slirp.c@ 43575

最後變更在這個檔案從43575是 43233,由 vboxsync 提交於 13 年前
NAT: destroy really all memory in drvNATDestruct
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1	/* $Id: slirp.c 43233 2012-09-06 20:21:37Z vboxsync $ */
2	/** @file
3	* NAT - slirp glue.
4	*/
5
6	/*
7	* Copyright (C) 2006-2011 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.alldomusa.eu.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/pdmdrv.h>
51	#include <iprt/assert.h>
52	#include <iprt/file.h>
53	#ifndef RT_OS_WINDOWS
54	# include <sys/ioctl.h>
55	# include <poll.h>
56	# include <netinet/in.h>
57	#else
58	# include <Winnls.h>
59	# define _WINSOCK2API_
60	# include <IPHlpApi.h>
61	#endif
62	#include <alias.h>
63
64	#ifndef RT_OS_WINDOWS
65
66	# define DO_ENGAGE_EVENT1(so, fdset, label) \
67	do { \
68	if ( so->so_poll_index != -1 \
69	&& so->s == polls[so->so_poll_index].fd) \
70	{ \
71	polls[so->so_poll_index].events \|= N_(fdset ## _poll); \
72	break; \
73	} \
74	AssertRelease(poll_index < (nfds)); \
75	AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
76	polls[poll_index].fd = (so)->s; \
77	(so)->so_poll_index = poll_index; \
78	polls[poll_index].events = N_(fdset ## _poll); \
79	polls[poll_index].revents = 0; \
80	poll_index++; \
81	} while (0)
82
83	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
84	do { \
85	if ( so->so_poll_index != -1 \
86	&& so->s == polls[so->so_poll_index].fd) \
87	{ \
88	polls[so->so_poll_index].events \|= \
89	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
90	break; \
91	} \
92	AssertRelease(poll_index < (nfds)); \
93	polls[poll_index].fd = (so)->s; \
94	(so)->so_poll_index = poll_index; \
95	polls[poll_index].events = \
96	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
97	poll_index++; \
98	} while (0)
99
100	# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
101
102	/*
103	* DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
104	* gcc warns about attempts to log POLLNVAL so construction in a last to lines
105	* used to catch POLLNVAL while logging and return false in case of error while
106	* normal usage.
107	*/
108	# define DO_CHECK_FD_SET(so, events, fdset) \
109	( ((so)->so_poll_index != -1) \
110	&& ((so)->so_poll_index <= ndfs) \
111	&& ((so)->s == polls[so->so_poll_index].fd) \
112	&& (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
113	&& ( N_(fdset ## _poll) == POLLNVAL \
114	\|\| !(polls[(so)->so_poll_index].revents & POLLNVAL)))
115
116	/* specific for Windows Winsock API */
117	# define DO_WIN_CHECK_FD_SET(so, events, fdset) 0
118
119	# ifndef RT_OS_LINUX
120	# define readfds_poll (POLLRDNORM)
121	# define writefds_poll (POLLWRNORM)
122	# else
123	# define readfds_poll (POLLIN)
124	# define writefds_poll (POLLOUT)
125	# endif
126	# define xfds_poll (POLLPRI)
127	# define closefds_poll (POLLHUP)
128	# define rderr_poll (POLLERR)
129	# if 0 /* unused yet */
130	# define rdhup_poll (POLLHUP)
131	# define nval_poll (POLLNVAL)
132	# endif
133
134	# define ICMP_ENGAGE_EVENT(so, fdset) \
135	do { \
136	if (pData->icmp_socket.s != -1) \
137	DO_ENGAGE_EVENT1((so), fdset, ICMP); \
138	} while (0)
139
140	#else /* RT_OS_WINDOWS */
141
142	/*
143	* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
144	* So no call to WSAEventSelect necessary.
145	*/
146	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while (0)
147
148	/*
149	* On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
150	*/
151	# define DO_ENGAGE_EVENT1(so, fdset1, label) \
152	do { \
153	rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
154	if (rc == SOCKET_ERROR) \
155	{ \
156	/* This should not happen */ \
157	error = WSAGetLastError(); \
158	LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
159	error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
160	} \
161	} while (0); \
162	CONTINUE(label)
163
164	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
165	DO_ENGAGE_EVENT1((so), (fdset1), label)
166
167	# define DO_POLL_EVENTS(rc, error, so, events, label) \
168	(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
169	if ((rc) == SOCKET_ERROR) \
170	{ \
171	(error) = WSAGetLastError(); \
172	LogRel(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
173	LogFunc(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
174	CONTINUE(label); \
175	}
176
177	# define acceptds_win FD_ACCEPT
178	# define acceptds_win_bit FD_ACCEPT_BIT
179	# define readfds_win FD_READ
180	# define readfds_win_bit FD_READ_BIT
181	# define writefds_win FD_WRITE
182	# define writefds_win_bit FD_WRITE_BIT
183	# define xfds_win FD_OOB
184	# define xfds_win_bit FD_OOB_BIT
185	# define closefds_win FD_CLOSE
186	# define closefds_win_bit FD_CLOSE_BIT
187	# define connectfds_win FD_CONNECT
188	# define connectfds_win_bit FD_CONNECT_BIT
189
190	# define closefds_win FD_CLOSE
191	# define closefds_win_bit FD_CLOSE_BIT
192
193	# define DO_CHECK_FD_SET(so, events, fdset) \
194	(((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
195
196	# define DO_WIN_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
197	# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /specific for Unix API /
198
199	#endif /* RT_OS_WINDOWS */
200
201	#define TCP_ENGAGE_EVENT1(so, fdset) \
202	DO_ENGAGE_EVENT1((so), fdset, tcp)
203
204	#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
205	DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
206
207	#ifdef RT_OS_WINDOWS
208	# define WIN_TCP_ENGAGE_EVENT2(so, fdset, fdset2) TCP_ENGAGE_EVENT2(so, fdset1, fdset2)
209	#endif
210
211	#define UDP_ENGAGE_EVENT(so, fdset) \
212	DO_ENGAGE_EVENT1((so), fdset, udp)
213
214	#define POLL_TCP_EVENTS(rc, error, so, events) \
215	DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
216
217	#define POLL_UDP_EVENTS(rc, error, so, events) \
218	DO_POLL_EVENTS((rc), (error), (so), (events), udp)
219
220	#define CHECK_FD_SET(so, events, set) \
221	(DO_CHECK_FD_SET((so), (events), set))
222
223	#define WIN_CHECK_FD_SET(so, events, set) \
224	(DO_WIN_CHECK_FD_SET((so), (events), set))
225
226	/*
227	* Loging macros
228	*/
229	#if VBOX_WITH_DEBUG_NAT_SOCKETS
230	# if defined(RT_OS_WINDOWS)
231	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
232	do { \
233	LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
234	} while (0)
235	# else /* !RT_OS_WINDOWS */
236	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
237	do { \
238	LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
239	CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
240	CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
241	CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
242	CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
243	CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
244	CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
245	} while (0)
246	# endif /* !RT_OS_WINDOWS */
247	#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
248	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
249	#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
250
251	#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
252	DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
253
254	static void activate_port_forwarding(PNATState, const uint8_t *pEther);
255
256	static const uint8_t special_ethaddr[6] =
257	{
258	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
259	};
260
261	static const uint8_t broadcast_ethaddr[6] =
262	{
263	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
264	};
265
266	const uint8_t zerro_ethaddr[6] =
267	{
268	0x0, 0x0, 0x0, 0x0, 0x0, 0x0
269	};
270
271	/**
272	* This helper routine do the checks in descriptions to
273	* ''fUnderPolling'' and ''fShouldBeRemoved'' flags
274	* @returns 1 if socket removed and 0 if no changes was made.
275	*/
276	static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
277	{
278	AssertPtrReturn(pData, 0);
279	AssertPtrReturn(pSocket, 0);
280	AssertReturn(pSocket->fUnderPolling, 0);
281	if (pSocket->fShouldBeRemoved)
282	{
283	pSocket->fUnderPolling = 0;
284	sofree(pData, pSocket);
285	/* pSocket is PHANTOM, now */
286	return 1;
287	}
288	return 0;
289	}
290
291	int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
292	bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
293	int iIcmpCacheLimit, void *pvUser)
294	{
295	int rc;
296	PNATState pData;
297	if (u32Netmask & 0x1f)
298	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
299	return VERR_INVALID_PARAMETER;
300	pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
301	*ppData = pData;
302	if (!pData)
303	return VERR_NO_MEMORY;
304	pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
305	pData->fUseHostResolver = fUseHostResolver;
306	pData->pvUser = pvUser;
307	pData->netmask = u32Netmask;
308
309	/* sockets & TCP defaults */
310	pData->socket_rcv = 64 * _1K;
311	pData->socket_snd = 64 * _1K;
312	tcp_sndspace = 64 * _1K;
313	tcp_rcvspace = 64 * _1K;
314
315	/*
316	* Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
317	* to avoid release log noise.
318	*/
319	pData->soMaxConn = 10;
320
321	#ifdef RT_OS_WINDOWS
322	{
323	WSADATA Data;
324	WSAStartup(MAKEWORD(2, 0), &Data);
325	}
326	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
327	#endif
328
329	link_up = 1;
330
331	rc = bootp_dhcp_init(pData);
332	if (RT_FAILURE(rc))
333	{
334	Log(("NAT: DHCP server initialization failed\n"));
335	RTMemFree(pData);
336	*ppData = NULL;
337	return rc;
338	}
339	debug_init(pData);
340	if_init(pData);
341	ip_init(pData);
342	icmp_init(pData, iIcmpCacheLimit);
343
344	/* Initialise mbufs after setting the MTU */
345	mbuf_init(pData);
346
347	pData->special_addr.s_addr = u32NetAddr;
348	pData->slirp_ethaddr = &special_ethaddr[0];
349	alias_addr.s_addr = pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_ALIAS);
350	/* @todo: add ability to configure this staff */
351
352	/* set default addresses */
353	inet_aton("127.0.0.1", &loopback_addr);
354	rc = slirpInitializeDnsSettings(pData);
355	AssertRCReturn(rc, VINF_NAT_DNS);
356	rc = slirpTftpInit(pData);
357	AssertRCReturn(rc, VINF_NAT_DNS);
358
359	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
360	{
361	Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
362	i32AliasMode = 0;
363	}
364	pData->i32AliasMode = i32AliasMode;
365	getouraddr(pData);
366	{
367	int flags = 0;
368	struct in_addr proxy_addr;
369	pData->proxy_alias = LibAliasInit(pData, NULL);
370	if (pData->proxy_alias == NULL)
371	{
372	Log(("NAT: LibAlias default rule wasn't initialized\n"));
373	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
374	}
375	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
376	#ifndef NO_FW_PUNCH
377	flags \|= PKT_ALIAS_PUNCH_FW;
378	#endif
379	flags \|= pData->i32AliasMode; /* do transparent proxying */
380	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
381	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
382	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
383	ftp_alias_load(pData);
384	nbt_alias_load(pData);
385	if (pData->fUseHostResolver)
386	dns_alias_load(pData);
387	}
388	#ifdef VBOX_WITH_NAT_SEND2HOME
389	/* @todo: we should know all interfaces available on host. */
390	pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
391	pData->cInHomeAddressSize = 1;
392	inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
393	pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
394	# ifdef RT_OS_DARWIN
395	pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
396	# endif
397	#endif
398	return VINF_SUCCESS;
399	}
400
401	/**
402	* Register statistics.
403	*/
404	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
405	{
406	#ifdef VBOX_WITH_STATISTICS
407	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
408	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
409	# include "counters.h"
410	# undef COUNTER
411	/** @todo register statistics for the variables dumped by:
412	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
413	* mbufstats(pData); sockstats(pData); */
414	#else /* VBOX_WITH_STATISTICS */
415	NOREF(pData);
416	NOREF(pDrvIns);
417	#endif /* !VBOX_WITH_STATISTICS */
418	}
419
420	/**
421	* Deregister statistics.
422	*/
423	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
424	{
425	if (pData == NULL)
426	return;
427	#ifdef VBOX_WITH_STATISTICS
428	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
429	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
430	# include "counters.h"
431	#else /* VBOX_WITH_STATISTICS */
432	NOREF(pData);
433	NOREF(pDrvIns);
434	#endif /* !VBOX_WITH_STATISTICS */
435	}
436
437	/**
438	* Marks the link as up, making it possible to establish new connections.
439	*/
440	void slirp_link_up(PNATState pData)
441	{
442	struct arp_cache_entry *ac;
443	link_up = 1;
444
445	if (LIST_EMPTY(&pData->arp_cache))
446	return;
447
448	LIST_FOREACH(ac, &pData->arp_cache, list)
449	{
450	activate_port_forwarding(pData, ac->ether);
451	}
452	}
453
454	/**
455	* Marks the link as down and cleans up the current connections.
456	*/
457	void slirp_link_down(PNATState pData)
458	{
459	struct socket *so;
460	struct port_forward_rule *rule;
461
462	while ((so = tcb.so_next) != &tcb)
463	{
464	/* Don't miss TCB releasing */
465	if ( !sototcpcb(so)
466	&& ( so->so_state & SS_NOFDREF
467	\|\| so->s == -1))
468	sofree(pData, so);
469	else
470	tcp_close(pData, sototcpcb(so));
471	}
472
473	while ((so = udb.so_next) != &udb)
474	udp_detach(pData, so);
475
476	/*
477	* Clear the active state of port-forwarding rules to force
478	* re-setup on restoration of communications.
479	*/
480	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
481	{
482	rule->activated = 0;
483	}
484	pData->cRedirectionsActive = 0;
485
486	link_up = 0;
487	}
488
489	/**
490	* Terminates the slirp component.
491	*/
492	void slirp_term(PNATState pData)
493	{
494	if (pData == NULL)
495	return;
496	icmp_finit(pData);
497
498	slirp_link_down(pData);
499	slirpReleaseDnsSettings(pData);
500	ftp_alias_unload(pData);
501	nbt_alias_unload(pData);
502	if (pData->fUseHostResolver)
503	{
504	dns_alias_unload(pData);
505	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
506	while (!LIST_EMPTY(&pData->DNSMapHead))
507	{
508	PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
509	LIST_REMOVE(pDnsEntry, MapList);
510	RTStrFree(pDnsEntry->pszCName);
511	RTMemFree(pDnsEntry);
512	}
513	#endif
514	}
515	while (!LIST_EMPTY(&instancehead))
516	{
517	struct libalias *la = LIST_FIRST(&instancehead);
518	/* libalias do all clean up */
519	LibAliasUninit(la);
520	}
521	while (!LIST_EMPTY(&pData->arp_cache))
522	{
523	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
524	LIST_REMOVE(ac, list);
525	RTMemFree(ac);
526	}
527	slirpTftpTerm(pData);
528	bootp_dhcp_fini(pData);
529	m_fini(pData);
530	#ifdef RT_OS_WINDOWS
531	WSACleanup();
532	#endif
533	#ifndef VBOX_WITH_SLIRP_BSD_SBUF
534	#ifdef LOG_ENABLED
535	Log(("\n"
536	"NAT statistics\n"
537	"--------------\n"
538	"\n"));
539	ipstats(pData);
540	tcpstats(pData);
541	udpstats(pData);
542	icmpstats(pData);
543	mbufstats(pData);
544	sockstats(pData);
545	Log(("\n"
546	"\n"
547	"\n"));
548	#endif
549	#endif
550	RTMemFree(pData);
551	}
552
553
554	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
555	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
556
557	/*
558	* curtime kept to an accuracy of 1ms
559	*/
560	static void updtime(PNATState pData)
561	{
562	#ifdef RT_OS_WINDOWS
563	struct _timeb tb;
564
565	_ftime(&tb);
566	curtime = (u_int)tb.time * (u_int)1000;
567	curtime += (u_int)tb.millitm;
568	#else
569	gettimeofday(&tt, 0);
570
571	curtime = (u_int)tt.tv_sec * (u_int)1000;
572	curtime += (u_int)tt.tv_usec / (u_int)1000;
573
574	if ((tt.tv_usec % 1000) >= 500)
575	curtime++;
576	#endif
577	}
578
579	#ifdef RT_OS_WINDOWS
580	void slirp_select_fill(PNATState pData, int *pnfds)
581	#else /* RT_OS_WINDOWS */
582	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
583	#endif /* !RT_OS_WINDOWS */
584	{
585	struct socket so, so_next;
586	int nfds;
587	#if defined(RT_OS_WINDOWS)
588	int rc;
589	int error;
590	#else
591	int poll_index = 0;
592	#endif
593	int i;
594
595	STAM_PROFILE_START(&pData->StatFill, a);
596
597	nfds = *pnfds;
598
599	/*
600	* First, TCP sockets
601	*/
602	do_slowtimo = 0;
603	if (!link_up)
604	goto done;
605
606	/*
607	* *_slowtimo needs calling if there are IP fragments
608	* in the fragment queue, or there are TCP connections active
609	*/
610	/* XXX:
611	* triggering of fragment expiration should be the same but use new macroses
612	*/
613	do_slowtimo = (tcb.so_next != &tcb);
614	if (!do_slowtimo)
615	{
616	for (i = 0; i < IPREASS_NHASH; i++)
617	{
618	if (!TAILQ_EMPTY(&ipq[i]))
619	{
620	do_slowtimo = 1;
621	break;
622	}
623	}
624	}
625	/* always add the ICMP socket */
626	#ifndef RT_OS_WINDOWS
627	pData->icmp_socket.so_poll_index = -1;
628	#endif
629	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
630
631	STAM_COUNTER_RESET(&pData->StatTCP);
632	STAM_COUNTER_RESET(&pData->StatTCPHot);
633
634	QSOCKET_FOREACH(so, so_next, tcp)
635	/* { */
636	Assert(so->so_type == IPPROTO_TCP);
637	#if !defined(RT_OS_WINDOWS)
638	so->so_poll_index = -1;
639	#endif
640	STAM_COUNTER_INC(&pData->StatTCP);
641	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
642	/* TCP socket can't be cloned */
643	Assert((!so->so_cloneOf));
644	#endif
645	/*
646	* See if we need a tcp_fasttimo
647	*/
648	if ( time_fasttimo == 0
649	&& so->so_tcpcb != NULL
650	&& so->so_tcpcb->t_flags & TF_DELACK)
651	{
652	time_fasttimo = curtime; /* Flag when we want a fasttimo */
653	}
654
655	/*
656	* NOFDREF can include still connecting to local-host,
657	* newly socreated() sockets etc. Don't want to select these.
658	*/
659	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
660	CONTINUE(tcp);
661
662	/*
663	* Set for reading sockets which are accepting
664	*/
665	if (so->so_state & SS_FACCEPTCONN)
666	{
667	STAM_COUNTER_INC(&pData->StatTCPHot);
668	TCP_ENGAGE_EVENT1(so, readfds);
669	CONTINUE(tcp);
670	}
671
672	/*
673	* Set for writing sockets which are connecting
674	*/
675	if (so->so_state & SS_ISFCONNECTING)
676	{
677	Log2(("connecting %R[natsock] engaged\n",so));
678	STAM_COUNTER_INC(&pData->StatTCPHot);
679	#ifdef RT_OS_WINDOWS
680	WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
681	#else
682	TCP_ENGAGE_EVENT1(so, writefds);
683	#endif
684	}
685
686	/*
687	* Set for writing if we are connected, can send more, and
688	* we have something to send
689	*/
690	if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
691	{
692	STAM_COUNTER_INC(&pData->StatTCPHot);
693	TCP_ENGAGE_EVENT1(so, writefds);
694	}
695
696	/*
697	* Set for reading (and urgent data) if we are connected, can
698	* receive more, and we have room for it XXX /2 ?
699	*/
700	/* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
701	if ( CONN_CANFRCV(so)
702	&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
703	#ifdef RT_OS_WINDOWS
704	&& !(so->so_state & SS_ISFCONNECTING)
705	#endif
706	)
707	{
708	STAM_COUNTER_INC(&pData->StatTCPHot);
709	TCP_ENGAGE_EVENT2(so, readfds, xfds);
710	}
711	LOOP_LABEL(tcp, so, so_next);
712	}
713
714	/*
715	* UDP sockets
716	*/
717	STAM_COUNTER_RESET(&pData->StatUDP);
718	STAM_COUNTER_RESET(&pData->StatUDPHot);
719
720	QSOCKET_FOREACH(so, so_next, udp)
721	/* { */
722
723	Assert(so->so_type == IPPROTO_UDP);
724	STAM_COUNTER_INC(&pData->StatUDP);
725	#if !defined(RT_OS_WINDOWS)
726	so->so_poll_index = -1;
727	#endif
728
729	/*
730	* See if it's timed out
731	*/
732	if (so->so_expire)
733	{
734	if (so->so_expire <= curtime)
735	{
736	Log2(("NAT: %R[natsock] expired\n", so));
737	if (so->so_timeout != NULL)
738	{
739	so->so_timeout(pData, so, so->so_timeout_arg);
740	}
741	UDP_DETACH(pData, so, so_next);
742	CONTINUE_NO_UNLOCK(udp);
743	}
744	}
745	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
746	if (so->so_cloneOf)
747	CONTINUE_NO_UNLOCK(udp);
748	#endif
749
750	/*
751	* When UDP packets are received from over the link, they're
752	* sendto()'d straight away, so no need for setting for writing
753	* Limit the number of packets queued by this session to 4.
754	* Note that even though we try and limit this to 4 packets,
755	* the session could have more queued if the packets needed
756	* to be fragmented.
757	*
758	* (XXX <= 4 ?)
759	*/
760	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
761	{
762	STAM_COUNTER_INC(&pData->StatUDPHot);
763	UDP_ENGAGE_EVENT(so, readfds);
764	}
765	LOOP_LABEL(udp, so, so_next);
766	}
767	done:
768
769	#if defined(RT_OS_WINDOWS)
770	*pnfds = VBOX_EVENT_COUNT;
771	#else /* RT_OS_WINDOWS */
772	AssertRelease(poll_index <= *pnfds);
773	*pnfds = poll_index;
774	#endif /* !RT_OS_WINDOWS */
775
776	STAM_PROFILE_STOP(&pData->StatFill, a);
777	}
778
779
780	/**
781	* This function do Connection or sending tcp sequence to.
782	* @returns if true operation completed
783	* @note: functions call tcp_input that potentially could lead to tcp_drop
784	*/
785	static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
786	{
787	int ret;
788	LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
789	/*
790	* Check for non-blocking, still-connecting sockets
791	*/
792	if (so->so_state & SS_ISFCONNECTING)
793	{
794	Log2(("connecting %R[natsock] catched\n", so));
795	/* Connected */
796	so->so_state &= ~SS_ISFCONNECTING;
797
798	/*
799	* This should be probably guarded by PROBE_CONN too. Anyway,
800	* we disable it on OS/2 because the below send call returns
801	* EFAULT which causes the opened TCP socket to close right
802	* after it has been opened and connected.
803	*/
804	#ifndef RT_OS_OS2
805	ret = send(so->s, (const char *)&ret, 0, 0);
806	if (ret < 0)
807	{
808	/* XXXXX Must fix, zero bytes is a NOP */
809	if ( soIgnorableErrorCode(errno)
810	\|\| errno == ENOTCONN)
811	{
812	LogFlowFunc(("LEAVE: false\n"));
813	return false;
814	}
815
816	/* else failed */
817	so->so_state = SS_NOFDREF;
818	}
819	/* else so->so_state &= ~SS_ISFCONNECTING; */
820	#endif
821
822	/*
823	* Continue tcp_input
824	*/
825	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
826	/* continue; */
827	}
828	else if (!fConnectOnly)
829	SOWRITE(ret, pData, so);
830	/*
831	* XXX If we wrote something (a lot), there could be the need
832	* for a window update. In the worst case, the remote will send
833	* a window probe to get things going again.
834	*/
835	LogFlowFunc(("LEAVE: true\n"));
836	return true;
837	}
838
839	#if defined(RT_OS_WINDOWS)
840	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
841	#else /* RT_OS_WINDOWS */
842	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
843	#endif /* !RT_OS_WINDOWS */
844	{
845	struct socket so, so_next;
846	int ret;
847	#if defined(RT_OS_WINDOWS)
848	WSANETWORKEVENTS NetworkEvents;
849	int rc;
850	int error;
851	#endif
852
853	STAM_PROFILE_START(&pData->StatPoll, a);
854
855	/* Update time */
856	updtime(pData);
857
858	/*
859	* See if anything has timed out
860	*/
861	if (link_up)
862	{
863	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
864	{
865	STAM_PROFILE_START(&pData->StatFastTimer, b);
866	tcp_fasttimo(pData);
867	time_fasttimo = 0;
868	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
869	}
870	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
871	{
872	STAM_PROFILE_START(&pData->StatSlowTimer, c);
873	ip_slowtimo(pData);
874	tcp_slowtimo(pData);
875	last_slowtimo = curtime;
876	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
877	}
878	}
879	#if defined(RT_OS_WINDOWS)
880	if (fTimeout)
881	return; /* only timer update */
882	#endif
883
884	/*
885	* Check sockets
886	*/
887	if (!link_up)
888	goto done;
889	#if defined(RT_OS_WINDOWS)
890	/*XXX: before renaming please make see define
891	* fIcmp in slirp_state.h
892	*/
893	if (fIcmp)
894	sorecvfrom(pData, &pData->icmp_socket);
895	#else
896	if ( (pData->icmp_socket.s != -1)
897	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
898	sorecvfrom(pData, &pData->icmp_socket);
899	#endif
900	/*
901	* Check TCP sockets
902	*/
903	QSOCKET_FOREACH(so, so_next, tcp)
904	/* { */
905	/* TCP socket can't be cloned */
906	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
907	Assert((!so->so_cloneOf));
908	#endif
909	Assert(!so->fUnderPolling);
910	so->fUnderPolling = 1;
911	if (slirpVerifyAndFreeSocket(pData, so))
912	CONTINUE(tcp);
913	/*
914	* FD_ISSET is meaningless on these sockets
915	* (and they can crash the program)
916	*/
917	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
918	{
919	so->fUnderPolling = 0;
920	CONTINUE(tcp);
921	}
922
923	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
924
925	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
926
927
928	/*
929	* Check for URG data
930	* This will soread as well, so no need to
931	* test for readfds below if this succeeds
932	*/
933
934	/* out-of-band data */
935	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
936	#ifdef RT_OS_DARWIN
937	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
938	* combination on other Unixs hosts doesn't enter to this branch
939	*/
940	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
941	#endif
942	#ifdef RT_OS_WINDOWS
943	/**
944	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
945	*/
946	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
947	#endif
948	)
949	{
950	sorecvoob(pData, so);
951	if (slirpVerifyAndFreeSocket(pData, so))
952	CONTINUE(tcp);
953	}
954
955	/*
956	* Check sockets for reading
957	*/
958	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
959	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
960	{
961
962	#ifdef RT_OS_WINDOWS
963	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
964	{
965	/* Finish connection first */
966	/* should we ignore return value? */
967	bool fRet = slirpConnectOrWrite(pData, so, true);
968	LogFunc(("fRet:%RTbool\n", fRet));
969	if (slirpVerifyAndFreeSocket(pData, so))
970	CONTINUE(tcp);
971	}
972	#endif
973	/*
974	* Check for incoming connections
975	*/
976	if (so->so_state & SS_FACCEPTCONN)
977	{
978	TCP_CONNECT(pData, so);
979	if (slirpVerifyAndFreeSocket(pData, so))
980	CONTINUE(tcp);
981	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
982	{
983	so->fUnderPolling = 0;
984	CONTINUE(tcp);
985	}
986	}
987
988	ret = soread(pData, so);
989	if (slirpVerifyAndFreeSocket(pData, so))
990	CONTINUE(tcp);
991	/* Output it if we read something */
992	if (RT_LIKELY(ret > 0))
993	TCP_OUTPUT(pData, sototcpcb(so));
994
995	if (slirpVerifyAndFreeSocket(pData, so))
996	CONTINUE(tcp);
997	}
998
999	/*
1000	* Check for FD_CLOSE events.
1001	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1002	*/
1003	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1004	\|\| (so->so_close == 1))
1005	{
1006	/*
1007	* drain the socket
1008	*/
1009	for (; so_next->so_prev == so
1010	&& !slirpVerifyAndFreeSocket(pData, so);)
1011	{
1012	ret = soread(pData, so);
1013	if (slirpVerifyAndFreeSocket(pData, so))
1014	break;
1015
1016	if (ret > 0)
1017	TCP_OUTPUT(pData, sototcpcb(so));
1018	else if (so_next->so_prev == so)
1019	{
1020	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1021	break;
1022	}
1023	}
1024
1025	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1026	if (so_next->so_prev == so)
1027	{
1028	/* mark the socket for termination _after_ it was drained */
1029	so->so_close = 1;
1030	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1031	* Actually in the specific error scenario, POLLERR is set as well. */
1032	#ifndef RT_OS_WINDOWS
1033	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1034	sofcantsendmore(so);
1035	#endif
1036	}
1037	if (so_next->so_prev == so)
1038	so->fUnderPolling = 0;
1039	CONTINUE(tcp);
1040	}
1041
1042	/*
1043	* Check sockets for writing
1044	*/
1045	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1046	#ifdef RT_OS_WINDOWS
1047	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1048	#endif
1049	)
1050	{
1051	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1052	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1053	* so we should be ready to such situations.
1054	*/
1055	if (slirpVerifyAndFreeSocket(pData, so))
1056	CONTINUE(tcp);
1057	else if (!fConnectOrWriteSuccess)
1058	{
1059	so->fUnderPolling = 0;
1060	CONTINUE(tcp);
1061	}
1062	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1063	}
1064
1065	/*
1066	* Probe a still-connecting, non-blocking socket
1067	* to check if it's still alive
1068	*/
1069	#ifdef PROBE_CONN
1070	if (so->so_state & SS_ISFCONNECTING)
1071	{
1072	ret = recv(so->s, (char *)&ret, 0, 0);
1073
1074	if (ret < 0)
1075	{
1076	/* XXX */
1077	if ( soIgnorableErrorCode(errno)
1078	\|\| errno == ENOTCONN)
1079	{
1080	CONTINUE(tcp); /* Still connecting, continue */
1081	}
1082
1083	/* else failed */
1084	so->so_state = SS_NOFDREF;
1085
1086	/* tcp_input will take care of it */
1087	}
1088	else
1089	{
1090	ret = send(so->s, &ret, 0, 0);
1091	if (ret < 0)
1092	{
1093	/* XXX */
1094	if ( soIgnorableErrorCode(errno)
1095	\|\| errno == ENOTCONN)
1096	{
1097	CONTINUE(tcp);
1098	}
1099	/* else failed */
1100	so->so_state = SS_NOFDREF;
1101	}
1102	else
1103	so->so_state &= ~SS_ISFCONNECTING;
1104
1105	}
1106	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1107	} /* SS_ISFCONNECTING */
1108	#endif
1109	if (!slirpVerifyAndFreeSocket(pData, so))
1110	so->fUnderPolling = 0;
1111	LOOP_LABEL(tcp, so, so_next);
1112	}
1113
1114	/*
1115	* Now UDP sockets.
1116	* Incoming packets are sent straight away, they're not buffered.
1117	* Incoming UDP data isn't buffered either.
1118	*/
1119	QSOCKET_FOREACH(so, so_next, udp)
1120	/* { */
1121	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1122	if (so->so_cloneOf)
1123	CONTINUE_NO_UNLOCK(udp);
1124	#endif
1125	#if 0
1126	so->fUnderPolling = 1;
1127	if(slirpVerifyAndFreeSocket(pData, so));
1128	CONTINUE(udp);
1129	so->fUnderPolling = 0;
1130	#endif
1131
1132	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1133
1134	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1135
1136	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1137	{
1138	SORECVFROM(pData, so);
1139	}
1140	LOOP_LABEL(udp, so, so_next);
1141	}
1142
1143	done:
1144
1145	STAM_PROFILE_STOP(&pData->StatPoll, a);
1146	}
1147
1148
1149	struct arphdr
1150	{
1151	unsigned short ar_hrd; /* format of hardware address */
1152	unsigned short ar_pro; /* format of protocol address */
1153	unsigned char ar_hln; /* length of hardware address */
1154	unsigned char ar_pln; /* length of protocol address */
1155	unsigned short ar_op; /* ARP opcode (command) */
1156
1157	/*
1158	* Ethernet looks like this : This bit is variable sized however...
1159	*/
1160	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1161	unsigned char ar_sip[4]; /* sender IP address */
1162	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1163	unsigned char ar_tip[4]; /* target IP address */
1164	};
1165	AssertCompileSize(struct arphdr, 28);
1166
1167	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1168	{
1169	struct ethhdr *pEtherHeaderResponse;
1170	struct arphdr *pARPHeaderResponse;
1171	uint32_t ip4TargetAddressInHostFormat;
1172	struct mbuf *pMbufResponse;
1173
1174	Assert((pcu8EtherSource));
1175	if (!pcu8EtherSource)
1176	return;
1177	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1178
1179	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1180	if (!pMbufResponse)
1181	return;
1182	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1183	/* @note: if_encap will swap src and dst*/
1184	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1185	pMbufResponse->m_data += ETH_HLEN;
1186	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1187	pMbufResponse->m_len = sizeof(struct arphdr);
1188
1189	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1190	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1191	pARPHeaderResponse->ar_hln = ETH_ALEN;
1192	pARPHeaderResponse->ar_pln = 4;
1193	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1194	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1195
1196	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1197	{
1198	static bool fTagErrorReported;
1199	if (!fTagErrorReported)
1200	{
1201	LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
1202	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1203	fTagErrorReported = true;
1204	}
1205	}
1206	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1207
1208	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1209	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1210	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1211	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1212	}
1213	/**
1214	* @note This function will free m!
1215	*/
1216	static void arp_input(PNATState pData, struct mbuf *m)
1217	{
1218	struct ethhdr *pEtherHeader;
1219	struct arphdr *pARPHeader;
1220	uint32_t ip4TargetAddress;
1221
1222	int ar_op;
1223	pEtherHeader = mtod(m, struct ethhdr *);
1224	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1225
1226	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1227	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1228
1229	switch (ar_op)
1230	{
1231	case ARPOP_REQUEST:
1232	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1233	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1234	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1235	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1236
1237	/* Gratuitous ARP */
1238	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1239	&& memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1240	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1241	{
1242	/* We've received an announce about address assignment,
1243	* let's do an ARP cache update
1244	*/
1245	static bool fGratuitousArpReported;
1246	if (!fGratuitousArpReported)
1247	{
1248	LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
1249	pARPHeader->ar_sip, pARPHeader->ar_sha));
1250	fGratuitousArpReported = true;
1251	}
1252	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1253	}
1254	break;
1255
1256	case ARPOP_REPLY:
1257	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1258	break;
1259
1260	default:
1261	break;
1262	}
1263
1264	m_freem(pData, m);
1265	}
1266
1267	/**
1268	* Feed a packet into the slirp engine.
1269	*
1270	* @param m Data buffer, m_len is not valid.
1271	* @param cbBuf The length of the data in m.
1272	*/
1273	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1274	{
1275	int proto;
1276	static bool fWarnedIpv6;
1277	struct ethhdr *eh;
1278	uint8_t au8Ether[ETH_ALEN];
1279
1280	m->m_len = cbBuf;
1281	if (cbBuf < ETH_HLEN)
1282	{
1283	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1284	m_freem(pData, m);
1285	return;
1286	}
1287	eh = mtod(m, struct ethhdr *);
1288	proto = RT_N2H_U16(eh->h_proto);
1289
1290	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1291
1292	switch(proto)
1293	{
1294	case ETH_P_ARP:
1295	arp_input(pData, m);
1296	break;
1297
1298	case ETH_P_IP:
1299	/* Update time. Important if the network is very quiet, as otherwise
1300	* the first outgoing connection gets an incorrect timestamp. */
1301	updtime(pData);
1302	m_adj(m, ETH_HLEN);
1303	M_ASSERTPKTHDR(m);
1304	m->m_pkthdr.header = mtod(m, void *);
1305	ip_input(pData, m);
1306	break;
1307
1308	case ETH_P_IPV6:
1309	m_freem(pData, m);
1310	if (!fWarnedIpv6)
1311	{
1312	LogRel(("NAT: IPv6 not supported\n"));
1313	fWarnedIpv6 = true;
1314	}
1315	break;
1316
1317	default:
1318	Log(("NAT: Unsupported protocol %x\n", proto));
1319	m_freem(pData, m);
1320	break;
1321	}
1322
1323	if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1324	activate_port_forwarding(pData, au8Ether);
1325	}
1326
1327	/**
1328	* Output the IP packet to the ethernet device.
1329	*
1330	* @note This function will free m!
1331	*/
1332	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1333	{
1334	struct ethhdr *eh;
1335	uint8_t *mbuf = NULL;
1336	size_t mlen = 0;
1337	STAM_PROFILE_START(&pData->StatIF_encap, a);
1338	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1339	pData, eth_proto, m, flags));
1340
1341	M_ASSERTPKTHDR(m);
1342	m->m_data -= ETH_HLEN;
1343	m->m_len += ETH_HLEN;
1344	eh = mtod(m, struct ethhdr *);
1345	mlen = m->m_len;
1346
1347	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1348	{
1349	struct m_tag *t = m_tag_first(m);
1350	uint8_t u8ServiceId = CTL_ALIAS;
1351	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1352	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1353	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1354	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1355	{
1356	/* don't do anything */
1357	m_freem(pData, m);
1358	goto done;
1359	}
1360	if ( t
1361	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1362	{
1363	Assert(t);
1364	u8ServiceId = (uint8_t )&t[1];
1365	}
1366	eh->h_source[5] = u8ServiceId;
1367	}
1368	/*
1369	* we're processing the chain, that isn't not expected.
1370	*/
1371	Assert((!m->m_next));
1372	if (m->m_next)
1373	{
1374	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1375	m_freem(pData, m);
1376	goto done;
1377	}
1378	mbuf = mtod(m, uint8_t *);
1379	eh->h_proto = RT_H2N_U16(eth_proto);
1380	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1381	if (flags & ETH_ENCAP_URG)
1382	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1383	else
1384	slirp_output(pData->pvUser, m, mbuf, mlen);
1385	done:
1386	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1387	LogFlowFuncLeave();
1388	}
1389
1390	/**
1391	* Still we're using dhcp server leasing to map ether to IP
1392	* @todo see rt_lookup_in_cache
1393	*/
1394	static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1395	{
1396	uint32_t ip = INADDR_ANY;
1397	int rc;
1398
1399	if (eth_addr == NULL)
1400	return INADDR_ANY;
1401
1402	if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1403	\|\| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1404	return INADDR_ANY;
1405
1406	rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1407	if (RT_SUCCESS(rc))
1408	return ip;
1409
1410	bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1411	/* ignore return code, ip will be set to INADDR_ANY on error */
1412	return ip;
1413	}
1414
1415	/**
1416	* We need check if we've activated port forwarding
1417	* for specific machine ... that of course relates to
1418	* service mode
1419	* @todo finish this for service case
1420	*/
1421	static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1422	{
1423	struct port_forward_rule rule, tmp;
1424	const uint8_t *pu8EthSource = h_source;
1425
1426	/* check mac here */
1427	LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1428	{
1429	struct socket *so;
1430	struct alias_link *alias_link;
1431	struct libalias *lib;
1432	int flags;
1433	struct sockaddr sa;
1434	struct sockaddr_in *psin;
1435	socklen_t socketlen;
1436	struct in_addr alias;
1437	int rc;
1438	uint32_t guest_addr; /* need to understand if we already give address to guest */
1439
1440	if (rule->activated)
1441	continue;
1442
1443	#ifdef VBOX_WITH_NAT_SERVICE
1444	/**
1445	* case when guest ip is INADDR_ANY shouldn't appear in NAT service
1446	*/
1447	Assert((rule->guest_addr.s_addr != INADDR_ANY));
1448	guest_addr = rule->guest_addr.s_addr;
1449	#else /* VBOX_WITH_NAT_SERVICE */
1450	guest_addr = find_guest_ip(pData, pu8EthSource);
1451	#endif /* !VBOX_WITH_NAT_SERVICE */
1452	if (guest_addr == INADDR_ANY)
1453	{
1454	/* the address wasn't granted */
1455	return;
1456	}
1457
1458	#if !defined(VBOX_WITH_NAT_SERVICE)
1459	if ( rule->guest_addr.s_addr != guest_addr
1460	&& rule->guest_addr.s_addr != INADDR_ANY)
1461	continue;
1462	if (rule->guest_addr.s_addr == INADDR_ANY)
1463	rule->guest_addr.s_addr = guest_addr;
1464	#endif
1465
1466	LogRel(("NAT: set redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1467	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1468
1469	if (rule->proto == IPPROTO_UDP)
1470	so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1471	RT_H2N_U16(rule->guest_port), 0);
1472	else
1473	so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1474	RT_H2N_U16(rule->guest_port), 0);
1475
1476	if (so == NULL)
1477	goto remove_port_forwarding;
1478
1479	psin = (struct sockaddr_in *)&sa;
1480	psin->sin_family = AF_INET;
1481	psin->sin_port = 0;
1482	psin->sin_addr.s_addr = INADDR_ANY;
1483	socketlen = sizeof(struct sockaddr);
1484
1485	rc = getsockname(so->s, &sa, &socketlen);
1486	if (rc < 0 \|\| sa.sa_family != AF_INET)
1487	goto remove_port_forwarding;
1488
1489	psin = (struct sockaddr_in *)&sa;
1490
1491	lib = LibAliasInit(pData, NULL);
1492	flags = LibAliasSetMode(lib, 0, 0);
1493	flags \|= pData->i32AliasMode;
1494	flags \|= PKT_ALIAS_REVERSE; /* set reverse */
1495	flags = LibAliasSetMode(lib, flags, ~0);
1496
1497	alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) \| CTL_ALIAS);
1498	alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
1499	alias, RT_H2N_U16(rule->guest_port),
1500	pData->special_addr, -1, /* not very clear for now */
1501	rule->proto);
1502	if (!alias_link)
1503	goto remove_port_forwarding;
1504
1505	so->so_la = lib;
1506	rule->activated = 1;
1507	rule->so = so;
1508	pData->cRedirectionsActive++;
1509	continue;
1510
1511	remove_port_forwarding:
1512	LogRel(("NAT: failed to redirect %s %d => %d\n",
1513	(rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
1514	LIST_REMOVE(rule, list);
1515	pData->cRedirectionsStored--;
1516	RTMemFree(rule);
1517	}
1518	}
1519
1520	/**
1521	* Changes in 3.1 instead of opening new socket do the following:
1522	* gain more information:
1523	* 1. bind IP
1524	* 2. host port
1525	* 3. guest port
1526	* 4. proto
1527	* 5. guest MAC address
1528	* the guest's MAC address is rather important for service, but we easily
1529	* could get it from VM configuration in DrvNAT or Service, the idea is activating
1530	* corresponding port-forwarding
1531	*/
1532	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1533	struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1534	{
1535	struct port_forward_rule *rule = NULL;
1536	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1537	{
1538	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1539	&& rule->host_port == host_port
1540	&& rule->bind_ip.s_addr == host_addr.s_addr
1541	&& rule->guest_port == guest_port
1542	&& rule->guest_addr.s_addr == guest_addr.s_addr
1543	)
1544	return 0; /* rule has been already registered */
1545	}
1546
1547	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1548	if (rule == NULL)
1549	return 1;
1550
1551	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1552	rule->host_port = host_port;
1553	rule->guest_port = guest_port;
1554	rule->guest_addr.s_addr = guest_addr.s_addr;
1555	rule->bind_ip.s_addr = host_addr.s_addr;
1556	if (ethaddr != NULL)
1557	memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1558	/* @todo add mac address */
1559	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1560	pData->cRedirectionsStored++;
1561	/* activate port-forwarding if guest has already got assigned IP */
1562	if ( ethaddr
1563	&& memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
1564	activate_port_forwarding(pData, ethaddr);
1565	return 0;
1566	}
1567
1568	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1569	struct in_addr guest_addr, int guest_port)
1570	{
1571	struct port_forward_rule *rule = NULL;
1572	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1573	{
1574	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1575	&& rule->host_port == host_port
1576	&& rule->guest_port == guest_port
1577	&& rule->bind_ip.s_addr == host_addr.s_addr
1578	&& rule->guest_addr.s_addr == guest_addr.s_addr
1579	&& rule->activated)
1580	{
1581	LogRel(("NAT: remove redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1582	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1583
1584	LibAliasUninit(rule->so->so_la);
1585	if (is_udp)
1586	udp_detach(pData, rule->so);
1587	else
1588	tcp_close(pData, sototcpcb(rule->so));
1589	LIST_REMOVE(rule, list);
1590	RTMemFree(rule);
1591	pData->cRedirectionsStored--;
1592	break;
1593	}
1594
1595	}
1596	return 0;
1597	}
1598
1599	void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1600	{
1601	#ifndef VBOX_WITH_NAT_SERVICE
1602	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1603	#endif
1604	if (GuestIP != INADDR_ANY)
1605	{
1606	slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1607	activate_port_forwarding(pData, ethaddr);
1608	}
1609	}
1610
1611	#if defined(RT_OS_WINDOWS)
1612	HANDLE *slirp_get_events(PNATState pData)
1613	{
1614	return pData->phEvents;
1615	}
1616	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1617	{
1618	pData->phEvents[index] = hEvent;
1619	}
1620	#endif
1621
1622	unsigned int slirp_get_timeout_ms(PNATState pData)
1623	{
1624	if (link_up)
1625	{
1626	if (time_fasttimo)
1627	return 2;
1628	if (do_slowtimo)
1629	return 500; /* see PR_SLOWHZ */
1630	}
1631	return 36001000; / one hour */
1632	}
1633
1634	#ifndef RT_OS_WINDOWS
1635	int slirp_get_nsock(PNATState pData)
1636	{
1637	return pData->nsock;
1638	}
1639	#endif
1640
1641	/*
1642	* this function called from NAT thread
1643	*/
1644	void slirp_post_sent(PNATState pData, void *pvArg)
1645	{
1646	struct mbuf m = (struct mbuf )pvArg;
1647	m_freem(pData, m);
1648	}
1649
1650	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1651	{
1652	Log2(("tftp_prefix: %s\n", tftpPrefix));
1653	tftp_prefix = tftpPrefix;
1654	}
1655
1656	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1657	{
1658	Log2(("bootFile: %s\n", bootFile));
1659	bootp_filename = bootFile;
1660	}
1661
1662	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1663	{
1664	Log2(("next_server: %s\n", next_server));
1665	if (next_server == NULL)
1666	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1667	else
1668	inet_aton(next_server, &pData->tftp_server);
1669	}
1670
1671	int slirp_set_binding_address(PNATState pData, char *addr)
1672	{
1673	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1674	{
1675	pData->bindIP.s_addr = INADDR_ANY;
1676	return 1;
1677	}
1678	return 0;
1679	}
1680
1681	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1682	{
1683	if (!pData->fUseHostResolver)
1684	{
1685	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1686	pData->fUseDnsProxy = fDNSProxy;
1687	}
1688	else if (fDNSProxy)
1689	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1690	}
1691
1692	#define CHECK_ARG(name, val, lim_min, lim_max) \
1693	do { \
1694	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1695	{ \
1696	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1697	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1698	return; \
1699	} \
1700	else \
1701	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1702	} while (0)
1703
1704	void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1705	{
1706	LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
1707	/* Conditions */
1708	if (iSoMaxConn > SOMAXCONN)
1709	{
1710	LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1711	iSoMaxConn = SOMAXCONN;
1712	}
1713
1714	if (iSoMaxConn < 1)
1715	{
1716	LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1717	LogFlowFuncLeave();
1718	return;
1719	}
1720
1721	/* Asignment */
1722	if (pData->soMaxConn != iSoMaxConn)
1723	{
1724	LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1725	pData->soMaxConn, iSoMaxConn));
1726	pData->soMaxConn = iSoMaxConn;
1727	}
1728	LogFlowFuncLeave();
1729	}
1730	/* don't allow user set less 8kB and more than 1M values */
1731	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1732	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1733	{
1734	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1735	pData->socket_rcv = kilobytes;
1736	}
1737	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1738	{
1739	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1740	pData->socket_snd = kilobytes * _1K;
1741	}
1742	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1743	{
1744	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1745	tcp_rcvspace = kilobytes * _1K;
1746	}
1747	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1748	{
1749	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1750	tcp_sndspace = kilobytes * _1K;
1751	}
1752
1753	/*
1754	* Looking for Ether by ip in ARP-cache
1755	* Note: it´s responsible of caller to allocate buffer for result
1756	* @returns iprt status code
1757	*/
1758	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1759	{
1760	struct arp_cache_entry *ac;
1761
1762	if (ether == NULL)
1763	return VERR_INVALID_PARAMETER;
1764
1765	if (LIST_EMPTY(&pData->arp_cache))
1766	return VERR_NOT_FOUND;
1767
1768	LIST_FOREACH(ac, &pData->arp_cache, list)
1769	{
1770	if ( ac->ip == ip
1771	&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1772	{
1773	memcpy(ether, ac->ether, ETH_ALEN);
1774	return VINF_SUCCESS;
1775	}
1776	}
1777	return VERR_NOT_FOUND;
1778	}
1779
1780	/*
1781	* Looking for IP by Ether in ARP-cache
1782	* Note: it´s responsible of caller to allocate buffer for result
1783	* @returns 0 - if found, 1 - otherwise
1784	*/
1785	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1786	{
1787	struct arp_cache_entry *ac;
1788	*ip = INADDR_ANY;
1789
1790	if (LIST_EMPTY(&pData->arp_cache))
1791	return VERR_NOT_FOUND;
1792
1793	LIST_FOREACH(ac, &pData->arp_cache, list)
1794	{
1795	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1796	{
1797	*ip = ac->ip;
1798	return VINF_SUCCESS;
1799	}
1800	}
1801	return VERR_NOT_FOUND;
1802	}
1803
1804	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1805	{
1806	struct mbuf *m;
1807	struct ethhdr *ehdr;
1808	struct arphdr *ahdr;
1809	static bool fWarned = false;
1810	LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1811
1812	/* ARP request WHO HAS 0.0.0.0 is one of the signals
1813	* that something has been broken at Slirp. Investigating
1814	* pcap dumps it's easy to miss warning ARP requests being
1815	* focused on investigation of other protocols flow.
1816	*/
1817	#ifdef DEBUG_vvl
1818	Assert((dst != INADDR_ANY));
1819	NOREF(fWarned);
1820	#else
1821	if ( dst == INADDR_ANY
1822	&& !fWarned)
1823	{
1824	LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1825	fWarned = true;
1826	}
1827	#endif /* !DEBUG_vvl */
1828
1829	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1830	if (m == NULL)
1831	{
1832	Log(("NAT: Can't alloc mbuf for ARP request\n"));
1833	LogFlowFuncLeave();
1834	return;
1835	}
1836	ehdr = mtod(m, struct ethhdr *);
1837	memset(ehdr->h_source, 0xff, ETH_ALEN);
1838	ahdr = (struct arphdr *)&ehdr[1];
1839	ahdr->ar_hrd = RT_H2N_U16_C(1);
1840	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1841	ahdr->ar_hln = ETH_ALEN;
1842	ahdr->ar_pln = 4;
1843	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1844	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1845	/* we assume that this request come from gw, but not from DNS or TFTP */
1846	ahdr->ar_sha[5] = CTL_ALIAS;
1847	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1848	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1849	(uint32_t )ahdr->ar_tip = dst;
1850	/* warn!!! should falls in mbuf minimal size */
1851	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1852	m->m_data += ETH_HLEN;
1853	m->m_len -= ETH_HLEN;
1854	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1855	LogFlowFuncLeave();
1856	}
1857	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1858	void slirp_add_host_resolver_mapping(PNATState pData, const char pszHostName, const char pszHostNamePattern, uint32_t u32HostIP)
1859	{
1860	LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1861	pszHostName ? pszHostName : "(null)",
1862	pszHostNamePattern ? pszHostNamePattern : "(null)",
1863	u32HostIP));
1864	if ( ( pszHostName
1865	\|\| pszHostNamePattern)
1866	&& u32HostIP != INADDR_ANY
1867	&& u32HostIP != INADDR_BROADCAST)
1868	{
1869	PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1870	if (!pDnsMapping)
1871	{
1872	LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1873	LogFlowFuncLeave();
1874	return;
1875	}
1876	pDnsMapping->u32IpAddress = u32HostIP;
1877	if (pszHostName)
1878	pDnsMapping->pszCName = RTStrDup(pszHostName);
1879	else if (pszHostNamePattern)
1880	pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1881	if ( !pDnsMapping->pszCName
1882	&& !pDnsMapping->pszPattern)
1883	{
1884	LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1885	RTMemFree(pDnsMapping);
1886	LogFlowFuncLeave();
1887	return;
1888	}
1889	LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1890	LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
1891	pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1892	pDnsMapping->u32IpAddress));
1893	}
1894	LogFlowFuncLeave();
1895	}
1896	#endif
1897
1898	/* updates the arp cache
1899	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1900	* @returns 0 - if has found and updated
1901	* 1 - if hasn't found.
1902	*/
1903	static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1904	{
1905	struct arp_cache_entry *ac;
1906	Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1907	&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1908	LIST_FOREACH(ac, &pData->arp_cache, list)
1909	{
1910	if (!memcmp(ac->ether, mac, ETH_ALEN))
1911	{
1912	ac->ip = dst;
1913	return 0;
1914	}
1915	}
1916	return 1;
1917	}
1918
1919	/**
1920	* add entry to the arp cache
1921	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1922	*/
1923	static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1924	{
1925	struct arp_cache_entry *ac = NULL;
1926	Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
1927	&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
1928	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1929	if (ac == NULL)
1930	{
1931	Log(("NAT: Can't allocate arp cache entry\n"));
1932	return;
1933	}
1934	ac->ip = ip;
1935	memcpy(ac->ether, ether, ETH_ALEN);
1936	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
1937	}
1938
1939	/* updates or adds entry to the arp cache
1940	* @returns 0 - if has found and updated
1941	* 1 - if hasn't found.
1942	*/
1943	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1944	{
1945	if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1946	\|\| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
1947	{
1948	static bool fBroadcastEtherAddReported;
1949	if (!fBroadcastEtherAddReported)
1950	{
1951	LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
1952	mac, dst));
1953	fBroadcastEtherAddReported = true;
1954	}
1955	return 1;
1956	}
1957	if (slirp_arp_cache_update(pData, dst, mac))
1958	slirp_arp_cache_add(pData, dst, mac);
1959
1960	return 0;
1961	}
1962
1963
1964	void slirp_set_mtu(PNATState pData, int mtu)
1965	{
1966	if (mtu < 20 \|\| mtu >= 16000)
1967	{
1968	LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
1969	mtu = 1500;
1970	}
1971	/* MTU is maximum transition unit on */
1972	if_mtu =
1973	if_mru = mtu;
1974	}
1975
1976	/**
1977	* Info handler.
1978	*/
1979	void slirp_info(PNATState pData, PCDBGFINFOHLP pHlp, const char *pszArgs)
1980	{
1981	struct socket so, so_next;
1982	struct arp_cache_entry *ac;
1983	struct port_forward_rule *rule;
1984	NOREF(pszArgs);
1985
1986	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
1987	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
1988	QSOCKET_FOREACH(so, so_next, tcp)
1989	/* { */
1990	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1991	}
1992
1993	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
1994	QSOCKET_FOREACH(so, so_next, udp)
1995	/* { */
1996	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1997	}
1998
1999	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
2000	LIST_FOREACH(ac, &pData->arp_cache, list)
2001	{
2002	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
2003	}
2004
2005	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2006	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2007	{
2008	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2009	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2010	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2011	rule->activated ? ' ' : '*');
2012	}
2013	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 43575

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