slirp.c@ 52755

Last change on this file since 52755 was 52755, checked in by vboxsync, 10 years ago
NAT: G/c socket:so_la - per-socket libalias instance used for port-forwarding - and concomitant code. It is never actually used as PACKET_TAG_ALIAS that is supposed to select it is never set. Its LibAliasRedirectPort() arguments were wrong too.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 67.5 KB

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1	/* $Id: slirp.c 52755 2014-09-15 21:31:50Z vboxsync $ */
2	/** @file
3	* NAT - slirp glue.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 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) && ((events).iErrorCode[fdset ## _win_bit] == 0))
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 void activate_port_forwarding(PNATState, const uint8_t *pEther);
264
265	static const uint8_t special_ethaddr[6] =
266	{
267	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
268	};
269
270	static const uint8_t broadcast_ethaddr[6] =
271	{
272	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
273	};
274
275	const uint8_t zerro_ethaddr[6] =
276	{
277	0x0, 0x0, 0x0, 0x0, 0x0, 0x0
278	};
279
280	/**
281	* This helper routine do the checks in descriptions to
282	* ''fUnderPolling'' and ''fShouldBeRemoved'' flags
283	* @returns 1 if socket removed and 0 if no changes was made.
284	*/
285	static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
286	{
287	AssertPtrReturn(pData, 0);
288	AssertPtrReturn(pSocket, 0);
289	AssertReturn(pSocket->fUnderPolling, 0);
290	if (pSocket->fShouldBeRemoved)
291	{
292	pSocket->fUnderPolling = 0;
293	sofree(pData, pSocket);
294	/* pSocket is PHANTOM, now */
295	return 1;
296	}
297	return 0;
298	}
299
300	int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
301	bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
302	int iIcmpCacheLimit, void *pvUser)
303	{
304	int rc;
305	PNATState pData;
306	if (u32Netmask & 0x1f)
307	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
308	return VERR_INVALID_PARAMETER;
309	pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
310	*ppData = pData;
311	if (!pData)
312	return VERR_NO_MEMORY;
313	pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
314	pData->fUseHostResolver = fUseHostResolver;
315	pData->fUseHostResolverPermanent = fUseHostResolver;
316	pData->pvUser = pvUser;
317	pData->netmask = u32Netmask;
318
319	rc = RTCritSectRwInit(&pData->CsRwHandlerChain);
320	if (RT_FAILURE(rc))
321	return rc;
322
323	/* sockets & TCP defaults */
324	pData->socket_rcv = 64 * _1K;
325	pData->socket_snd = 64 * _1K;
326	tcp_sndspace = 64 * _1K;
327	tcp_rcvspace = 64 * _1K;
328
329	/*
330	* Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
331	* to avoid release log noise.
332	*/
333	pData->soMaxConn = 10;
334
335	#ifdef RT_OS_WINDOWS
336	{
337	WSADATA Data;
338	WSAStartup(MAKEWORD(2, 0), &Data);
339	}
340	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
341	#endif
342
343	rc = bootp_dhcp_init(pData);
344	if (RT_FAILURE(rc))
345	{
346	Log(("NAT: DHCP server initialization failed\n"));
347	RTMemFree(pData);
348	*ppData = NULL;
349	return rc;
350	}
351	debug_init(pData);
352	if_init(pData);
353	ip_init(pData);
354	icmp_init(pData, iIcmpCacheLimit);
355
356	/* Initialise mbufs after setting the MTU */
357	mbuf_init(pData);
358
359	pData->special_addr.s_addr = u32NetAddr;
360	pData->slirp_ethaddr = &special_ethaddr[0];
361	alias_addr.s_addr = pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_ALIAS);
362	/* @todo: add ability to configure this staff */
363
364	/* set default addresses */
365	inet_aton("127.0.0.1", &loopback_addr);
366
367	rc = slirpTftpInit(pData);
368	AssertRCReturn(rc, VINF_NAT_DNS);
369
370	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
371	{
372	Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
373	i32AliasMode = 0;
374	}
375	pData->i32AliasMode = i32AliasMode;
376	getouraddr(pData);
377	{
378	int flags = 0;
379	struct in_addr proxy_addr;
380	pData->proxy_alias = LibAliasInit(pData, NULL);
381	if (pData->proxy_alias == NULL)
382	{
383	Log(("NAT: LibAlias default rule wasn't initialized\n"));
384	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
385	}
386	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
387	#ifndef NO_FW_PUNCH
388	flags \|= PKT_ALIAS_PUNCH_FW;
389	#endif
390	flags \|= pData->i32AliasMode; /* do transparent proxying */
391	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
392	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
393	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
394	ftp_alias_load(pData);
395	nbt_alias_load(pData);
396	if (pData->fUseHostResolver)
397	dns_alias_load(pData);
398	}
399	#ifdef VBOX_WITH_NAT_SEND2HOME
400	/* @todo: we should know all interfaces available on host. */
401	pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
402	pData->cInHomeAddressSize = 1;
403	inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
404	pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
405	# ifdef RT_OS_DARWIN
406	pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
407	# endif
408	#endif
409
410	slirp_link_up(pData);
411	return VINF_SUCCESS;
412	}
413
414	/**
415	* Register statistics.
416	*/
417	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
418	{
419	#ifdef VBOX_WITH_STATISTICS
420	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
421	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
422	# include "counters.h"
423	# undef COUNTER
424	/** @todo register statistics for the variables dumped by:
425	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
426	* mbufstats(pData); sockstats(pData); */
427	#else /* VBOX_WITH_STATISTICS */
428	NOREF(pData);
429	NOREF(pDrvIns);
430	#endif /* !VBOX_WITH_STATISTICS */
431	}
432
433	/**
434	* Deregister statistics.
435	*/
436	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
437	{
438	if (pData == NULL)
439	return;
440	#ifdef VBOX_WITH_STATISTICS
441	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
442	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
443	# include "counters.h"
444	#else /* VBOX_WITH_STATISTICS */
445	NOREF(pData);
446	NOREF(pDrvIns);
447	#endif /* !VBOX_WITH_STATISTICS */
448	}
449
450	/**
451	* Marks the link as up, making it possible to establish new connections.
452	*/
453	void slirp_link_up(PNATState pData)
454	{
455	struct arp_cache_entry *ac;
456
457	if (link_up == 1)
458	return;
459
460	link_up = 1;
461
462	if (!pData->fUseHostResolverPermanent)
463	slirpInitializeDnsSettings(pData);
464
465	if (LIST_EMPTY(&pData->arp_cache))
466	return;
467
468	LIST_FOREACH(ac, &pData->arp_cache, list)
469	{
470	activate_port_forwarding(pData, ac->ether);
471	}
472	}
473
474	/**
475	* Marks the link as down and cleans up the current connections.
476	*/
477	void slirp_link_down(PNATState pData)
478	{
479	struct socket *so;
480	struct port_forward_rule *rule;
481
482	if (link_up == 0)
483	return;
484
485	slirpReleaseDnsSettings(pData);
486
487	while ((so = tcb.so_next) != &tcb)
488	{
489	/* Don't miss TCB releasing */
490	if ( !sototcpcb(so)
491	&& ( so->so_state & SS_NOFDREF
492	\|\| so->s == -1))
493	sofree(pData, so);
494	else
495	tcp_close(pData, sototcpcb(so));
496	}
497
498	while ((so = udb.so_next) != &udb)
499	udp_detach(pData, so);
500
501	/*
502	* Clear the active state of port-forwarding rules to force
503	* re-setup on restoration of communications.
504	*/
505	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
506	{
507	rule->activated = 0;
508	}
509	pData->cRedirectionsActive = 0;
510
511	link_up = 0;
512	}
513
514	/**
515	* Terminates the slirp component.
516	*/
517	void slirp_term(PNATState pData)
518	{
519	if (pData == NULL)
520	return;
521	icmp_finit(pData);
522
523	slirp_link_down(pData);
524	ftp_alias_unload(pData);
525	nbt_alias_unload(pData);
526	if (pData->fUseHostResolver)
527	{
528	dns_alias_unload(pData);
529	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
530	while (!LIST_EMPTY(&pData->DNSMapHead))
531	{
532	PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
533	LIST_REMOVE(pDnsEntry, MapList);
534	RTStrFree(pDnsEntry->pszCName);
535	RTMemFree(pDnsEntry);
536	}
537	#endif
538	}
539	while (!LIST_EMPTY(&instancehead))
540	{
541	struct libalias *la = LIST_FIRST(&instancehead);
542	/* libalias do all clean up */
543	LibAliasUninit(la);
544	}
545	while (!LIST_EMPTY(&pData->arp_cache))
546	{
547	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
548	LIST_REMOVE(ac, list);
549	RTMemFree(ac);
550	}
551	slirpTftpTerm(pData);
552	bootp_dhcp_fini(pData);
553	m_fini(pData);
554	#ifdef RT_OS_WINDOWS
555	WSACleanup();
556	#endif
557	#ifndef VBOX_WITH_SLIRP_BSD_SBUF
558	#ifdef LOG_ENABLED
559	Log(("\n"
560	"NAT statistics\n"
561	"--------------\n"
562	"\n"));
563	ipstats(pData);
564	tcpstats(pData);
565	udpstats(pData);
566	icmpstats(pData);
567	mbufstats(pData);
568	sockstats(pData);
569	Log(("\n"
570	"\n"
571	"\n"));
572	#endif
573	#endif
574	RTCritSectRwDelete(&pData->CsRwHandlerChain);
575	RTMemFree(pData);
576	}
577
578
579	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
580	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
581
582	/*
583	* curtime kept to an accuracy of 1ms
584	*/
585	static void updtime(PNATState pData)
586	{
587	#ifdef RT_OS_WINDOWS
588	struct _timeb tb;
589
590	_ftime(&tb);
591	curtime = (u_int)tb.time * (u_int)1000;
592	curtime += (u_int)tb.millitm;
593	#else
594	gettimeofday(&tt, 0);
595
596	curtime = (u_int)tt.tv_sec * (u_int)1000;
597	curtime += (u_int)tt.tv_usec / (u_int)1000;
598
599	if ((tt.tv_usec % 1000) >= 500)
600	curtime++;
601	#endif
602	}
603
604	#ifdef RT_OS_WINDOWS
605	void slirp_select_fill(PNATState pData, int *pnfds)
606	#else /* RT_OS_WINDOWS */
607	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
608	#endif /* !RT_OS_WINDOWS */
609	{
610	struct socket so, so_next;
611	int nfds;
612	#if defined(RT_OS_WINDOWS)
613	int rc;
614	int error;
615	#else
616	int poll_index = 0;
617	#endif
618	int i;
619
620	STAM_PROFILE_START(&pData->StatFill, a);
621
622	nfds = *pnfds;
623
624	/*
625	* First, TCP sockets
626	*/
627	do_slowtimo = 0;
628	if (!link_up)
629	goto done;
630
631	/*
632	* *_slowtimo needs calling if there are IP fragments
633	* in the fragment queue, or there are TCP connections active
634	*/
635	/* XXX:
636	* triggering of fragment expiration should be the same but use new macroses
637	*/
638	do_slowtimo = (tcb.so_next != &tcb);
639	if (!do_slowtimo)
640	{
641	for (i = 0; i < IPREASS_NHASH; i++)
642	{
643	if (!TAILQ_EMPTY(&ipq[i]))
644	{
645	do_slowtimo = 1;
646	break;
647	}
648	}
649	}
650	/* always add the ICMP socket */
651	#ifndef RT_OS_WINDOWS
652	pData->icmp_socket.so_poll_index = -1;
653	#endif
654	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
655
656	STAM_COUNTER_RESET(&pData->StatTCP);
657	STAM_COUNTER_RESET(&pData->StatTCPHot);
658
659	QSOCKET_FOREACH(so, so_next, tcp)
660	/* { */
661	Assert(so->so_type == IPPROTO_TCP);
662	#if !defined(RT_OS_WINDOWS)
663	so->so_poll_index = -1;
664	#endif
665	STAM_COUNTER_INC(&pData->StatTCP);
666	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
667	/* TCP socket can't be cloned */
668	Assert((!so->so_cloneOf));
669	#endif
670	/*
671	* See if we need a tcp_fasttimo
672	*/
673	if ( time_fasttimo == 0
674	&& so->so_tcpcb != NULL
675	&& so->so_tcpcb->t_flags & TF_DELACK)
676	{
677	time_fasttimo = curtime; /* Flag when we want a fasttimo */
678	}
679
680	/*
681	* NOFDREF can include still connecting to local-host,
682	* newly socreated() sockets etc. Don't want to select these.
683	*/
684	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
685	CONTINUE(tcp);
686
687	/*
688	* Set for reading sockets which are accepting
689	*/
690	if (so->so_state & SS_FACCEPTCONN)
691	{
692	STAM_COUNTER_INC(&pData->StatTCPHot);
693	TCP_ENGAGE_EVENT1(so, readfds);
694	CONTINUE(tcp);
695	}
696
697	/*
698	* Set for writing sockets which are connecting
699	*/
700	if (so->so_state & SS_ISFCONNECTING)
701	{
702	Log2(("connecting %R[natsock] engaged\n",so));
703	STAM_COUNTER_INC(&pData->StatTCPHot);
704	#ifdef RT_OS_WINDOWS
705	WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
706	#else
707	TCP_ENGAGE_EVENT1(so, writefds);
708	#endif
709	}
710
711	/*
712	* Set for writing if we are connected, can send more, and
713	* we have something to send
714	*/
715	if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
716	{
717	STAM_COUNTER_INC(&pData->StatTCPHot);
718	TCP_ENGAGE_EVENT1(so, writefds);
719	}
720
721	/*
722	* Set for reading (and urgent data) if we are connected, can
723	* receive more, and we have room for it XXX /2 ?
724	*/
725	/* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
726	if ( CONN_CANFRCV(so)
727	&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
728	#ifdef RT_OS_WINDOWS
729	&& !(so->so_state & SS_ISFCONNECTING)
730	#endif
731	)
732	{
733	STAM_COUNTER_INC(&pData->StatTCPHot);
734	TCP_ENGAGE_EVENT2(so, readfds, xfds);
735	}
736	LOOP_LABEL(tcp, so, so_next);
737	}
738
739	/*
740	* UDP sockets
741	*/
742	STAM_COUNTER_RESET(&pData->StatUDP);
743	STAM_COUNTER_RESET(&pData->StatUDPHot);
744
745	QSOCKET_FOREACH(so, so_next, udp)
746	/* { */
747
748	Assert(so->so_type == IPPROTO_UDP);
749	STAM_COUNTER_INC(&pData->StatUDP);
750	#if !defined(RT_OS_WINDOWS)
751	so->so_poll_index = -1;
752	#endif
753
754	/*
755	* See if it's timed out
756	*/
757	if (so->so_expire)
758	{
759	if (so->so_expire <= curtime)
760	{
761	Log2(("NAT: %R[natsock] expired\n", so));
762	if (so->so_timeout != NULL)
763	{
764	/* so_timeout - might change the so_expire value or
765	* drop so_timeout* from so.
766	*/
767	so->so_timeout(pData, so, so->so_timeout_arg);
768	/* on 4.2 so->
769	*/
770	if ( so_next->so_prev != so /* so_timeout freed the socket */
771	\|\| so->so_timeout) /* so_timeout just freed so_timeout */
772	CONTINUE_NO_UNLOCK(udp);
773	}
774	UDP_DETACH(pData, so, so_next);
775	CONTINUE_NO_UNLOCK(udp);
776	}
777	}
778	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
779	if (so->so_cloneOf)
780	CONTINUE_NO_UNLOCK(udp);
781	#endif
782
783	/*
784	* When UDP packets are received from over the link, they're
785	* sendto()'d straight away, so no need for setting for writing
786	* Limit the number of packets queued by this session to 4.
787	* Note that even though we try and limit this to 4 packets,
788	* the session could have more queued if the packets needed
789	* to be fragmented.
790	*
791	* (XXX <= 4 ?)
792	*/
793	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
794	{
795	STAM_COUNTER_INC(&pData->StatUDPHot);
796	UDP_ENGAGE_EVENT(so, readfds);
797	}
798	LOOP_LABEL(udp, so, so_next);
799	}
800	done:
801
802	#if defined(RT_OS_WINDOWS)
803	*pnfds = VBOX_EVENT_COUNT;
804	#else /* RT_OS_WINDOWS */
805	AssertRelease(poll_index <= *pnfds);
806	*pnfds = poll_index;
807	#endif /* !RT_OS_WINDOWS */
808
809	STAM_PROFILE_STOP(&pData->StatFill, a);
810	}
811
812
813	/**
814	* This function do Connection or sending tcp sequence to.
815	* @returns if true operation completed
816	* @note: functions call tcp_input that potentially could lead to tcp_drop
817	*/
818	static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
819	{
820	int ret;
821	LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
822	/*
823	* Check for non-blocking, still-connecting sockets
824	*/
825	if (so->so_state & SS_ISFCONNECTING)
826	{
827	Log2(("connecting %R[natsock] catched\n", so));
828	/* Connected */
829	so->so_state &= ~SS_ISFCONNECTING;
830
831	/*
832	* This should be probably guarded by PROBE_CONN too. Anyway,
833	* we disable it on OS/2 because the below send call returns
834	* EFAULT which causes the opened TCP socket to close right
835	* after it has been opened and connected.
836	*/
837	#ifndef RT_OS_OS2
838	ret = send(so->s, (const char *)&ret, 0, 0);
839	if (ret < 0)
840	{
841	/* XXXXX Must fix, zero bytes is a NOP */
842	if ( soIgnorableErrorCode(errno)
843	\|\| errno == ENOTCONN)
844	{
845	LogFlowFunc(("LEAVE: false\n"));
846	return false;
847	}
848
849	/* else failed */
850	so->so_state = SS_NOFDREF;
851	}
852	/* else so->so_state &= ~SS_ISFCONNECTING; */
853	#endif
854
855	/*
856	* Continue tcp_input
857	*/
858	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
859	/* continue; */
860	}
861	else if (!fConnectOnly)
862	{
863	SOWRITE(ret, pData, so);
864	if (RT_LIKELY(ret > 0))
865	{
866	/*
867	* Make sure we will send window update to peer. This is
868	* a moral equivalent of calling tcp_output() for PRU_RCVD
869	* in tcp_usrreq() of the real stack.
870	*/
871	struct tcpcb *tp = sototcpcb(so);
872	if (RT_LIKELY(tp != NULL))
873	tp->t_flags \|= TF_DELACK;
874	}
875	}
876
877	LogFlowFunc(("LEAVE: true\n"));
878	return true;
879	}
880
881	#if defined(RT_OS_WINDOWS)
882	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
883	#else /* RT_OS_WINDOWS */
884	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
885	#endif /* !RT_OS_WINDOWS */
886	{
887	struct socket so, so_next;
888	int ret;
889	#if defined(RT_OS_WINDOWS)
890	WSANETWORKEVENTS NetworkEvents;
891	int rc;
892	int error;
893	#endif
894
895	STAM_PROFILE_START(&pData->StatPoll, a);
896
897	/* Update time */
898	updtime(pData);
899
900	/*
901	* See if anything has timed out
902	*/
903	if (link_up)
904	{
905	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
906	{
907	STAM_PROFILE_START(&pData->StatFastTimer, b);
908	tcp_fasttimo(pData);
909	time_fasttimo = 0;
910	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
911	}
912	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
913	{
914	STAM_PROFILE_START(&pData->StatSlowTimer, c);
915	ip_slowtimo(pData);
916	tcp_slowtimo(pData);
917	last_slowtimo = curtime;
918	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
919	}
920	}
921	#if defined(RT_OS_WINDOWS)
922	if (fTimeout)
923	return; /* only timer update */
924	#endif
925
926	/*
927	* Check sockets
928	*/
929	if (!link_up)
930	goto done;
931	#if defined(RT_OS_WINDOWS)
932	/*XXX: before renaming please make see define
933	* fIcmp in slirp_state.h
934	*/
935	if (fIcmp)
936	sorecvfrom(pData, &pData->icmp_socket);
937	#else
938	if ( (pData->icmp_socket.s != -1)
939	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
940	sorecvfrom(pData, &pData->icmp_socket);
941	#endif
942	/*
943	* Check TCP sockets
944	*/
945	QSOCKET_FOREACH(so, so_next, tcp)
946	/* { */
947	/* TCP socket can't be cloned */
948	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
949	Assert((!so->so_cloneOf));
950	#endif
951	Assert(!so->fUnderPolling);
952	so->fUnderPolling = 1;
953	if (slirpVerifyAndFreeSocket(pData, so))
954	CONTINUE(tcp);
955	/*
956	* FD_ISSET is meaningless on these sockets
957	* (and they can crash the program)
958	*/
959	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
960	{
961	so->fUnderPolling = 0;
962	CONTINUE(tcp);
963	}
964
965	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
966
967	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
968
969	if (so->so_state & SS_ISFCONNECTING)
970	{
971	bool reject = false;
972	#if !defined(RT_OS_WINDOWS)
973	{
974	/*
975	* Failed connect(2) is reported by poll(2) on
976	* different OSes with different combinations of
977	* POLLERR, POLLHUP, and POLLOUT.
978	*/
979	if ( CHECK_FD_SET(so, NetworkEvents, closefds) /* POLLHUP */
980	\|\| CHECK_FD_SET(so, NetworkEvents, rderr)) /* POLLERR */
981	{
982	reject = true;
983	}
984	#if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_NETBSD)
985	else if (CHECK_FD_SET(so, NetworkEvents, writefds)) /* POLLOUT */
986	{
987	/* Solaris and NetBSD report plain POLLOUT even on error */
988	int sockerr;
989	socklen_t optlen = (socklen_t)sizeof(sockerr);
990	ret = getsockopt(so->s, SOL_SOCKET, SO_ERROR, &sockerr, &optlen);
991	if (ret < 0)
992	sockerr = ENETDOWN;
993	if (sockerr != 0)
994	reject = true;
995	}
996	#endif
997	}
998	#else /* RT_OS_WINDOWS */
999	{
1000	/*
1001	* XXX: CHECK_FD_SET is defined to return false when
1002	* there's an error pending, which makes it unusable
1003	* here.
1004	*/
1005	if ( (NetworkEvents.lNetworkEvents & FD_CONNECT)
1006	&& NetworkEvents.iErrorCode[FD_CONNECT_BIT] != 0)
1007	{
1008	reject = true;
1009	}
1010	}
1011	#endif
1012	if (reject)
1013	{
1014	/* "continue" tcp_input() to reject connection from guest */
1015	so->so_state = SS_NOFDREF;
1016	TCP_INPUT(pData, NULL, 0, so);
1017	ret = slirpVerifyAndFreeSocket(pData, so);
1018	Assert(ret == 1); /* freed */
1019	CONTINUE(tcp);
1020	}
1021
1022	/*
1023	* XXX: For now just fall through to the old code to
1024	* handle successful connect(2).
1025	*/
1026	}
1027
1028	/*
1029	* Check for URG data
1030	* This will soread as well, so no need to
1031	* test for readfds below if this succeeds
1032	*/
1033
1034	/* out-of-band data */
1035	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
1036	#ifdef RT_OS_DARWIN
1037	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
1038	* combination on other Unixs hosts doesn't enter to this branch
1039	*/
1040	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
1041	#endif
1042	#ifdef RT_OS_WINDOWS
1043	/**
1044	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
1045	*/
1046	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
1047	#endif
1048	)
1049	{
1050	sorecvoob(pData, so);
1051	if (slirpVerifyAndFreeSocket(pData, so))
1052	CONTINUE(tcp);
1053	}
1054
1055	/*
1056	* Check sockets for reading
1057	*/
1058	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
1059	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
1060	{
1061
1062	#ifdef RT_OS_WINDOWS
1063	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
1064	{
1065	/* Finish connection first */
1066	/* should we ignore return value? */
1067	bool fRet = slirpConnectOrWrite(pData, so, true);
1068	LogFunc(("fRet:%RTbool\n", fRet));
1069	if (slirpVerifyAndFreeSocket(pData, so))
1070	CONTINUE(tcp);
1071	}
1072	#endif
1073	/*
1074	* Check for incoming connections
1075	*/
1076	if (so->so_state & SS_FACCEPTCONN)
1077	{
1078	TCP_CONNECT(pData, so);
1079	if (slirpVerifyAndFreeSocket(pData, so))
1080	CONTINUE(tcp);
1081	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
1082	{
1083	so->fUnderPolling = 0;
1084	CONTINUE(tcp);
1085	}
1086	}
1087
1088	ret = soread(pData, so);
1089	if (slirpVerifyAndFreeSocket(pData, so))
1090	CONTINUE(tcp);
1091	/* Output it if we read something */
1092	if (RT_LIKELY(ret > 0))
1093	TCP_OUTPUT(pData, sototcpcb(so));
1094
1095	if (slirpVerifyAndFreeSocket(pData, so))
1096	CONTINUE(tcp);
1097	}
1098
1099	/*
1100	* Check for FD_CLOSE events.
1101	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1102	*/
1103	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1104	\|\| (so->so_close == 1))
1105	{
1106	/*
1107	* drain the socket
1108	*/
1109	for (; so_next->so_prev == so
1110	&& !slirpVerifyAndFreeSocket(pData, so);)
1111	{
1112	ret = soread(pData, so);
1113	if (slirpVerifyAndFreeSocket(pData, so))
1114	break;
1115
1116	if (ret > 0)
1117	TCP_OUTPUT(pData, sototcpcb(so));
1118	else if (so_next->so_prev == so)
1119	{
1120	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1121	break;
1122	}
1123	}
1124
1125	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1126	if (so_next->so_prev == so)
1127	{
1128	/* mark the socket for termination _after_ it was drained */
1129	so->so_close = 1;
1130	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1131	* Actually in the specific error scenario, POLLERR is set as well. */
1132	#ifndef RT_OS_WINDOWS
1133	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1134	sofcantsendmore(so);
1135	#endif
1136	}
1137	if (so_next->so_prev == so)
1138	so->fUnderPolling = 0;
1139	CONTINUE(tcp);
1140	}
1141
1142	/*
1143	* Check sockets for writing
1144	*/
1145	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1146	#ifdef RT_OS_WINDOWS
1147	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1148	#endif
1149	)
1150	{
1151	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1152	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1153	* so we should be ready to such situations.
1154	*/
1155	if (slirpVerifyAndFreeSocket(pData, so))
1156	CONTINUE(tcp);
1157	else if (!fConnectOrWriteSuccess)
1158	{
1159	so->fUnderPolling = 0;
1160	CONTINUE(tcp);
1161	}
1162	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1163	}
1164
1165	/*
1166	* Probe a still-connecting, non-blocking socket
1167	* to check if it's still alive
1168	*/
1169	#ifdef PROBE_CONN
1170	if (so->so_state & SS_ISFCONNECTING)
1171	{
1172	ret = recv(so->s, (char *)&ret, 0, 0);
1173
1174	if (ret < 0)
1175	{
1176	/* XXX */
1177	if ( soIgnorableErrorCode(errno)
1178	\|\| errno == ENOTCONN)
1179	{
1180	CONTINUE(tcp); /* Still connecting, continue */
1181	}
1182
1183	/* else failed */
1184	so->so_state = SS_NOFDREF;
1185
1186	/* tcp_input will take care of it */
1187	}
1188	else
1189	{
1190	ret = send(so->s, &ret, 0, 0);
1191	if (ret < 0)
1192	{
1193	/* XXX */
1194	if ( soIgnorableErrorCode(errno)
1195	\|\| errno == ENOTCONN)
1196	{
1197	CONTINUE(tcp);
1198	}
1199	/* else failed */
1200	so->so_state = SS_NOFDREF;
1201	}
1202	else
1203	so->so_state &= ~SS_ISFCONNECTING;
1204
1205	}
1206	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1207	} /* SS_ISFCONNECTING */
1208	#endif
1209	if (!slirpVerifyAndFreeSocket(pData, so))
1210	so->fUnderPolling = 0;
1211	LOOP_LABEL(tcp, so, so_next);
1212	}
1213
1214	/*
1215	* Now UDP sockets.
1216	* Incoming packets are sent straight away, they're not buffered.
1217	* Incoming UDP data isn't buffered either.
1218	*/
1219	QSOCKET_FOREACH(so, so_next, udp)
1220	/* { */
1221	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1222	if (so->so_cloneOf)
1223	CONTINUE_NO_UNLOCK(udp);
1224	#endif
1225	#if 0
1226	so->fUnderPolling = 1;
1227	if(slirpVerifyAndFreeSocket(pData, so));
1228	CONTINUE(udp);
1229	so->fUnderPolling = 0;
1230	#endif
1231
1232	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1233
1234	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1235
1236	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1237	{
1238	SORECVFROM(pData, so);
1239	}
1240	LOOP_LABEL(udp, so, so_next);
1241	}
1242
1243	done:
1244
1245	STAM_PROFILE_STOP(&pData->StatPoll, a);
1246	}
1247
1248
1249	struct arphdr
1250	{
1251	unsigned short ar_hrd; /* format of hardware address */
1252	unsigned short ar_pro; /* format of protocol address */
1253	unsigned char ar_hln; /* length of hardware address */
1254	unsigned char ar_pln; /* length of protocol address */
1255	unsigned short ar_op; /* ARP opcode (command) */
1256
1257	/*
1258	* Ethernet looks like this : This bit is variable sized however...
1259	*/
1260	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1261	unsigned char ar_sip[4]; /* sender IP address */
1262	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1263	unsigned char ar_tip[4]; /* target IP address */
1264	};
1265	AssertCompileSize(struct arphdr, 28);
1266
1267	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1268	{
1269	struct ethhdr *pEtherHeaderResponse;
1270	struct arphdr *pARPHeaderResponse;
1271	uint32_t ip4TargetAddressInHostFormat;
1272	struct mbuf *pMbufResponse;
1273
1274	Assert((pcu8EtherSource));
1275	if (!pcu8EtherSource)
1276	return;
1277	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1278
1279	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1280	if (!pMbufResponse)
1281	return;
1282	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1283	/* @note: if_encap will swap src and dst*/
1284	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1285	pMbufResponse->m_data += ETH_HLEN;
1286	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1287	pMbufResponse->m_len = sizeof(struct arphdr);
1288
1289	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1290	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1291	pARPHeaderResponse->ar_hln = ETH_ALEN;
1292	pARPHeaderResponse->ar_pln = 4;
1293	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1294	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1295
1296	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1297	{
1298	static bool fTagErrorReported;
1299	if (!fTagErrorReported)
1300	{
1301	LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
1302	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1303	fTagErrorReported = true;
1304	}
1305	}
1306	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1307
1308	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1309	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1310	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1311	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1312	}
1313	/**
1314	* @note This function will free m!
1315	*/
1316	static void arp_input(PNATState pData, struct mbuf *m)
1317	{
1318	struct ethhdr *pEtherHeader;
1319	struct arphdr *pARPHeader;
1320	uint32_t ip4TargetAddress;
1321
1322	int ar_op;
1323	pEtherHeader = mtod(m, struct ethhdr *);
1324	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1325
1326	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1327	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1328
1329	switch (ar_op)
1330	{
1331	case ARPOP_REQUEST:
1332	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1333	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1334	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1335	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1336
1337	/* Gratuitous ARP */
1338	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1339	&& memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1340	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1341	{
1342	/* We've received an announce about address assignment,
1343	* let's do an ARP cache update
1344	*/
1345	static bool fGratuitousArpReported;
1346	if (!fGratuitousArpReported)
1347	{
1348	LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
1349	pARPHeader->ar_sip, pARPHeader->ar_sha));
1350	fGratuitousArpReported = true;
1351	}
1352	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1353	}
1354	break;
1355
1356	case ARPOP_REPLY:
1357	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1358	break;
1359
1360	default:
1361	break;
1362	}
1363
1364	m_freem(pData, m);
1365	}
1366
1367	/**
1368	* Feed a packet into the slirp engine.
1369	*
1370	* @param m Data buffer, m_len is not valid.
1371	* @param cbBuf The length of the data in m.
1372	*/
1373	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1374	{
1375	int proto;
1376	static bool fWarnedIpv6;
1377	struct ethhdr *eh;
1378	uint8_t au8Ether[ETH_ALEN];
1379
1380	m->m_len = cbBuf;
1381	if (cbBuf < ETH_HLEN)
1382	{
1383	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1384	m_freem(pData, m);
1385	return;
1386	}
1387	eh = mtod(m, struct ethhdr *);
1388	proto = RT_N2H_U16(eh->h_proto);
1389
1390	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1391
1392	switch(proto)
1393	{
1394	case ETH_P_ARP:
1395	arp_input(pData, m);
1396	break;
1397
1398	case ETH_P_IP:
1399	/* Update time. Important if the network is very quiet, as otherwise
1400	* the first outgoing connection gets an incorrect timestamp. */
1401	updtime(pData);
1402	m_adj(m, ETH_HLEN);
1403	M_ASSERTPKTHDR(m);
1404	m->m_pkthdr.header = mtod(m, void *);
1405	ip_input(pData, m);
1406	break;
1407
1408	case ETH_P_IPV6:
1409	m_freem(pData, m);
1410	if (!fWarnedIpv6)
1411	{
1412	LogRel(("NAT: IPv6 not supported\n"));
1413	fWarnedIpv6 = true;
1414	}
1415	break;
1416
1417	default:
1418	Log(("NAT: Unsupported protocol %x\n", proto));
1419	m_freem(pData, m);
1420	break;
1421	}
1422
1423	if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1424	activate_port_forwarding(pData, au8Ether);
1425	}
1426
1427	/**
1428	* Output the IP packet to the ethernet device.
1429	*
1430	* @note This function will free m!
1431	*/
1432	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1433	{
1434	struct ethhdr *eh;
1435	uint8_t *mbuf = NULL;
1436	size_t mlen = 0;
1437	STAM_PROFILE_START(&pData->StatIF_encap, a);
1438	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1439	pData, eth_proto, m, flags));
1440
1441	M_ASSERTPKTHDR(m);
1442	m->m_data -= ETH_HLEN;
1443	m->m_len += ETH_HLEN;
1444	eh = mtod(m, struct ethhdr *);
1445	mlen = m->m_len;
1446
1447	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1448	{
1449	struct m_tag *t = m_tag_first(m);
1450	uint8_t u8ServiceId = CTL_ALIAS;
1451	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1452	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1453	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1454	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1455	{
1456	/* don't do anything */
1457	m_freem(pData, m);
1458	goto done;
1459	}
1460	if ( t
1461	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1462	{
1463	Assert(t);
1464	u8ServiceId = (uint8_t )&t[1];
1465	}
1466	eh->h_source[5] = u8ServiceId;
1467	}
1468	/*
1469	* we're processing the chain, that isn't not expected.
1470	*/
1471	Assert((!m->m_next));
1472	if (m->m_next)
1473	{
1474	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1475	m_freem(pData, m);
1476	goto done;
1477	}
1478	mbuf = mtod(m, uint8_t *);
1479	eh->h_proto = RT_H2N_U16(eth_proto);
1480	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1481	if (flags & ETH_ENCAP_URG)
1482	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1483	else
1484	slirp_output(pData->pvUser, m, mbuf, mlen);
1485	done:
1486	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1487	LogFlowFuncLeave();
1488	}
1489
1490	/**
1491	* Still we're using dhcp server leasing to map ether to IP
1492	* @todo see rt_lookup_in_cache
1493	*/
1494	static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1495	{
1496	uint32_t ip = INADDR_ANY;
1497	int rc;
1498
1499	if (eth_addr == NULL)
1500	return INADDR_ANY;
1501
1502	if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1503	\|\| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1504	return INADDR_ANY;
1505
1506	rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1507	if (RT_SUCCESS(rc))
1508	return ip;
1509
1510	bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1511	/* ignore return code, ip will be set to INADDR_ANY on error */
1512	return ip;
1513	}
1514
1515	/**
1516	* We need check if we've activated port forwarding
1517	* for specific machine ... that of course relates to
1518	* service mode
1519	* @todo finish this for service case
1520	*/
1521	static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1522	{
1523	struct port_forward_rule rule, tmp;
1524	const uint8_t *pu8EthSource = h_source;
1525
1526	/* check mac here */
1527	LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1528	{
1529	struct socket *so;
1530	struct sockaddr sa;
1531	struct sockaddr_in *psin;
1532	socklen_t socketlen;
1533	int rc;
1534	uint32_t guest_addr; /* need to understand if we already give address to guest */
1535
1536	if (rule->activated)
1537	continue;
1538
1539	#ifdef VBOX_WITH_NAT_SERVICE
1540	/**
1541	* case when guest ip is INADDR_ANY shouldn't appear in NAT service
1542	*/
1543	Assert((rule->guest_addr.s_addr != INADDR_ANY));
1544	guest_addr = rule->guest_addr.s_addr;
1545	#else /* VBOX_WITH_NAT_SERVICE */
1546	guest_addr = find_guest_ip(pData, pu8EthSource);
1547	#endif /* !VBOX_WITH_NAT_SERVICE */
1548	if (guest_addr == INADDR_ANY)
1549	{
1550	/* the address wasn't granted */
1551	return;
1552	}
1553
1554	#if !defined(VBOX_WITH_NAT_SERVICE)
1555	if ( rule->guest_addr.s_addr != guest_addr
1556	&& rule->guest_addr.s_addr != INADDR_ANY)
1557	continue;
1558	if (rule->guest_addr.s_addr == INADDR_ANY)
1559	rule->guest_addr.s_addr = guest_addr;
1560	#endif
1561
1562	LogRel(("NAT: set redirect %s host %RTnaipv4:%d => guest %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
1567	if (rule->proto == IPPROTO_UDP)
1568	so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1569	RT_H2N_U16(rule->guest_port), 0);
1570	else
1571	so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1572	RT_H2N_U16(rule->guest_port), 0);
1573
1574	if (so == NULL)
1575	goto remove_port_forwarding;
1576
1577	psin = (struct sockaddr_in *)&sa;
1578	psin->sin_family = AF_INET;
1579	psin->sin_port = 0;
1580	psin->sin_addr.s_addr = INADDR_ANY;
1581	socketlen = sizeof(struct sockaddr);
1582
1583	rc = getsockname(so->s, &sa, &socketlen);
1584	if (rc < 0 \|\| sa.sa_family != AF_INET)
1585	goto remove_port_forwarding;
1586
1587	rule->activated = 1;
1588	rule->so = so;
1589	pData->cRedirectionsActive++;
1590	continue;
1591
1592	remove_port_forwarding:
1593	LogRel(("NAT: failed to redirect %s %RTnaipv4:%d => %RTnaipv4:%d\n",
1594	(rule->proto == IPPROTO_UDP ? "UDP" : "TCP"),
1595	rule->bind_ip.s_addr, rule->host_port,
1596	guest_addr, rule->guest_port));
1597	LIST_REMOVE(rule, list);
1598	pData->cRedirectionsStored--;
1599	RTMemFree(rule);
1600	}
1601	}
1602
1603	/**
1604	* Changes in 3.1 instead of opening new socket do the following:
1605	* gain more information:
1606	* 1. bind IP
1607	* 2. host port
1608	* 3. guest port
1609	* 4. proto
1610	* 5. guest MAC address
1611	* the guest's MAC address is rather important for service, but we easily
1612	* could get it from VM configuration in DrvNAT or Service, the idea is activating
1613	* corresponding port-forwarding
1614	*/
1615	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1616	struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1617	{
1618	struct port_forward_rule *rule = NULL;
1619	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1620	{
1621	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1622	&& rule->host_port == host_port
1623	&& rule->bind_ip.s_addr == host_addr.s_addr
1624	&& rule->guest_port == guest_port
1625	&& rule->guest_addr.s_addr == guest_addr.s_addr
1626	)
1627	return 0; /* rule has been already registered */
1628	}
1629
1630	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1631	if (rule == NULL)
1632	return 1;
1633
1634	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1635	rule->host_port = host_port;
1636	rule->guest_port = guest_port;
1637	rule->guest_addr.s_addr = guest_addr.s_addr;
1638	rule->bind_ip.s_addr = host_addr.s_addr;
1639	if (ethaddr != NULL)
1640	memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1641	/* @todo add mac address */
1642	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1643	pData->cRedirectionsStored++;
1644	/* activate port-forwarding if guest has already got assigned IP */
1645	if ( ethaddr
1646	&& memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
1647	activate_port_forwarding(pData, ethaddr);
1648	return 0;
1649	}
1650
1651	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1652	struct in_addr guest_addr, int guest_port)
1653	{
1654	struct port_forward_rule *rule = NULL;
1655	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1656	{
1657	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1658	&& rule->host_port == host_port
1659	&& rule->guest_port == guest_port
1660	&& rule->bind_ip.s_addr == host_addr.s_addr
1661	&& rule->guest_addr.s_addr == guest_addr.s_addr
1662	&& rule->activated)
1663	{
1664	LogRel(("NAT: remove redirect %s host %RTnaipv4:%d => guest %RTnaipv4:%d\n",
1665	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1666	rule->bind_ip.s_addr, rule->host_port,
1667	guest_addr.s_addr, rule->guest_port));
1668
1669	if (is_udp)
1670	udp_detach(pData, rule->so);
1671	else
1672	tcp_close(pData, sototcpcb(rule->so));
1673	LIST_REMOVE(rule, list);
1674	RTMemFree(rule);
1675	pData->cRedirectionsStored--;
1676	break;
1677	}
1678
1679	}
1680	return 0;
1681	}
1682
1683	void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1684	{
1685	#ifndef VBOX_WITH_NAT_SERVICE
1686	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1687	#endif
1688	if (GuestIP != INADDR_ANY)
1689	{
1690	slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1691	activate_port_forwarding(pData, ethaddr);
1692	}
1693	}
1694
1695	#if defined(RT_OS_WINDOWS)
1696	HANDLE *slirp_get_events(PNATState pData)
1697	{
1698	return pData->phEvents;
1699	}
1700	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1701	{
1702	pData->phEvents[index] = hEvent;
1703	}
1704	#endif
1705
1706	unsigned int slirp_get_timeout_ms(PNATState pData)
1707	{
1708	if (link_up)
1709	{
1710	if (time_fasttimo)
1711	return 2;
1712	if (do_slowtimo)
1713	return 500; /* see PR_SLOWHZ */
1714	}
1715	return 36001000; / one hour */
1716	}
1717
1718	#ifndef RT_OS_WINDOWS
1719	int slirp_get_nsock(PNATState pData)
1720	{
1721	return pData->nsock;
1722	}
1723	#endif
1724
1725	/*
1726	* this function called from NAT thread
1727	*/
1728	void slirp_post_sent(PNATState pData, void *pvArg)
1729	{
1730	struct mbuf m = (struct mbuf )pvArg;
1731	m_freem(pData, m);
1732	}
1733
1734	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1735	{
1736	Log2(("tftp_prefix: %s\n", tftpPrefix));
1737	tftp_prefix = tftpPrefix;
1738	}
1739
1740	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1741	{
1742	Log2(("bootFile: %s\n", bootFile));
1743	bootp_filename = bootFile;
1744	}
1745
1746	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1747	{
1748	Log2(("next_server: %s\n", next_server));
1749	if (next_server == NULL)
1750	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1751	else
1752	inet_aton(next_server, &pData->tftp_server);
1753	}
1754
1755	int slirp_set_binding_address(PNATState pData, char *addr)
1756	{
1757	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1758	{
1759	pData->bindIP.s_addr = INADDR_ANY;
1760	return 1;
1761	}
1762	return 0;
1763	}
1764
1765	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1766	{
1767	if (!pData->fUseHostResolver)
1768	{
1769	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1770	pData->fUseDnsProxy = fDNSProxy;
1771	}
1772	else if (fDNSProxy)
1773	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1774	}
1775
1776	#define CHECK_ARG(name, val, lim_min, lim_max) \
1777	do { \
1778	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1779	{ \
1780	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1781	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1782	return; \
1783	} \
1784	else \
1785	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1786	} while (0)
1787
1788	void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1789	{
1790	LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
1791	/* Conditions */
1792	if (iSoMaxConn > SOMAXCONN)
1793	{
1794	LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1795	iSoMaxConn = SOMAXCONN;
1796	}
1797
1798	if (iSoMaxConn < 1)
1799	{
1800	LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1801	LogFlowFuncLeave();
1802	return;
1803	}
1804
1805	/* Asignment */
1806	if (pData->soMaxConn != iSoMaxConn)
1807	{
1808	LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1809	pData->soMaxConn, iSoMaxConn));
1810	pData->soMaxConn = iSoMaxConn;
1811	}
1812	LogFlowFuncLeave();
1813	}
1814	/* don't allow user set less 8kB and more than 1M values */
1815	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1816	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1817	{
1818	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1819	pData->socket_rcv = kilobytes;
1820	}
1821	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1822	{
1823	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1824	pData->socket_snd = kilobytes * _1K;
1825	}
1826	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1827	{
1828	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1829	tcp_rcvspace = kilobytes * _1K;
1830	}
1831	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1832	{
1833	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1834	tcp_sndspace = kilobytes * _1K;
1835	}
1836
1837	/*
1838	* Looking for Ether by ip in ARP-cache
1839	* Note: it´s responsible of caller to allocate buffer for result
1840	* @returns iprt status code
1841	*/
1842	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1843	{
1844	struct arp_cache_entry *ac;
1845
1846	if (ether == NULL)
1847	return VERR_INVALID_PARAMETER;
1848
1849	if (LIST_EMPTY(&pData->arp_cache))
1850	return VERR_NOT_FOUND;
1851
1852	LIST_FOREACH(ac, &pData->arp_cache, list)
1853	{
1854	if ( ac->ip == ip
1855	&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1856	{
1857	memcpy(ether, ac->ether, ETH_ALEN);
1858	return VINF_SUCCESS;
1859	}
1860	}
1861	return VERR_NOT_FOUND;
1862	}
1863
1864	/*
1865	* Looking for IP by Ether in ARP-cache
1866	* Note: it´s responsible of caller to allocate buffer for result
1867	* @returns 0 - if found, 1 - otherwise
1868	*/
1869	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1870	{
1871	struct arp_cache_entry *ac;
1872	*ip = INADDR_ANY;
1873
1874	if (LIST_EMPTY(&pData->arp_cache))
1875	return VERR_NOT_FOUND;
1876
1877	LIST_FOREACH(ac, &pData->arp_cache, list)
1878	{
1879	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1880	{
1881	*ip = ac->ip;
1882	return VINF_SUCCESS;
1883	}
1884	}
1885	return VERR_NOT_FOUND;
1886	}
1887
1888	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1889	{
1890	struct mbuf *m;
1891	struct ethhdr *ehdr;
1892	struct arphdr *ahdr;
1893	static bool fWarned = false;
1894	LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1895
1896	/* ARP request WHO HAS 0.0.0.0 is one of the signals
1897	* that something has been broken at Slirp. Investigating
1898	* pcap dumps it's easy to miss warning ARP requests being
1899	* focused on investigation of other protocols flow.
1900	*/
1901	#ifdef DEBUG_vvl
1902	Assert((dst != INADDR_ANY));
1903	NOREF(fWarned);
1904	#else
1905	if ( dst == INADDR_ANY
1906	&& !fWarned)
1907	{
1908	LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1909	fWarned = true;
1910	}
1911	#endif /* !DEBUG_vvl */
1912
1913	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1914	if (m == NULL)
1915	{
1916	Log(("NAT: Can't alloc mbuf for ARP request\n"));
1917	LogFlowFuncLeave();
1918	return;
1919	}
1920	ehdr = mtod(m, struct ethhdr *);
1921	memset(ehdr->h_source, 0xff, ETH_ALEN);
1922	ahdr = (struct arphdr *)&ehdr[1];
1923	ahdr->ar_hrd = RT_H2N_U16_C(1);
1924	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1925	ahdr->ar_hln = ETH_ALEN;
1926	ahdr->ar_pln = 4;
1927	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1928	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1929	/* we assume that this request come from gw, but not from DNS or TFTP */
1930	ahdr->ar_sha[5] = CTL_ALIAS;
1931	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1932	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1933	(uint32_t )ahdr->ar_tip = dst;
1934	/* warn!!! should falls in mbuf minimal size */
1935	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1936	m->m_data += ETH_HLEN;
1937	m->m_len -= ETH_HLEN;
1938	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1939	LogFlowFuncLeave();
1940	}
1941	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1942	void slirp_add_host_resolver_mapping(PNATState pData, const char pszHostName, const char pszHostNamePattern, uint32_t u32HostIP)
1943	{
1944	LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1945	pszHostName ? pszHostName : "(null)",
1946	pszHostNamePattern ? pszHostNamePattern : "(null)",
1947	u32HostIP));
1948	if ( ( pszHostName
1949	\|\| pszHostNamePattern)
1950	&& u32HostIP != INADDR_ANY
1951	&& u32HostIP != INADDR_BROADCAST)
1952	{
1953	PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1954	if (!pDnsMapping)
1955	{
1956	LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1957	LogFlowFuncLeave();
1958	return;
1959	}
1960	pDnsMapping->u32IpAddress = u32HostIP;
1961	if (pszHostName)
1962	pDnsMapping->pszCName = RTStrDup(pszHostName);
1963	else if (pszHostNamePattern)
1964	pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1965	if ( !pDnsMapping->pszCName
1966	&& !pDnsMapping->pszPattern)
1967	{
1968	LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1969	RTMemFree(pDnsMapping);
1970	LogFlowFuncLeave();
1971	return;
1972	}
1973	LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1974	LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
1975	pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1976	pDnsMapping->u32IpAddress));
1977	}
1978	LogFlowFuncLeave();
1979	}
1980	#endif
1981
1982	/* updates the arp cache
1983	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1984	* @returns 0 - if has found and updated
1985	* 1 - if hasn't found.
1986	*/
1987	static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1988	{
1989	struct arp_cache_entry *ac;
1990	Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1991	&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1992	LIST_FOREACH(ac, &pData->arp_cache, list)
1993	{
1994	if (ac->ip == dst)
1995	{
1996	memcpy(ac->ether, mac, ETH_ALEN);
1997	return 0;
1998	}
1999	}
2000	return 1;
2001	}
2002
2003	/**
2004	* add entry to the arp cache
2005	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
2006	*/
2007	static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
2008	{
2009	struct arp_cache_entry *ac = NULL;
2010	Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
2011	&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
2012	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
2013	if (ac == NULL)
2014	{
2015	Log(("NAT: Can't allocate arp cache entry\n"));
2016	return;
2017	}
2018	ac->ip = ip;
2019	memcpy(ac->ether, ether, ETH_ALEN);
2020	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
2021	}
2022
2023	/* updates or adds entry to the arp cache
2024	* @returns 0 - if has found and updated
2025	* 1 - if hasn't found.
2026	*/
2027	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
2028	{
2029	if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
2030	\|\| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
2031	{
2032	static bool fBroadcastEtherAddReported;
2033	if (!fBroadcastEtherAddReported)
2034	{
2035	LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
2036	mac, dst));
2037	fBroadcastEtherAddReported = true;
2038	}
2039	return 1;
2040	}
2041	if (slirp_arp_cache_update(pData, dst, mac))
2042	slirp_arp_cache_add(pData, dst, mac);
2043
2044	return 0;
2045	}
2046
2047
2048	void slirp_set_mtu(PNATState pData, int mtu)
2049	{
2050	if (mtu < 20 \|\| mtu >= 16000)
2051	{
2052	LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
2053	mtu = 1500;
2054	}
2055	/* MTU is maximum transition unit on */
2056	if_mtu =
2057	if_mru = mtu;
2058	}
2059
2060	/**
2061	* Info handler.
2062	*/
2063	void slirp_info(PNATState pData, const void pvArg, const char pszArgs)
2064	{
2065	struct socket so, so_next;
2066	struct arp_cache_entry *ac;
2067	struct port_forward_rule *rule;
2068	PCDBGFINFOHLP pHlp = (PCDBGFINFOHLP)pvArg;
2069	NOREF(pszArgs);
2070
2071	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
2072	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
2073	QSOCKET_FOREACH(so, so_next, tcp)
2074	/* { */
2075	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2076	}
2077
2078	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
2079	QSOCKET_FOREACH(so, so_next, udp)
2080	/* { */
2081	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2082	}
2083
2084	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
2085	LIST_FOREACH(ac, &pData->arp_cache, list)
2086	{
2087	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
2088	}
2089
2090	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2091	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2092	{
2093	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2094	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2095	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2096	rule->activated ? ' ' : '*');
2097	}
2098	}
2099
2100	/**
2101	* @note: NATState::fUseHostResolver could be changed in bootp.c::dhcp_decode
2102	* @note: this function is executed on GUI/VirtualBox or main/VBoxHeadless thread.
2103	* @note: this function can potentially race with bootp.c::dhcp_decode (except Darwin)
2104	*/
2105	int slirp_host_network_configuration_change_strategy_selector(const PNATState pData)
2106	{
2107	if (pData->fUseHostResolverPermanent)
2108	return VBOX_NAT_DNS_HOSTRESOLVER;
2109
2110	if (pData->fUseDnsProxy) {
2111	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
2112	/* We dont conflict with bootp.c::dhcp_decode */
2113	struct rcp_state rcp_state;
2114	int rc;
2115
2116	rcp_state.rcps_flags \|= RCPSF_IGNORE_IPV6;
2117	rc = rcp_parse(&rcp_state, RESOLV_CONF_FILE);
2118	LogRelFunc(("NAT: rcp_parse:%Rrc old domain:%s new domain:%s\n",
2119	rc, LIST_FIRST(&pData->pDomainList)->dd_pszDomain,
2120	rcp_state.rcps_domain));
2121	if ( RT_FAILURE(rc)
2122	\|\| LIST_EMPTY(&pData->pDomainList))
2123	return VBOX_NAT_DNS_DNSPROXY;
2124
2125	if ( rcp_state.rcps_domain
2126	&& strcmp(rcp_state.rcps_domain, LIST_FIRST(&pData->pDomainList)->dd_pszDomain) == 0)
2127	return VBOX_NAT_DNS_DNSPROXY;
2128	else
2129	return VBOX_NAT_DNS_EXTERNAL;
2130	#else
2131	/* copy domain name */
2132	/* domain only compare with coy version */
2133	return VBOX_NAT_DNS_DNSPROXY;
2134	#endif
2135	}
2136	return VBOX_NAT_DNS_EXTERNAL;
2137	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 52755

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