	STAM_COUNTER_INC(&pData->StatUDP);
745	#if !defined(RT_OS_WINDOWS)
746	so->so_poll_index = -1;
747	#endif
748
749	/*
750	* See if it's timed out
751	*/
752	if (so->so_expire)
753	{
754	if (so->so_expire <= curtime)
755	{
756	Log2(("NAT: %R[natsock] expired\n", so));
757	if (so->so_timeout != NULL)
758	{
759	/* so_timeout - might change the so_expire value or
760	* drop so_timeout* from so.
761	*/
762	so->so_timeout(pData, so, so->so_timeout_arg);
763	/* on 4.2 so->
764	*/
765	if ( so_next->so_prev != so /* so_timeout freed the socket */
766	\|\| so->so_timeout) /* so_timeout just freed so_timeout */
767	CONTINUE_NO_UNLOCK(udp);
768	}
769	UDP_DETACH(pData, so, so_next);
770	CONTINUE_NO_UNLOCK(udp);
771	}
772	}
773	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
774	if (so->so_cloneOf)
775	CONTINUE_NO_UNLOCK(udp);
776	#endif
777
778	/*
779	* When UDP packets are received from over the link, they're
780	* sendto()'d straight away, so no need for setting for writing
781	* Limit the number of packets queued by this session to 4.
782	* Note that even though we try and limit this to 4 packets,
783	* the session could have more queued if the packets needed
784	* to be fragmented.
785	*
786	* (XXX <= 4 ?)
787	*/
788	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
789	{
790	STAM_COUNTER_INC(&pData->StatUDPHot);
791	UDP_ENGAGE_EVENT(so, readfds);
792	}
793	LOOP_LABEL(udp, so, so_next);
794	}
795	done:
796
797	#if defined(RT_OS_WINDOWS)
798	*pnfds = VBOX_EVENT_COUNT;
799	#else /* RT_OS_WINDOWS */
800	AssertRelease(poll_index <= *pnfds);
801	*pnfds = poll_index;
802	#endif /* !RT_OS_WINDOWS */
803
804	STAM_PROFILE_STOP(&pData->StatFill, a);
805	}
806
807
808	/**
809	* This function do Connection or sending tcp sequence to.
810	* @returns if true operation completed
811	* @note: functions call tcp_input that potentially could lead to tcp_drop
812	*/
813	static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
814	{
815	int ret;
816	LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
817	/*
818	* Check for non-blocking, still-connecting sockets
819	*/
820	if (so->so_state & SS_ISFCONNECTING)
821	{
822	Log2(("connecting %R[natsock] catched\n", so));
823	/* Connected */
824	so->so_state &= ~SS_ISFCONNECTING;
825
826	/*
827	* This should be probably guarded by PROBE_CONN too. Anyway,
828	* we disable it on OS/2 because the below send call returns
829	* EFAULT which causes the opened TCP socket to close right
830	* after it has been opened and connected.
831	*/
832	#ifndef RT_OS_OS2
833	ret = send(so->s, (const char *)&ret, 0, 0);
834	if (ret < 0)
835	{
836	/* XXXXX Must fix, zero bytes is a NOP */
837	if ( soIgnorableErrorCode(errno)
838	\|\| errno == ENOTCONN)
839	{
840	LogFlowFunc(("LEAVE: false\n"));
841	return false;
842	}
843
844	/* else failed */
845	so->so_state = SS_NOFDREF;
846	}
847	/* else so->so_state &= ~SS_ISFCONNECTING; */
848	#endif
849
850	/*
851	* Continue tcp_input
852	*/
853	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
854	/* continue; */
855	}
856	else if (!fConnectOnly)
857	{
858	SOWRITE(ret, pData, so);
859	if (RT_LIKELY(ret > 0))
860	{
861	/*
862	* Make sure we will send window update to peer. This is
863	* a moral equivalent of calling tcp_output() for PRU_RCVD
864	* in tcp_usrreq() of the real stack.
865	*/
866	struct tcpcb *tp = sototcpcb(so);
867	if (RT_LIKELY(tp != NULL))
868	tp->t_flags \|= TF_DELACK;
869	}
870	}
871
872	LogFlowFunc(("LEAVE: true\n"));
873	return true;
874	}
875
876	#if defined(RT_OS_WINDOWS)
877	void slirp_select_poll(PNATState pData, int fTimeout)
878	#else /* RT_OS_WINDOWS */
879	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
880	#endif /* !RT_OS_WINDOWS */
881	{
882	struct socket so, so_next;
883	int ret;
884	#if defined(RT_OS_WINDOWS)
885	WSANETWORKEVENTS NetworkEvents;
886	int rc;
887	int error;
888	#endif
889
890	STAM_PROFILE_START(&pData->StatPoll, a);
891
892	/* Update time */
893	updtime(pData);
894
895	/*
896	* See if anything has timed out
897	*/
898	if (link_up)
899	{
900	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
901	{
902	STAM_PROFILE_START(&pData->StatFastTimer, b);
903	tcp_fasttimo(pData);
904	time_fasttimo = 0;
905	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
906	}
907	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
908	{
909	STAM_PROFILE_START(&pData->StatSlowTimer, c);
910	ip_slowtimo(pData);
911	tcp_slowtimo(pData);
912	last_slowtimo = curtime;
913	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
914	}
915	}
916	#if defined(RT_OS_WINDOWS)
917	if (fTimeout)
918	return; /* only timer update */
919	#endif
920
921	/*
922	* Check sockets
923	*/
924	if (!link_up)
925	goto done;
926	#if defined(RT_OS_WINDOWS)
927	icmpwin_process(pData);
928	#else
929	if ( (pData->icmp_socket.s != -1)
930	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
931	sorecvfrom(pData, &pData->icmp_socket);
932	#endif
933	/*
934	* Check TCP sockets
935	*/
936	QSOCKET_FOREACH(so, so_next, tcp)
937	/* { */
938	/* TCP socket can't be cloned */
939	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
940	Assert((!so->so_cloneOf));
941	#endif
942	Assert(!so->fUnderPolling);
943	so->fUnderPolling = 1;
944	if (slirpVerifyAndFreeSocket(pData, so))
945	CONTINUE(tcp);
946	/*
947	* FD_ISSET is meaningless on these sockets
948	* (and they can crash the program)
949	*/
950	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
951	{
952	so->fUnderPolling = 0;
953	CONTINUE(tcp);
954	}
955
956	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
957
958	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
959
960	if (so->so_state & SS_ISFCONNECTING)
961	{
962	int sockerr = 0;
963	#if !defined(RT_OS_WINDOWS)
964	{
965	int revents = 0;
966
967	/*
968	* Failed connect(2) is reported by poll(2) on
969	* different OSes with different combinations of
970	* POLLERR, POLLHUP, and POLLOUT.
971	*/
972	if ( CHECK_FD_SET(so, NetworkEvents, closefds) /* POLLHUP */
973	\|\| CHECK_FD_SET(so, NetworkEvents, rderr)) /* POLLERR */
974	{
975	revents = POLLHUP; /* squash to single "failed" flag */
976	}
977	#if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_NETBSD)
978	/* Solaris and NetBSD report plain POLLOUT even on error */
979	else if (CHECK_FD_SET(so, NetworkEvents, writefds)) /* POLLOUT */
980	{
981	revents = POLLOUT;
982	}
983	#endif
984
985	if (revents != 0)
986	{
987	socklen_t optlen = (socklen_t)sizeof(sockerr);
988	ret = getsockopt(so->s, SOL_SOCKET, SO_ERROR, &sockerr, &optlen);
989
990	if ( RT_UNLIKELY(ret < 0)
991	\|\| ( (revents & POLLHUP)
992	&& RT_UNLIKELY(sockerr == 0)))
993	sockerr = ETIMEDOUT;
994	}
995	}
996	#else /* RT_OS_WINDOWS */
997	{
998	if (NetworkEvents.lNetworkEvents & FD_CONNECT)
999	sockerr = NetworkEvents.iErrorCode[FD_CONNECT_BIT];
1000	}
1001	#endif
1002	if (sockerr != 0)
1003	{
1004	tcp_fconnect_failed(pData, so, sockerr);
1005	ret = slirpVerifyAndFreeSocket(pData, so);
1006	Assert(ret == 1); /* freed */
1007	CONTINUE(tcp);
1008	}
1009
1010	/*
1011	* XXX: For now just fall through to the old code to
1012	* handle successful connect(2).
1013	*/
1014	}
1015
1016	/*
1017	* Check for URG data
1018	* This will soread as well, so no need to
1019	* test for readfds below if this succeeds
1020	*/
1021
1022	/* out-of-band data */
1023	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
1024	#ifdef RT_OS_DARWIN
1025	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
1026	* combination on other Unixs hosts doesn't enter to this branch
1027	*/
1028	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
1029	#endif
1030	#ifdef RT_OS_WINDOWS
1031	/**
1032	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
1033	*/
1034	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
1035	#endif
1036	)
1037	{
1038	sorecvoob(pData, so);
1039	if (slirpVerifyAndFreeSocket(pData, so))
1040	CONTINUE(tcp);
1041	}
1042
1043	/*
1044	* Check sockets for reading
1045	*/
1046	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
1047	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
1048	{
1049
1050	#ifdef RT_OS_WINDOWS
1051	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
1052	{
1053	/* Finish connection first */
1054	/* should we ignore return value? */
1055	bool fRet = slirpConnectOrWrite(pData, so, true);
1056	LogFunc(("fRet:%RTbool\n", fRet));
1057	if (slirpVerifyAndFreeSocket(pData, so))
1058	CONTINUE(tcp);
1059	}
1060	#endif
1061	/*
1062	* Check for incoming connections
1063	*/
1064	if (so->so_state & SS_FACCEPTCONN)
1065	{
1066	TCP_CONNECT(pData, so);
1067	if (slirpVerifyAndFreeSocket(pData, so))
1068	CONTINUE(tcp);
1069	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
1070	{
1071	so->fUnderPolling = 0;
1072	CONTINUE(tcp);
1073	}
1074	}
1075
1076	ret = soread(pData, so);
1077	if (slirpVerifyAndFreeSocket(pData, so))
1078	CONTINUE(tcp);
1079	/* Output it if we read something */
1080	if (RT_LIKELY(ret > 0))
1081	TCP_OUTPUT(pData, sototcpcb(so));
1082
1083	if (slirpVerifyAndFreeSocket(pData, so))
1084	CONTINUE(tcp);
1085	}
1086
1087	/*
1088	* Check for FD_CLOSE events.
1089	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1090	*/
1091	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1092	\|\| (so->so_close == 1))
1093	{
1094	/*
1095	* drain the socket
1096	*/
1097	for (; so_next->so_prev == so
1098	&& !slirpVerifyAndFreeSocket(pData, so);)
1099	{
1100	ret = soread(pData, so);
1101	if (slirpVerifyAndFreeSocket(pData, so))
1102	break;
1103
1104	if (ret > 0)
1105	TCP_OUTPUT(pData, sototcpcb(so));
1106	else if (so_next->so_prev == so)
1107	{
1108	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1109	break;
1110	}
1111	}
1112
1113	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1114	if (so_next->so_prev == so)
1115	{
1116	/* mark the socket for termination _after_ it was drained */
1117	so->so_close = 1;
1118	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1119	* Actually in the specific error scenario, POLLERR is set as well. */
1120	#ifndef RT_OS_WINDOWS
1121	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1122	sofcantsendmore(so);
1123	#endif
1124	}
1125	if (so_next->so_prev == so)
1126	so->fUnderPolling = 0;
1127	CONTINUE(tcp);
1128	}
1129
1130	/*
1131	* Check sockets for writing
1132	*/
1133	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1134	#ifdef RT_OS_WINDOWS
1135	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1136	#endif
1137	)
1138	{
1139	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1140	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1141	* so we should be ready to such situations.
1142	*/
1143	if (slirpVerifyAndFreeSocket(pData, so))
1144	CONTINUE(tcp);
1145	else if (!fConnectOrWriteSuccess)
1146	{
1147	so->fUnderPolling = 0;
1148	CONTINUE(tcp);
1149	}
1150	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1151	}
1152
1153	/*
1154	* Probe a still-connecting, non-blocking socket
1155	* to check if it's still alive
1156	*/
1157	#ifdef PROBE_CONN
1158	if (so->so_state & SS_ISFCONNECTING)
1159	{
1160	ret = recv(so->s, (char *)&ret, 0, 0);
1161
1162	if (ret < 0)
1163	{
1164	/* XXX */
1165	if ( soIgnorableErrorCode(errno)
1166	\|\| errno == ENOTCONN)
1167	{
1168	CONTINUE(tcp); /* Still connecting, continue */
1169	}
1170
1171	/* else failed */
1172	so->so_state = SS_NOFDREF;
1173
1174	/* tcp_input will take care of it */
1175	}
1176	else
1177	{
1178	ret = send(so->s, &ret, 0, 0);
1179	if (ret < 0)
1180	{
1181	/* XXX */
1182	if ( soIgnorableErrorCode(errno)
1183	\|\| errno == ENOTCONN)
1184	{
1185	CONTINUE(tcp);
1186	}
1187	/* else failed */
1188	so->so_state = SS_NOFDREF;
1189	}
1190	else
1191	so->so_state &= ~SS_ISFCONNECTING;
1192
1193	}
1194	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1195	} /* SS_ISFCONNECTING */
1196	#endif
1197	if (!slirpVerifyAndFreeSocket(pData, so))
1198	so->fUnderPolling = 0;
1199	LOOP_LABEL(tcp, so, so_next);
1200	}
1201
1202	/*
1203	* Now UDP sockets.
1204	* Incoming packets are sent straight away, they're not buffered.
1205	* Incoming UDP data isn't buffered either.
1206	*/
1207	QSOCKET_FOREACH(so, so_next, udp)
1208	/* { */
1209	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1210	if (so->so_cloneOf)
1211	CONTINUE_NO_UNLOCK(udp);
1212	#endif
1213	#if 0
1214	so->fUnderPolling = 1;
1215	if(slirpVerifyAndFreeSocket(pData, so));
1216	CONTINUE(udp);
1217	so->fUnderPolling = 0;
1218	#endif
1219
1220	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1221
1222	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1223
1224	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1225	{
1226	SORECVFROM(pData, so);
1227	}
1228	LOOP_LABEL(udp, so, so_next);
1229	}
1230
1231	done:
1232
1233	STAM_PROFILE_STOP(&pData->StatPoll, a);
1234	}
1235
1236
1237	struct arphdr
1238	{
1239	unsigned short ar_hrd; /* format of hardware address */
1240	unsigned short ar_pro; /* format of protocol address */
1241	unsigned char ar_hln; /* length of hardware address */
1242	unsigned char ar_pln; /* length of protocol address */
1243	unsigned short ar_op; /* ARP opcode (command) */
1244
1245	/*
1246	* Ethernet looks like this : This bit is variable sized however...
1247	*/
1248	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1249	unsigned char ar_sip[4]; /* sender IP address */
1250	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1251	unsigned char ar_tip[4]; /* target IP address */
1252	};
1253	AssertCompileSize(struct arphdr, 28);
1254
1255	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1256	{
1257	struct ethhdr *pEtherHeaderResponse;
1258	struct arphdr *pARPHeaderResponse;
1259	uint32_t ip4TargetAddressInHostFormat;
1260	struct mbuf *pMbufResponse;
1261
1262	Assert((pcu8EtherSource));
1263	if (!pcu8EtherSource)
1264	return;
1265	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1266
1267	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1268	if (!pMbufResponse)
1269	return;
1270	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1271	/* @note: if_encap will swap src and dst*/
1272	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1273	pMbufResponse->m_data += ETH_HLEN;
1274	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1275	pMbufResponse->m_len = sizeof(struct arphdr);
1276
1277	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1278	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1279	pARPHeaderResponse->ar_hln = ETH_ALEN;
1280	pARPHeaderResponse->ar_pln = 4;
1281	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1282	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1283
1284	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1285	{
1286	static bool fTagErrorReported;
1287	if (!fTagErrorReported)
1288	{
1289	LogRel(("NAT: Couldn't add the tag(PACKET_SERVICE:%d)\n",
1290	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1291	fTagErrorReported = true;
1292	}
1293	}
1294	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1295
1296	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1297	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1298	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1299	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1300	}
1301
1302	/**
1303	* @note This function will free m!
1304	*/
1305	static void arp_input(PNATState pData, struct mbuf *m)
1306	{
1307	struct ethhdr *pEtherHeader;
1308	struct arphdr *pARPHeader;
1309	uint32_t ip4TargetAddress;
1310
1311	int ar_op;
1312	pEtherHeader = mtod(m, struct ethhdr *);
1313	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1314
1315	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1316	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1317
1318	switch (ar_op)
1319	{
1320	case ARPOP_REQUEST:
1321	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1322	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1323	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1324	{
1325	slirp_update_guest_addr_guess(pData, (uint32_t )pARPHeader->ar_sip, "arp request");
1326	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1327	break;
1328	}
1329
1330	/* Gratuitous ARP */
1331	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1332	&& ( memcmp(pARPHeader->ar_tha, zerro_ethaddr, ETH_ALEN) == 0
1333	\|\| memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0)
1334	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1335	{
1336	LogRel2(("NAT: Gratuitous ARP from %RTnaipv4 at %RTmac\n",
1337	(uint32_t )pARPHeader->ar_sip, pARPHeader->ar_sha));
1338	slirp_update_guest_addr_guess(pData, (uint32_t )pARPHeader->ar_sip, "gratuitous arp");
1339	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1340	}
1341	break;
1342
1343	case ARPOP_REPLY:
1344	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1345	break;
1346
1347	default:
1348	break;
1349	}
1350
1351	m_freem(pData, m);
1352	}
1353
1354	/**
1355	* Feed a packet into the slirp engine.
1356	*
1357	* @param m Data buffer, m_len is not valid.
1358	* @param cbBuf The length of the data in m.
1359	*/
1360	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1361	{
1362	int proto;
1363	static bool fWarnedIpv6;
1364	struct ethhdr *eh;
1365	uint8_t au8Ether[ETH_ALEN];
1366
1367	m->m_len = cbBuf;
1368	if (cbBuf < ETH_HLEN)
1369	{
1370	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1371	m_freem(pData, m);
1372	return;
1373	}
1374	eh = mtod(m, struct ethhdr *);
1375	proto = RT_N2H_U16(eh->h_proto);
1376
1377	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1378
1379	switch(proto)
1380	{
1381	case ETH_P_ARP:
1382	arp_input(pData, m);
1383	break;
1384
1385	case ETH_P_IP:
1386	/* Update time. Important if the network is very quiet, as otherwise
1387	* the first outgoing connection gets an incorrect timestamp. */
1388	updtime(pData);
1389	m_adj(m, ETH_HLEN);
1390	M_ASSERTPKTHDR(m);
1391	m->m_pkthdr.header = mtod(m, void *);
1392	ip_input(pData, m);
1393	break;
1394
1395	case ETH_P_IPV6:
1396	m_freem(pData, m);
1397	if (!fWarnedIpv6)
1398	{
1399	LogRel(("NAT: IPv6 not supported\n"));
1400	fWarnedIpv6 = true;
1401	}
1402	break;
1403
1404	default:
1405	Log(("NAT: Unsupported protocol %x\n", proto));
1406	m_freem(pData, m);
1407	break;
1408	}
1409	}
1410
1411	/**
1412	* Output the IP packet to the ethernet device.
1413	*
1414	* @note This function will free m!
1415	*/
1416	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1417	{
1418	struct ethhdr *eh;
1419	uint8_t *mbuf = NULL;
1420	size_t mlen = 0;
1421	STAM_PROFILE_START(&pData->StatIF_encap, a);
1422	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1423	pData, eth_proto, m, flags));
1424
1425	M_ASSERTPKTHDR(m);
1426
1427	Assert(M_LEADINGSPACE(m) >= ETH_HLEN);
1428	m->m_data -= ETH_HLEN;
1429	m->m_len += ETH_HLEN;
1430	eh = mtod(m, struct ethhdr *);
1431	mlen = m->m_len;
1432
1433	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1434	{
1435	struct m_tag *t = m_tag_first(m);
1436	uint8_t u8ServiceId = CTL_ALIAS;
1437	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1438	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1439	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1440	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1441	{
1442	/* don't do anything */
1443	m_freem(pData, m);
1444	goto done;
1445	}
1446	if ( t
1447	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1448	{
1449	Assert(t);
1450	u8ServiceId = (uint8_t )&t[1];
1451	}
1452	eh->h_source[5] = u8ServiceId;
1453	}
1454	/*
1455	* we're processing the chain, that isn't not expected.
1456	*/
1457	Assert((!m->m_next));
1458	if (m->m_next)
1459	{
1460	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1461	m_freem(pData, m);
1462	goto done;
1463	}
1464	mbuf = mtod(m, uint8_t *);
1465	eh->h_proto = RT_H2N_U16(eth_proto);
1466	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1467	if (flags & ETH_ENCAP_URG)
1468	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1469	else
1470	slirp_output(pData->pvUser, m, mbuf, mlen);
1471	done:
1472	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1473	LogFlowFuncLeave();
1474	}
1475
1476
1477	void
1478	slirp_update_guest_addr_guess(PNATState pData, uint32_t guess, const char *msg)
1479	{
1480	Assert(msg != NULL);
1481
1482	if (pData->guest_addr_guess.s_addr == guess)
1483	{
1484	LogRel2(("NAT: Guest address guess %RTnaipv4 re-confirmed by %s\n",
1485	pData->guest_addr_guess.s_addr, msg));
1486	return;
1487	}
1488
1489	if (pData->guest_addr_guess.s_addr == INADDR_ANY)
1490	{
1491	pData->guest_addr_guess.s_addr = guess;
1492	LogRel(("NAT: Guest address guess set to %RTnaipv4 by %s\n",
1493	pData->guest_addr_guess.s_addr, msg));
1494	return;
1495	}
1496	else
1497	{
1498	LogRel(("NAT: Guest address guess changed from %RTnaipv4 to %RTnaipv4 by %s\n",
1499	pData->guest_addr_guess.s_addr, guess, msg));
1500	pData->guest_addr_guess.s_addr = guess;
1501	return;
1502	}
1503	}
1504
1505
1506	static struct port_forward_rule *
1507	slirp_find_redirect(PNATState pData,
1508	int is_udp,
1509	struct in_addr host_addr, int host_port,
1510	struct in_addr guest_addr, int guest_port)
1511	{
1512	struct port_forward_rule *rule;
1513	uint16_t proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1514
1515	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1516	{
1517	if ( rule->proto == proto
1518	&& rule->host_port == host_port
1519	&& rule->bind_ip.s_addr == host_addr.s_addr
1520	&& rule->guest_port == guest_port
1521	&& rule->guest_addr.s_addr == guest_addr.s_addr)
1522	{
1523	return rule;
1524	}
1525	}
1526
1527	return NULL;
1528	}
1529
1530
1531	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1532	struct in_addr guest_addr, int guest_port)
1533	{
1534	struct port_forward_rule *rule;
1535
1536	rule = slirp_find_redirect(pData, is_udp, host_addr, host_port, guest_addr, guest_port);
1537	if (rule != NULL) /* rule has been already registered */
1538	{
1539	/* XXX: this shouldn't happen */
1540	return 0;
1541	}
1542
1543	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1544	if (rule == NULL)
1545	return 1;
1546
1547	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1548	rule->bind_ip.s_addr = host_addr.s_addr;
1549	rule->host_port = host_port;
1550	rule->guest_addr.s_addr = guest_addr.s_addr;
1551	rule->guest_port = guest_port;
1552
1553	if (rule->proto == IPPROTO_UDP)
1554	rule->so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port),
1555	rule->guest_addr.s_addr, RT_H2N_U16(rule->guest_port), 0);
1556	else
1557	rule->so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port),
1558	rule->guest_addr.s_addr, RT_H2N_U16(rule->guest_port), 0);
1559
1560	if (rule->so == NULL)
1561	{
1562	LogRel(("NAT: Failed to redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1563	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1564	rule->bind_ip.s_addr, rule->host_port,
1565	guest_addr, rule->guest_port));
1566	RTMemFree(rule);
1567	return 1;
1568	}
1569
1570	LogRel(("NAT: Set redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1571	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1572	rule->bind_ip.s_addr, rule->host_port,
1573	guest_addr, rule->guest_port));
1574
1575	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1576	return 0;
1577	}
1578
1579
1580	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1581	struct in_addr guest_addr, int guest_port)
1582	{
1583	struct port_forward_rule *rule;
1584
1585	rule = slirp_find_redirect(pData, is_udp, host_addr, host_port, guest_addr, guest_port);
1586	if (rule == NULL)
1587	{
1588	LogRel(("NAT: Unable to find redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1589	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1590	rule->bind_ip.s_addr, rule->host_port,
1591	guest_addr.s_addr, rule->guest_port));
1592	return 0;
1593	}
1594
1595	LogRel(("NAT: Remove redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1596	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1597	rule->bind_ip.s_addr, rule->host_port,
1598	guest_addr.s_addr, rule->guest_port));
1599
1600	if (rule->so != NULL)
1601	{
1602	if (is_udp)
1603	udp_detach(pData, rule->so);
1604	else
1605	tcp_close(pData, sototcpcb(rule->so));
1606	}
1607
1608	LIST_REMOVE(rule, list);
1609	RTMemFree(rule);
1610	return 0;
1611	}
1612
1613
1614	#if defined(RT_OS_WINDOWS)
1615	HANDLE *slirp_get_events(PNATState pData)
1616	{
1617	return pData->phEvents;
1618	}
1619	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1620	{
1621	pData->phEvents[index] = hEvent;
1622	}
1623	#endif
1624
1625	unsigned int slirp_get_timeout_ms(PNATState pData)
1626	{
1627	if (link_up)
1628	{
1629	if (time_fasttimo)
1630	return 2;
1631	if (do_slowtimo)
1632	return 500; /* see PR_SLOWHZ */
1633	}
1634	return 36001000; / one hour */
1635	}
1636
1637	#ifndef RT_OS_WINDOWS
1638	int slirp_get_nsock(PNATState pData)
1639	{
1640	return pData->nsock;
1641	}
1642	#endif
1643
1644	/*
1645	* this function called from NAT thread
1646	*/
1647	void slirp_post_sent(PNATState pData, void *pvArg)
1648	{
1649	struct mbuf m = (struct mbuf )pvArg;
1650	m_freem(pData, m);
1651	}
1652
1653	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1654	{
1655	Log2(("tftp_prefix: %s\n", tftpPrefix));
1656	tftp_prefix = tftpPrefix;
1657	}
1658
1659	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1660	{
1661	Log2(("bootFile: %s\n", bootFile));
1662	bootp_filename = bootFile;
1663	}
1664
1665	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1666	{
1667	Log2(("next_server: %s\n", next_server));
1668	if (next_server == NULL)
1669	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1670	else
1671	inet_aton(next_server, &pData->tftp_server);
1672	}
1673
1674	int slirp_set_binding_address(PNATState pData, char *addr)
1675	{
1676	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1677	{
1678	pData->bindIP.s_addr = INADDR_ANY;
1679	return 1;
1680	}
1681	return 0;
1682	}
1683
1684	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1685	{
1686	if (!pData->fUseHostResolver)
1687	{
1688	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1689	pData->fUseDnsProxy = fDNSProxy;
1690	}
1691	else if (fDNSProxy)
1692	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1693	}
1694
1695	#define CHECK_ARG(name, val, lim_min, lim_max) \
1696	do { \
1697	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1698	{ \
1699	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1700	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1701	return; \
1702	} \
1703	else \
1704	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1705	} while (0)
1706
1707	void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1708	{
1709	LogFlowFunc(("iSoMaxConn:%d\n", iSoMaxConn));
1710	/* Conditions */
1711	if (iSoMaxConn > SOMAXCONN)
1712	{
1713	LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1714	iSoMaxConn = SOMAXCONN;
1715	}
1716
1717	if (iSoMaxConn < 1)
1718	{
1719	LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1720	LogFlowFuncLeave();
1721	return;
1722	}
1723
1724	/* Asignment */
1725	if (pData->soMaxConn != iSoMaxConn)
1726	{
1727	LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1728	pData->soMaxConn, iSoMaxConn));
1729	pData->soMaxConn = iSoMaxConn;
1730	}
1731	LogFlowFuncLeave();
1732	}
1733	/* don't allow user set less 8kB and more than 1M values */
1734	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1735	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1736	{
1737	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1738	pData->socket_rcv = kilobytes;
1739	}
1740	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1741	{
1742	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1743	pData->socket_snd = kilobytes * _1K;
1744	}
1745	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1746	{
1747	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1748	tcp_rcvspace = kilobytes * _1K;
1749	}
1750	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1751	{
1752	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1753	tcp_sndspace = kilobytes * _1K;
1754	}
1755
1756	/*
1757	* Looking for Ether by ip in ARP-cache
1758	* Note: it´s responsible of caller to allocate buffer for result
1759	* @returns iprt status code
1760	*/
1761	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1762	{
1763	struct arp_cache_entry *ac;
1764
1765	if (ether == NULL)
1766	return VERR_INVALID_PARAMETER;
1767
1768	if (LIST_EMPTY(&pData->arp_cache))
1769	return VERR_NOT_FOUND;
1770
1771	LIST_FOREACH(ac, &pData->arp_cache, list)
1772	{
1773	if ( ac->ip == ip
1774	&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1775	{
1776	memcpy(ether, ac->ether, ETH_ALEN);
1777	return VINF_SUCCESS;
1778	}
1779	}
1780	return VERR_NOT_FOUND;
1781	}
1782
1783	/*
1784	* Looking for IP by Ether in ARP-cache
1785	* Note: it´s responsible of caller to allocate buffer for result
1786	* @returns 0 - if found, 1 - otherwise
1787	*/
1788	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1789	{
1790	struct arp_cache_entry *ac;
1791	*ip = INADDR_ANY;
1792
1793	if (LIST_EMPTY(&pData->arp_cache))
1794	return VERR_NOT_FOUND;
1795
1796	LIST_FOREACH(ac, &pData->arp_cache, list)
1797	{
1798	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1799	{
1800	*ip = ac->ip;
1801	return VINF_SUCCESS;
1802	}
1803	}
1804	return VERR_NOT_FOUND;
1805	}
1806
1807	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1808	{
1809	struct mbuf *m;
1810	struct ethhdr *ehdr;
1811	struct arphdr *ahdr;
1812	static bool fWarned = false;
1813	LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1814
1815	/* ARP request WHO HAS 0.0.0.0 is one of the signals
1816	* that something has been broken at Slirp. Investigating
1817	* pcap dumps it's easy to miss warning ARP requests being
1818	* focused on investigation of other protocols flow.
1819	*/
1820	#ifdef DEBUG_vvl
1821	Assert((dst != INADDR_ANY));
1822	NOREF(fWarned);
1823	#else
1824	if ( dst == INADDR_ANY
1825	&& !fWarned)
1826	{
1827	LogRel(("NAT: ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1828	fWarned = true;
1829	}
1830	#endif /* !DEBUG_vvl */
1831
1832	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1833	if (m == NULL)
1834	{
1835	Log(("NAT: Can't alloc mbuf for ARP request\n"));
1836	LogFlowFuncLeave();
1837	return;
1838	}
1839	ehdr = mtod(m, struct ethhdr *);
1840	memset(ehdr->h_source, 0xff, ETH_ALEN);
1841	ahdr = (struct arphdr *)&ehdr[1];
1842	ahdr->ar_hrd = RT_H2N_U16_C(1);
1843	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1844	ahdr->ar_hln = ETH_ALEN;
1845	ahdr->ar_pln = 4;
1846	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1847	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1848	/* we assume that this request come from gw, but not from DNS or TFTP */
1849	ahdr->ar_sha[5] = CTL_ALIAS;
1850	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1851	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1852	(uint32_t )ahdr->ar_tip = dst;
1853	/* warn!!! should falls in mbuf minimal size */
1854	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1855	m->m_data += ETH_HLEN;
1856	m->m_len -= ETH_HLEN;
1857	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1858	LogFlowFuncLeave();
1859	}
1860	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1861	void slirp_add_host_resolver_mapping(PNATState pData, const char pszHostName, const char pszHostNamePattern, uint32_t u32HostIP)
1862	{
1863	LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1864	pszHostName ? pszHostName : "(null)",
1865	pszHostNamePattern ? pszHostNamePattern : "(null)",
1866	u32HostIP));
1867	if ( ( pszHostName
1868	\|\| pszHostNamePattern)
1869	&& u32HostIP != INADDR_ANY
1870	&& u32HostIP != INADDR_BROADCAST)
1871	{
1872	PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1873	if (!pDnsMapping)
1874	{
1875	LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1876	LogFlowFuncLeave();
1877	return;
1878	}
1879	pDnsMapping->u32IpAddress = u32HostIP;
1880	if (pszHostName)
1881	pDnsMapping->pszCName = RTStrDup(pszHostName);
1882	else if (pszHostNamePattern)
1883	pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1884	if ( !pDnsMapping->pszCName
1885	&& !pDnsMapping->pszPattern)
1886	{
1887	LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1888	RTMemFree(pDnsMapping);
1889	LogFlowFuncLeave();
1890	return;
1891	}
1892	LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1893	LogRel(("NAT: User-defined mapping %s: %RTnaipv4 is registered\n",
1894	pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1895	pDnsMapping->u32IpAddress));
1896	}
1897	LogFlowFuncLeave();
1898	}
1899	#endif
1900
1901	/* updates the arp cache
1902	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1903	* @returns 0 - if has found and updated
1904	* 1 - if hasn't found.
1905	*/
1906	static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1907	{
1908	struct arp_cache_entry *ac;
1909	Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1910	&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1911	LIST_FOREACH(ac, &pData->arp_cache, list)
1912	{
1913	if (ac->ip == dst)
1914	{
1915	memcpy(ac->ether, mac, ETH_ALEN);
1916	return 0;
1917	}
1918	}
1919	return 1;
1920	}
1921
1922	/**
1923	* add entry to the arp cache
1924	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1925	*/
1926	static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1927	{
1928	struct arp_cache_entry *ac = NULL;
1929	Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
1930	&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
1931	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1932	if (ac == NULL)
1933	{
1934	Log(("NAT: Can't allocate arp cache entry\n"));
1935	return;
1936	}
1937	ac->ip = ip;
1938	memcpy(ac->ether, ether, ETH_ALEN);
1939	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
1940	}
1941
1942	/* updates or adds entry to the arp cache
1943	* @returns 0 - if has found and updated
1944	* 1 - if hasn't found.
1945	*/
1946	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1947	{
1948	if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1949	\|\| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
1950	{
1951	static bool fBroadcastEtherAddReported;
1952	if (!fBroadcastEtherAddReported)
1953	{
1954	LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
1955	mac, dst));
1956	fBroadcastEtherAddReported = true;
1957	}
1958	return 1;
1959	}
1960	if (slirp_arp_cache_update(pData, dst, mac))
1961	slirp_arp_cache_add(pData, dst, mac);
1962
1963	return 0;
1964	}
1965
1966
1967	void slirp_set_mtu(PNATState pData, int mtu)
1968	{
1969	if (mtu < 20 \|\| mtu >= 16000)
1970	{
1971	LogRel(("NAT: MTU(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
1972	mtu = 1500;
1973	}
1974	/* MTU is maximum transition unit on */
1975	if_mtu =
1976	if_mru = mtu;
1977	}
1978
1979	/**
1980	* Info handler.
1981	*/
1982	void slirp_info(PNATState pData, const void pvArg, const char pszArgs)
1983	{
1984	struct socket so, so_next;
1985	struct arp_cache_entry *ac;
1986	struct port_forward_rule *rule;
1987	PCDBGFINFOHLP pHlp = (PCDBGFINFOHLP)pvArg;
1988	NOREF(pszArgs);
1989
1990	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
1991	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
1992	QSOCKET_FOREACH(so, so_next, tcp)
1993	/* { */
1994	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1995	}
1996
1997	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
1998	QSOCKET_FOREACH(so, so_next, udp)
1999	/* { */
2000	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2001	}
2002
2003	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
2004	LIST_FOREACH(ac, &pData->arp_cache, list)
2005	{
2006	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
2007	}
2008
2009	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2010	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2011	{
2012	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2013	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2014	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2015	rule->activated ? ' ' : '*');
2016	}
2017	}
2018
2019	/**
2020	* @note: NATState::fUseHostResolver could be changed in bootp.c::dhcp_decode
2021	* @note: this function is executed on GUI/VirtualBox or main/VBoxHeadless thread.
2022	* @note: this function can potentially race with bootp.c::dhcp_decode (except Darwin)
2023	*/
2024	int slirp_host_network_configuration_change_strategy_selector(const PNATState pData)
2025	{
2026	if (pData->fUseHostResolverPermanent)
2027	return VBOX_NAT_DNS_HOSTRESOLVER;
2028
2029	if (pData->fUseDnsProxy) {
2030	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE /* XXX */ && !defined(RT_OS_WINDOWS)
2031	/* We dont conflict with bootp.c::dhcp_decode */
2032	struct rcp_state rcp_state;
2033	int rc;
2034
2035	rcp_state.rcps_flags \|= RCPSF_IGNORE_IPV6;
2036	rc = rcp_parse(&rcp_state, RESOLV_CONF_FILE);
2037	LogRelFunc(("NAT: rcp_parse:%Rrc old domain:%s new domain:%s\n",
2038	rc, LIST_EMPTY(&pData->pDomainList)
2039	? "(null)"
2040	: LIST_FIRST(&pData->pDomainList)->dd_pszDomain,
2041	rcp_state.rcps_domain));
2042	if ( RT_FAILURE(rc)
2043	\|\| LIST_EMPTY(&pData->pDomainList))
2044	return VBOX_NAT_DNS_DNSPROXY;
2045
2046	if ( rcp_state.rcps_domain
2047	&& strcmp(rcp_state.rcps_domain, LIST_FIRST(&pData->pDomainList)->dd_pszDomain) == 0)
2048	return VBOX_NAT_DNS_DNSPROXY;
2049	else
2050	return VBOX_NAT_DNS_EXTERNAL;
2051	#else
2052	/* copy domain name */
2053	/* domain only compare with coy version */
2054	return VBOX_NAT_DNS_DNSPROXY;
2055	#endif
2056	}
2057	return VBOX_NAT_DNS_EXTERNAL;
2058	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 58077

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