slirp.c@ 50690

Last change on this file since 50690 was 50690, checked in by vboxsync, 11 years ago
NAT:slirp.c::slirp_init instead rising link_up flag do call slirp_link_up on ending state of initialization.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 65.9 KB

Line
1	/* $Id: slirp.c 50690 2014-03-05 06:47:13Z 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	SOWRITE(ret, pData, so);
863	/*
864	* XXX If we wrote something (a lot), there could be the need
865	* for a window update. In the worst case, the remote will send
866	* a window probe to get things going again.
867	*/
868	LogFlowFunc(("LEAVE: true\n"));
869	return true;
870	}
871
872	#if defined(RT_OS_WINDOWS)
873	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
874	#else /* RT_OS_WINDOWS */
875	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
876	#endif /* !RT_OS_WINDOWS */
877	{
878	struct socket so, so_next;
879	int ret;
880	#if defined(RT_OS_WINDOWS)
881	WSANETWORKEVENTS NetworkEvents;
882	int rc;
883	int error;
884	#endif
885
886	STAM_PROFILE_START(&pData->StatPoll, a);
887
888	/* Update time */
889	updtime(pData);
890
891	/*
892	* See if anything has timed out
893	*/
894	if (link_up)
895	{
896	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
897	{
898	STAM_PROFILE_START(&pData->StatFastTimer, b);
899	tcp_fasttimo(pData);
900	time_fasttimo = 0;
901	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
902	}
903	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
904	{
905	STAM_PROFILE_START(&pData->StatSlowTimer, c);
906	ip_slowtimo(pData);
907	tcp_slowtimo(pData);
908	last_slowtimo = curtime;
909	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
910	}
911	}
912	#if defined(RT_OS_WINDOWS)
913	if (fTimeout)
914	return; /* only timer update */
915	#endif
916
917	/*
918	* Check sockets
919	*/
920	if (!link_up)
921	goto done;
922	#if defined(RT_OS_WINDOWS)
923	/*XXX: before renaming please make see define
924	* fIcmp in slirp_state.h
925	*/
926	if (fIcmp)
927	sorecvfrom(pData, &pData->icmp_socket);
928	#else
929	if ( (pData->icmp_socket.s != -1)
930	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
931	sorecvfrom(pData, &pData->icmp_socket);
932	#endif
933	/*
934	* Check TCP sockets
935	*/
936	QSOCKET_FOREACH(so, so_next, tcp)
937	/* { */
938	/* TCP socket can't be cloned */
939	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
940	Assert((!so->so_cloneOf));
941	#endif
942	Assert(!so->fUnderPolling);
943	so->fUnderPolling = 1;
944	if (slirpVerifyAndFreeSocket(pData, so))
945	CONTINUE(tcp);
946	/*
947	* FD_ISSET is meaningless on these sockets
948	* (and they can crash the program)
949	*/
950	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
951	{
952	so->fUnderPolling = 0;
953	CONTINUE(tcp);
954	}
955
956	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
957
958	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
959
960
961	/*
962	* Check for URG data
963	* This will soread as well, so no need to
964	* test for readfds below if this succeeds
965	*/
966
967	/* out-of-band data */
968	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
969	#ifdef RT_OS_DARWIN
970	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
971	* combination on other Unixs hosts doesn't enter to this branch
972	*/
973	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
974	#endif
975	#ifdef RT_OS_WINDOWS
976	/**
977	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
978	*/
979	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
980	#endif
981	)
982	{
983	sorecvoob(pData, so);
984	if (slirpVerifyAndFreeSocket(pData, so))
985	CONTINUE(tcp);
986	}
987
988	/*
989	* Check sockets for reading
990	*/
991	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
992	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
993	{
994
995	#ifdef RT_OS_WINDOWS
996	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
997	{
998	/* Finish connection first */
999	/* should we ignore return value? */
1000	bool fRet = slirpConnectOrWrite(pData, so, true);
1001	LogFunc(("fRet:%RTbool\n", fRet));
1002	if (slirpVerifyAndFreeSocket(pData, so))
1003	CONTINUE(tcp);
1004	}
1005	#endif
1006	/*
1007	* Check for incoming connections
1008	*/
1009	if (so->so_state & SS_FACCEPTCONN)
1010	{
1011	TCP_CONNECT(pData, so);
1012	if (slirpVerifyAndFreeSocket(pData, so))
1013	CONTINUE(tcp);
1014	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
1015	{
1016	so->fUnderPolling = 0;
1017	CONTINUE(tcp);
1018	}
1019	}
1020
1021	ret = soread(pData, so);
1022	if (slirpVerifyAndFreeSocket(pData, so))
1023	CONTINUE(tcp);
1024	/* Output it if we read something */
1025	if (RT_LIKELY(ret > 0))
1026	TCP_OUTPUT(pData, sototcpcb(so));
1027
1028	if (slirpVerifyAndFreeSocket(pData, so))
1029	CONTINUE(tcp);
1030	}
1031
1032	/*
1033	* Check for FD_CLOSE events.
1034	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1035	*/
1036	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1037	\|\| (so->so_close == 1))
1038	{
1039	/*
1040	* drain the socket
1041	*/
1042	for (; so_next->so_prev == so
1043	&& !slirpVerifyAndFreeSocket(pData, so);)
1044	{
1045	ret = soread(pData, so);
1046	if (slirpVerifyAndFreeSocket(pData, so))
1047	break;
1048
1049	if (ret > 0)
1050	TCP_OUTPUT(pData, sototcpcb(so));
1051	else if (so_next->so_prev == so)
1052	{
1053	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1054	break;
1055	}
1056	}
1057
1058	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1059	if (so_next->so_prev == so)
1060	{
1061	/* mark the socket for termination _after_ it was drained */
1062	so->so_close = 1;
1063	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1064	* Actually in the specific error scenario, POLLERR is set as well. */
1065	#ifndef RT_OS_WINDOWS
1066	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1067	sofcantsendmore(so);
1068	#endif
1069	}
1070	if (so_next->so_prev == so)
1071	so->fUnderPolling = 0;
1072	CONTINUE(tcp);
1073	}
1074
1075	/*
1076	* Check sockets for writing
1077	*/
1078	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1079	#ifdef RT_OS_WINDOWS
1080	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1081	#endif
1082	)
1083	{
1084	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1085	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1086	* so we should be ready to such situations.
1087	*/
1088	if (slirpVerifyAndFreeSocket(pData, so))
1089	CONTINUE(tcp);
1090	else if (!fConnectOrWriteSuccess)
1091	{
1092	so->fUnderPolling = 0;
1093	CONTINUE(tcp);
1094	}
1095	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1096	}
1097
1098	/*
1099	* Probe a still-connecting, non-blocking socket
1100	* to check if it's still alive
1101	*/
1102	#ifdef PROBE_CONN
1103	if (so->so_state & SS_ISFCONNECTING)
1104	{
1105	ret = recv(so->s, (char *)&ret, 0, 0);
1106
1107	if (ret < 0)
1108	{
1109	/* XXX */
1110	if ( soIgnorableErrorCode(errno)
1111	\|\| errno == ENOTCONN)
1112	{
1113	CONTINUE(tcp); /* Still connecting, continue */
1114	}
1115
1116	/* else failed */
1117	so->so_state = SS_NOFDREF;
1118
1119	/* tcp_input will take care of it */
1120	}
1121	else
1122	{
1123	ret = send(so->s, &ret, 0, 0);
1124	if (ret < 0)
1125	{
1126	/* XXX */
1127	if ( soIgnorableErrorCode(errno)
1128	\|\| errno == ENOTCONN)
1129	{
1130	CONTINUE(tcp);
1131	}
1132	/* else failed */
1133	so->so_state = SS_NOFDREF;
1134	}
1135	else
1136	so->so_state &= ~SS_ISFCONNECTING;
1137
1138	}
1139	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1140	} /* SS_ISFCONNECTING */
1141	#endif
1142	if (!slirpVerifyAndFreeSocket(pData, so))
1143	so->fUnderPolling = 0;
1144	LOOP_LABEL(tcp, so, so_next);
1145	}
1146
1147	/*
1148	* Now UDP sockets.
1149	* Incoming packets are sent straight away, they're not buffered.
1150	* Incoming UDP data isn't buffered either.
1151	*/
1152	QSOCKET_FOREACH(so, so_next, udp)
1153	/* { */
1154	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1155	if (so->so_cloneOf)
1156	CONTINUE_NO_UNLOCK(udp);
1157	#endif
1158	#if 0
1159	so->fUnderPolling = 1;
1160	if(slirpVerifyAndFreeSocket(pData, so));
1161	CONTINUE(udp);
1162	so->fUnderPolling = 0;
1163	#endif
1164
1165	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1166
1167	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1168
1169	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1170	{
1171	SORECVFROM(pData, so);
1172	}
1173	LOOP_LABEL(udp, so, so_next);
1174	}
1175
1176	done:
1177
1178	STAM_PROFILE_STOP(&pData->StatPoll, a);
1179	}
1180
1181
1182	struct arphdr
1183	{
1184	unsigned short ar_hrd; /* format of hardware address */
1185	unsigned short ar_pro; /* format of protocol address */
1186	unsigned char ar_hln; /* length of hardware address */
1187	unsigned char ar_pln; /* length of protocol address */
1188	unsigned short ar_op; /* ARP opcode (command) */
1189
1190	/*
1191	* Ethernet looks like this : This bit is variable sized however...
1192	*/
1193	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1194	unsigned char ar_sip[4]; /* sender IP address */
1195	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1196	unsigned char ar_tip[4]; /* target IP address */
1197	};
1198	AssertCompileSize(struct arphdr, 28);
1199
1200	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1201	{
1202	struct ethhdr *pEtherHeaderResponse;
1203	struct arphdr *pARPHeaderResponse;
1204	uint32_t ip4TargetAddressInHostFormat;
1205	struct mbuf *pMbufResponse;
1206
1207	Assert((pcu8EtherSource));
1208	if (!pcu8EtherSource)
1209	return;
1210	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1211
1212	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1213	if (!pMbufResponse)
1214	return;
1215	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1216	/* @note: if_encap will swap src and dst*/
1217	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1218	pMbufResponse->m_data += ETH_HLEN;
1219	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1220	pMbufResponse->m_len = sizeof(struct arphdr);
1221
1222	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1223	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1224	pARPHeaderResponse->ar_hln = ETH_ALEN;
1225	pARPHeaderResponse->ar_pln = 4;
1226	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1227	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1228
1229	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1230	{
1231	static bool fTagErrorReported;
1232	if (!fTagErrorReported)
1233	{
1234	LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
1235	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1236	fTagErrorReported = true;
1237	}
1238	}
1239	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1240
1241	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1242	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1243	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1244	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1245	}
1246	/**
1247	* @note This function will free m!
1248	*/
1249	static void arp_input(PNATState pData, struct mbuf *m)
1250	{
1251	struct ethhdr *pEtherHeader;
1252	struct arphdr *pARPHeader;
1253	uint32_t ip4TargetAddress;
1254
1255	int ar_op;
1256	pEtherHeader = mtod(m, struct ethhdr *);
1257	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1258
1259	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1260	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1261
1262	switch (ar_op)
1263	{
1264	case ARPOP_REQUEST:
1265	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1266	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1267	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1268	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1269
1270	/* Gratuitous ARP */
1271	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1272	&& memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1273	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1274	{
1275	/* We've received an announce about address assignment,
1276	* let's do an ARP cache update
1277	*/
1278	static bool fGratuitousArpReported;
1279	if (!fGratuitousArpReported)
1280	{
1281	LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
1282	pARPHeader->ar_sip, pARPHeader->ar_sha));
1283	fGratuitousArpReported = true;
1284	}
1285	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1286	}
1287	break;
1288
1289	case ARPOP_REPLY:
1290	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1291	break;
1292
1293	default:
1294	break;
1295	}
1296
1297	m_freem(pData, m);
1298	}
1299
1300	/**
1301	* Feed a packet into the slirp engine.
1302	*
1303	* @param m Data buffer, m_len is not valid.
1304	* @param cbBuf The length of the data in m.
1305	*/
1306	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1307	{
1308	int proto;
1309	static bool fWarnedIpv6;
1310	struct ethhdr *eh;
1311	uint8_t au8Ether[ETH_ALEN];
1312
1313	m->m_len = cbBuf;
1314	if (cbBuf < ETH_HLEN)
1315	{
1316	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1317	m_freem(pData, m);
1318	return;
1319	}
1320	eh = mtod(m, struct ethhdr *);
1321	proto = RT_N2H_U16(eh->h_proto);
1322
1323	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1324
1325	switch(proto)
1326	{
1327	case ETH_P_ARP:
1328	arp_input(pData, m);
1329	break;
1330
1331	case ETH_P_IP:
1332	/* Update time. Important if the network is very quiet, as otherwise
1333	* the first outgoing connection gets an incorrect timestamp. */
1334	updtime(pData);
1335	m_adj(m, ETH_HLEN);
1336	M_ASSERTPKTHDR(m);
1337	m->m_pkthdr.header = mtod(m, void *);
1338	ip_input(pData, m);
1339	break;
1340
1341	case ETH_P_IPV6:
1342	m_freem(pData, m);
1343	if (!fWarnedIpv6)
1344	{
1345	LogRel(("NAT: IPv6 not supported\n"));
1346	fWarnedIpv6 = true;
1347	}
1348	break;
1349
1350	default:
1351	Log(("NAT: Unsupported protocol %x\n", proto));
1352	m_freem(pData, m);
1353	break;
1354	}
1355
1356	if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1357	activate_port_forwarding(pData, au8Ether);
1358	}
1359
1360	/**
1361	* Output the IP packet to the ethernet device.
1362	*
1363	* @note This function will free m!
1364	*/
1365	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1366	{
1367	struct ethhdr *eh;
1368	uint8_t *mbuf = NULL;
1369	size_t mlen = 0;
1370	STAM_PROFILE_START(&pData->StatIF_encap, a);
1371	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1372	pData, eth_proto, m, flags));
1373
1374	M_ASSERTPKTHDR(m);
1375	m->m_data -= ETH_HLEN;
1376	m->m_len += ETH_HLEN;
1377	eh = mtod(m, struct ethhdr *);
1378	mlen = m->m_len;
1379
1380	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1381	{
1382	struct m_tag *t = m_tag_first(m);
1383	uint8_t u8ServiceId = CTL_ALIAS;
1384	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1385	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1386	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1387	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1388	{
1389	/* don't do anything */
1390	m_freem(pData, m);
1391	goto done;
1392	}
1393	if ( t
1394	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1395	{
1396	Assert(t);
1397	u8ServiceId = (uint8_t )&t[1];
1398	}
1399	eh->h_source[5] = u8ServiceId;
1400	}
1401	/*
1402	* we're processing the chain, that isn't not expected.
1403	*/
1404	Assert((!m->m_next));
1405	if (m->m_next)
1406	{
1407	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1408	m_freem(pData, m);
1409	goto done;
1410	}
1411	mbuf = mtod(m, uint8_t *);
1412	eh->h_proto = RT_H2N_U16(eth_proto);
1413	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1414	if (flags & ETH_ENCAP_URG)
1415	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1416	else
1417	slirp_output(pData->pvUser, m, mbuf, mlen);
1418	done:
1419	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1420	LogFlowFuncLeave();
1421	}
1422
1423	/**
1424	* Still we're using dhcp server leasing to map ether to IP
1425	* @todo see rt_lookup_in_cache
1426	*/
1427	static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1428	{
1429	uint32_t ip = INADDR_ANY;
1430	int rc;
1431
1432	if (eth_addr == NULL)
1433	return INADDR_ANY;
1434
1435	if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1436	\|\| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1437	return INADDR_ANY;
1438
1439	rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1440	if (RT_SUCCESS(rc))
1441	return ip;
1442
1443	bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1444	/* ignore return code, ip will be set to INADDR_ANY on error */
1445	return ip;
1446	}
1447
1448	/**
1449	* We need check if we've activated port forwarding
1450	* for specific machine ... that of course relates to
1451	* service mode
1452	* @todo finish this for service case
1453	*/
1454	static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1455	{
1456	struct port_forward_rule rule, tmp;
1457	const uint8_t *pu8EthSource = h_source;
1458
1459	/* check mac here */
1460	LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1461	{
1462	struct socket *so;
1463	struct alias_link *alias_link;
1464	struct libalias *lib;
1465	int flags;
1466	struct sockaddr sa;
1467	struct sockaddr_in *psin;
1468	socklen_t socketlen;
1469	struct in_addr alias;
1470	int rc;
1471	uint32_t guest_addr; /* need to understand if we already give address to guest */
1472
1473	if (rule->activated)
1474	continue;
1475
1476	#ifdef VBOX_WITH_NAT_SERVICE
1477	/**
1478	* case when guest ip is INADDR_ANY shouldn't appear in NAT service
1479	*/
1480	Assert((rule->guest_addr.s_addr != INADDR_ANY));
1481	guest_addr = rule->guest_addr.s_addr;
1482	#else /* VBOX_WITH_NAT_SERVICE */
1483	guest_addr = find_guest_ip(pData, pu8EthSource);
1484	#endif /* !VBOX_WITH_NAT_SERVICE */
1485	if (guest_addr == INADDR_ANY)
1486	{
1487	/* the address wasn't granted */
1488	return;
1489	}
1490
1491	#if !defined(VBOX_WITH_NAT_SERVICE)
1492	if ( rule->guest_addr.s_addr != guest_addr
1493	&& rule->guest_addr.s_addr != INADDR_ANY)
1494	continue;
1495	if (rule->guest_addr.s_addr == INADDR_ANY)
1496	rule->guest_addr.s_addr = guest_addr;
1497	#endif
1498
1499	LogRel(("NAT: set redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1500	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1501
1502	if (rule->proto == IPPROTO_UDP)
1503	so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1504	RT_H2N_U16(rule->guest_port), 0);
1505	else
1506	so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1507	RT_H2N_U16(rule->guest_port), 0);
1508
1509	if (so == NULL)
1510	goto remove_port_forwarding;
1511
1512	psin = (struct sockaddr_in *)&sa;
1513	psin->sin_family = AF_INET;
1514	psin->sin_port = 0;
1515	psin->sin_addr.s_addr = INADDR_ANY;
1516	socketlen = sizeof(struct sockaddr);
1517
1518	rc = getsockname(so->s, &sa, &socketlen);
1519	if (rc < 0 \|\| sa.sa_family != AF_INET)
1520	goto remove_port_forwarding;
1521
1522	psin = (struct sockaddr_in *)&sa;
1523
1524	lib = LibAliasInit(pData, NULL);
1525	flags = LibAliasSetMode(lib, 0, 0);
1526	flags \|= pData->i32AliasMode;
1527	flags \|= PKT_ALIAS_REVERSE; /* set reverse */
1528	flags = LibAliasSetMode(lib, flags, ~0);
1529
1530	alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) \| CTL_ALIAS);
1531	alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
1532	alias, RT_H2N_U16(rule->guest_port),
1533	pData->special_addr, -1, /* not very clear for now */
1534	rule->proto);
1535	if (!alias_link)
1536	goto remove_port_forwarding;
1537
1538	so->so_la = lib;
1539	rule->activated = 1;
1540	rule->so = so;
1541	pData->cRedirectionsActive++;
1542	continue;
1543
1544	remove_port_forwarding:
1545	LogRel(("NAT: failed to redirect %s %d => %d\n",
1546	(rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
1547	LIST_REMOVE(rule, list);
1548	pData->cRedirectionsStored--;
1549	RTMemFree(rule);
1550	}
1551	}
1552
1553	/**
1554	* Changes in 3.1 instead of opening new socket do the following:
1555	* gain more information:
1556	* 1. bind IP
1557	* 2. host port
1558	* 3. guest port
1559	* 4. proto
1560	* 5. guest MAC address
1561	* the guest's MAC address is rather important for service, but we easily
1562	* could get it from VM configuration in DrvNAT or Service, the idea is activating
1563	* corresponding port-forwarding
1564	*/
1565	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1566	struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1567	{
1568	struct port_forward_rule *rule = NULL;
1569	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1570	{
1571	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1572	&& rule->host_port == host_port
1573	&& rule->bind_ip.s_addr == host_addr.s_addr
1574	&& rule->guest_port == guest_port
1575	&& rule->guest_addr.s_addr == guest_addr.s_addr
1576	)
1577	return 0; /* rule has been already registered */
1578	}
1579
1580	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1581	if (rule == NULL)
1582	return 1;
1583
1584	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1585	rule->host_port = host_port;
1586	rule->guest_port = guest_port;
1587	rule->guest_addr.s_addr = guest_addr.s_addr;
1588	rule->bind_ip.s_addr = host_addr.s_addr;
1589	if (ethaddr != NULL)
1590	memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1591	/* @todo add mac address */
1592	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1593	pData->cRedirectionsStored++;
1594	/* activate port-forwarding if guest has already got assigned IP */
1595	if ( ethaddr
1596	&& memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
1597	activate_port_forwarding(pData, ethaddr);
1598	return 0;
1599	}
1600
1601	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1602	struct in_addr guest_addr, int guest_port)
1603	{
1604	struct port_forward_rule *rule = NULL;
1605	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1606	{
1607	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1608	&& rule->host_port == host_port
1609	&& rule->guest_port == guest_port
1610	&& rule->bind_ip.s_addr == host_addr.s_addr
1611	&& rule->guest_addr.s_addr == guest_addr.s_addr
1612	&& rule->activated)
1613	{
1614	LogRel(("NAT: remove redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1615	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1616
1617	LibAliasUninit(rule->so->so_la);
1618	if (is_udp)
1619	udp_detach(pData, rule->so);
1620	else
1621	tcp_close(pData, sototcpcb(rule->so));
1622	LIST_REMOVE(rule, list);
1623	RTMemFree(rule);
1624	pData->cRedirectionsStored--;
1625	break;
1626	}
1627
1628	}
1629	return 0;
1630	}
1631
1632	void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1633	{
1634	#ifndef VBOX_WITH_NAT_SERVICE
1635	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1636	#endif
1637	if (GuestIP != INADDR_ANY)
1638	{
1639	slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1640	activate_port_forwarding(pData, ethaddr);
1641	}
1642	}
1643
1644	#if defined(RT_OS_WINDOWS)
1645	HANDLE *slirp_get_events(PNATState pData)
1646	{
1647	return pData->phEvents;
1648	}
1649	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1650	{
1651	pData->phEvents[index] = hEvent;
1652	}
1653	#endif
1654
1655	unsigned int slirp_get_timeout_ms(PNATState pData)
1656	{
1657	if (link_up)
1658	{
1659	if (time_fasttimo)
1660	return 2;
1661	if (do_slowtimo)
1662	return 500; /* see PR_SLOWHZ */
1663	}
1664	return 36001000; / one hour */
1665	}
1666
1667	#ifndef RT_OS_WINDOWS
1668	int slirp_get_nsock(PNATState pData)
1669	{
1670	return pData->nsock;
1671	}
1672	#endif
1673
1674	/*
1675	* this function called from NAT thread
1676	*/
1677	void slirp_post_sent(PNATState pData, void *pvArg)
1678	{
1679	struct mbuf m = (struct mbuf )pvArg;
1680	m_freem(pData, m);
1681	}
1682
1683	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1684	{
1685	Log2(("tftp_prefix: %s\n", tftpPrefix));
1686	tftp_prefix = tftpPrefix;
1687	}
1688
1689	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1690	{
1691	Log2(("bootFile: %s\n", bootFile));
1692	bootp_filename = bootFile;
1693	}
1694
1695	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1696	{
1697	Log2(("next_server: %s\n", next_server));
1698	if (next_server == NULL)
1699	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1700	else
1701	inet_aton(next_server, &pData->tftp_server);
1702	}
1703
1704	int slirp_set_binding_address(PNATState pData, char *addr)
1705	{
1706	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1707	{
1708	pData->bindIP.s_addr = INADDR_ANY;
1709	return 1;
1710	}
1711	return 0;
1712	}
1713
1714	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1715	{
1716	if (!pData->fUseHostResolver)
1717	{
1718	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1719	pData->fUseDnsProxy = fDNSProxy;
1720	}
1721	else if (fDNSProxy)
1722	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1723	}
1724
1725	#define CHECK_ARG(name, val, lim_min, lim_max) \
1726	do { \
1727	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1728	{ \
1729	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1730	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1731	return; \
1732	} \
1733	else \
1734	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1735	} while (0)
1736
1737	void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1738	{
1739	LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
1740	/* Conditions */
1741	if (iSoMaxConn > SOMAXCONN)
1742	{
1743	LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1744	iSoMaxConn = SOMAXCONN;
1745	}
1746
1747	if (iSoMaxConn < 1)
1748	{
1749	LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1750	LogFlowFuncLeave();
1751	return;
1752	}
1753
1754	/* Asignment */
1755	if (pData->soMaxConn != iSoMaxConn)
1756	{
1757	LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1758	pData->soMaxConn, iSoMaxConn));
1759	pData->soMaxConn = iSoMaxConn;
1760	}
1761	LogFlowFuncLeave();
1762	}
1763	/* don't allow user set less 8kB and more than 1M values */
1764	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1765	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1766	{
1767	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1768	pData->socket_rcv = kilobytes;
1769	}
1770	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1771	{
1772	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1773	pData->socket_snd = kilobytes * _1K;
1774	}
1775	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1776	{
1777	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1778	tcp_rcvspace = kilobytes * _1K;
1779	}
1780	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1781	{
1782	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1783	tcp_sndspace = kilobytes * _1K;
1784	}
1785
1786	/*
1787	* Looking for Ether by ip in ARP-cache
1788	* Note: it´s responsible of caller to allocate buffer for result
1789	* @returns iprt status code
1790	*/
1791	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1792	{
1793	struct arp_cache_entry *ac;
1794
1795	if (ether == NULL)
1796	return VERR_INVALID_PARAMETER;
1797
1798	if (LIST_EMPTY(&pData->arp_cache))
1799	return VERR_NOT_FOUND;
1800
1801	LIST_FOREACH(ac, &pData->arp_cache, list)
1802	{
1803	if ( ac->ip == ip
1804	&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1805	{
1806	memcpy(ether, ac->ether, ETH_ALEN);
1807	return VINF_SUCCESS;
1808	}
1809	}
1810	return VERR_NOT_FOUND;
1811	}
1812
1813	/*
1814	* Looking for IP by Ether in ARP-cache
1815	* Note: it´s responsible of caller to allocate buffer for result
1816	* @returns 0 - if found, 1 - otherwise
1817	*/
1818	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1819	{
1820	struct arp_cache_entry *ac;
1821	*ip = INADDR_ANY;
1822
1823	if (LIST_EMPTY(&pData->arp_cache))
1824	return VERR_NOT_FOUND;
1825
1826	LIST_FOREACH(ac, &pData->arp_cache, list)
1827	{
1828	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1829	{
1830	*ip = ac->ip;
1831	return VINF_SUCCESS;
1832	}
1833	}
1834	return VERR_NOT_FOUND;
1835	}
1836
1837	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1838	{
1839	struct mbuf *m;
1840	struct ethhdr *ehdr;
1841	struct arphdr *ahdr;
1842	static bool fWarned = false;
1843	LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1844
1845	/* ARP request WHO HAS 0.0.0.0 is one of the signals
1846	* that something has been broken at Slirp. Investigating
1847	* pcap dumps it's easy to miss warning ARP requests being
1848	* focused on investigation of other protocols flow.
1849	*/
1850	#ifdef DEBUG_vvl
1851	Assert((dst != INADDR_ANY));
1852	NOREF(fWarned);
1853	#else
1854	if ( dst == INADDR_ANY
1855	&& !fWarned)
1856	{
1857	LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1858	fWarned = true;
1859	}
1860	#endif /* !DEBUG_vvl */
1861
1862	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1863	if (m == NULL)
1864	{
1865	Log(("NAT: Can't alloc mbuf for ARP request\n"));
1866	LogFlowFuncLeave();
1867	return;
1868	}
1869	ehdr = mtod(m, struct ethhdr *);
1870	memset(ehdr->h_source, 0xff, ETH_ALEN);
1871	ahdr = (struct arphdr *)&ehdr[1];
1872	ahdr->ar_hrd = RT_H2N_U16_C(1);
1873	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1874	ahdr->ar_hln = ETH_ALEN;
1875	ahdr->ar_pln = 4;
1876	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1877	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1878	/* we assume that this request come from gw, but not from DNS or TFTP */
1879	ahdr->ar_sha[5] = CTL_ALIAS;
1880	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1881	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1882	(uint32_t )ahdr->ar_tip = dst;
1883	/* warn!!! should falls in mbuf minimal size */
1884	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1885	m->m_data += ETH_HLEN;
1886	m->m_len -= ETH_HLEN;
1887	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1888	LogFlowFuncLeave();
1889	}
1890	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1891	void slirp_add_host_resolver_mapping(PNATState pData, const char pszHostName, const char pszHostNamePattern, uint32_t u32HostIP)
1892	{
1893	LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1894	pszHostName ? pszHostName : "(null)",
1895	pszHostNamePattern ? pszHostNamePattern : "(null)",
1896	u32HostIP));
1897	if ( ( pszHostName
1898	\|\| pszHostNamePattern)
1899	&& u32HostIP != INADDR_ANY
1900	&& u32HostIP != INADDR_BROADCAST)
1901	{
1902	PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1903	if (!pDnsMapping)
1904	{
1905	LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1906	LogFlowFuncLeave();
1907	return;
1908	}
1909	pDnsMapping->u32IpAddress = u32HostIP;
1910	if (pszHostName)
1911	pDnsMapping->pszCName = RTStrDup(pszHostName);
1912	else if (pszHostNamePattern)
1913	pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1914	if ( !pDnsMapping->pszCName
1915	&& !pDnsMapping->pszPattern)
1916	{
1917	LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1918	RTMemFree(pDnsMapping);
1919	LogFlowFuncLeave();
1920	return;
1921	}
1922	LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1923	LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
1924	pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1925	pDnsMapping->u32IpAddress));
1926	}
1927	LogFlowFuncLeave();
1928	}
1929	#endif
1930
1931	/* updates the arp cache
1932	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1933	* @returns 0 - if has found and updated
1934	* 1 - if hasn't found.
1935	*/
1936	static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1937	{
1938	struct arp_cache_entry *ac;
1939	Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1940	&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1941	LIST_FOREACH(ac, &pData->arp_cache, list)
1942	{
1943	if (!memcmp(ac->ether, mac, ETH_ALEN))
1944	{
1945	ac->ip = dst;
1946	return 0;
1947	}
1948	}
1949	return 1;
1950	}
1951
1952	/**
1953	* add entry to the arp cache
1954	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1955	*/
1956	static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1957	{
1958	struct arp_cache_entry *ac = NULL;
1959	Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
1960	&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
1961	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1962	if (ac == NULL)
1963	{
1964	Log(("NAT: Can't allocate arp cache entry\n"));
1965	return;
1966	}
1967	ac->ip = ip;
1968	memcpy(ac->ether, ether, ETH_ALEN);
1969	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
1970	}
1971
1972	/* updates or adds entry to the arp cache
1973	* @returns 0 - if has found and updated
1974	* 1 - if hasn't found.
1975	*/
1976	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1977	{
1978	if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1979	\|\| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
1980	{
1981	static bool fBroadcastEtherAddReported;
1982	if (!fBroadcastEtherAddReported)
1983	{
1984	LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
1985	mac, dst));
1986	fBroadcastEtherAddReported = true;
1987	}
1988	return 1;
1989	}
1990	if (slirp_arp_cache_update(pData, dst, mac))
1991	slirp_arp_cache_add(pData, dst, mac);
1992
1993	return 0;
1994	}
1995
1996
1997	void slirp_set_mtu(PNATState pData, int mtu)
1998	{
1999	if (mtu < 20 \|\| mtu >= 16000)
2000	{
2001	LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
2002	mtu = 1500;
2003	}
2004	/* MTU is maximum transition unit on */
2005	if_mtu =
2006	if_mru = mtu;
2007	}
2008
2009	/**
2010	* Info handler.
2011	*/
2012	void slirp_info(PNATState pData, const void pvArg, const char pszArgs)
2013	{
2014	struct socket so, so_next;
2015	struct arp_cache_entry *ac;
2016	struct port_forward_rule *rule;
2017	PCDBGFINFOHLP pHlp = (PCDBGFINFOHLP)pvArg;
2018	NOREF(pszArgs);
2019
2020	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
2021	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
2022	QSOCKET_FOREACH(so, so_next, tcp)
2023	/* { */
2024	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2025	}
2026
2027	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
2028	QSOCKET_FOREACH(so, so_next, udp)
2029	/* { */
2030	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2031	}
2032
2033	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
2034	LIST_FOREACH(ac, &pData->arp_cache, list)
2035	{
2036	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
2037	}
2038
2039	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2040	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2041	{
2042	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2043	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2044	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2045	rule->activated ? ' ' : '*');
2046	}
2047	}
2048
2049	/**
2050	* @note: NATState::fUseHostResolver could be changed in bootp.c::dhcp_decode
2051	* @note: this function is executed on GUI/VirtualBox or main/VBoxHeadless thread.
2052	* @note: this function can potentially race with bootp.c::dhcp_decode (except Darwin)
2053	*/
2054	int slirp_host_network_configuration_change_strategy_selector(const PNATState pData)
2055	{
2056	if (pData->fUseHostResolverPermanent) return VBOX_NAT_HNCE_HOSTRESOLVER;
2057	if (pData->fUseDnsProxy) {
2058	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE
2059	/* We dont conflict with bootp.c::dhcp_decode */
2060	struct rcp_state rcp_state;
2061	int rc;
2062
2063	rcp_state.rcps_flags \|= RCPSF_IGNORE_IPV6;
2064	rc = rcp_parse(&rcp_state, RESOLV_CONF_FILE);
2065	LogRelFunc(("NAT: rcp_parse:%Rrc old domain:%s new domain:%s\n",
2066	rc, LIST_FIRST(&pData->pDomainList)->dd_pszDomain,
2067	rcp_state.rcps_domain));
2068	if ( RT_FAILURE(rc)
2069	\|\| LIST_EMPTY(&pData->pDomainList))
2070	return VBOX_NAT_HNCE_DNSPROXY;
2071
2072	if ( rcp_state.rcps_domain
2073	&& strcmp(rcp_state.rcps_domain, LIST_FIRST(&pData->pDomainList)->dd_pszDomain) == 0)
2074	return VBOX_NAT_HNCE_DNSPROXY;
2075	else
2076	return VBOX_NAT_HNCE_EXSPOSED_NAME_RESOLUTION_INFO; /* XXX: rename it */
2077	#else
2078	/* copy domain name */
2079	/* domain only compare with coy version */
2080	return VBOX_NAT_HNCE_DNSPROXY;
2081	#endif
2082	}
2083	return VBOX_NAT_HNCE_EXSPOSED_NAME_RESOLUTION_INFO;
2084	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 50690

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