slirp.c@ 76747

Last change on this file since 76747 was 76553, checked in by vboxsync, 6 years ago
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1	/* $Id: slirp.c 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* NAT - slirp glue.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 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 <iprt/win/iphlpapi.h>
62	#endif
63	#include <alias.h>
64
65	#ifndef RT_OS_WINDOWS
66	/**
67	* XXX: It shouldn't be non-Windows specific.
68	* resolv_conf_parser.h client's structure isn't OS specific, it's just need to be generalized a
69	* a bit to replace slirp_state.h DNS server (domain) lists with rcp_state like structure.
70	*/
71	# include "resolv_conf_parser.h"
72	#endif
73
74	#ifndef RT_OS_WINDOWS
75	# define DO_ENGAGE_EVENT1(so, fdset, label) \
76	do { \
77	if ( so->so_poll_index != -1 \
78	&& so->s == polls[so->so_poll_index].fd) \
79	{ \
80	polls[so->so_poll_index].events \|= N_(fdset ## _poll); \
81	break; \
82	} \
83	AssertRelease(poll_index < (nfds)); \
84	AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
85	polls[poll_index].fd = (so)->s; \
86	(so)->so_poll_index = poll_index; \
87	polls[poll_index].events = N_(fdset ## _poll); \
88	polls[poll_index].revents = 0; \
89	poll_index++; \
90	} while (0)
91
92	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
93	do { \
94	if ( so->so_poll_index != -1 \
95	&& so->s == polls[so->so_poll_index].fd) \
96	{ \
97	polls[so->so_poll_index].events \|= \
98	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
99	break; \
100	} \
101	AssertRelease(poll_index < (nfds)); \
102	polls[poll_index].fd = (so)->s; \
103	(so)->so_poll_index = poll_index; \
104	polls[poll_index].events = \
105	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
106	poll_index++; \
107	} while (0)
108
109	# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
110
111	/*
112	* DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
113	* gcc warns about attempts to log POLLNVAL so construction in a last to lines
114	* used to catch POLLNVAL while logging and return false in case of error while
115	* normal usage.
116	*/
117	# define DO_CHECK_FD_SET(so, events, fdset) \
118	( ((so)->so_poll_index != -1) \
119	&& ((so)->so_poll_index <= ndfs) \
120	&& ((so)->s == polls[so->so_poll_index].fd) \
121	&& (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
122	&& ( N_(fdset ## _poll) == POLLNVAL \
123	\|\| !(polls[(so)->so_poll_index].revents & POLLNVAL)))
124
125	/* specific for Windows Winsock API */
126	# define DO_WIN_CHECK_FD_SET(so, events, fdset) 0
127
128	# ifndef RT_OS_LINUX
129	# define readfds_poll (POLLRDNORM)
130	# define writefds_poll (POLLWRNORM)
131	# else
132	# define readfds_poll (POLLIN)
133	# define writefds_poll (POLLOUT)
134	# endif
135	# define xfds_poll (POLLPRI)
136	# define closefds_poll (POLLHUP)
137	# define rderr_poll (POLLERR)
138	# if 0 /* unused yet */
139	# define rdhup_poll (POLLHUP)
140	# define nval_poll (POLLNVAL)
141	# endif
142
143	# define ICMP_ENGAGE_EVENT(so, fdset) \
144	do { \
145	if (pData->icmp_socket.s != -1) \
146	DO_ENGAGE_EVENT1((so), fdset, ICMP); \
147	} while (0)
148
149	#else /* RT_OS_WINDOWS */
150
151	/*
152	* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
153	* So no call to WSAEventSelect necessary.
154	*/
155	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while (0)
156
157	/*
158	* On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
159	*/
160	# define DO_ENGAGE_EVENT1(so, fdset1, label) \
161	do { \
162	rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
163	if (rc == SOCKET_ERROR) \
164	{ \
165	/* This should not happen */ \
166	error = WSAGetLastError(); \
167	LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
168	error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
169	} \
170	} while (0); \
171	CONTINUE(label)
172
173	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
174	DO_ENGAGE_EVENT1((so), (fdset1), label)
175
176	# define DO_POLL_EVENTS(rc, error, so, events, label) \
177	(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
178	if ((rc) == SOCKET_ERROR) \
179	{ \
180	(error) = WSAGetLastError(); \
181	LogRel(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
182	LogFunc(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
183	CONTINUE(label); \
184	}
185
186	# define acceptds_win FD_ACCEPT
187	# define acceptds_win_bit FD_ACCEPT_BIT
188	# define readfds_win FD_READ
189	# define readfds_win_bit FD_READ_BIT
190	# define writefds_win FD_WRITE
191	# define writefds_win_bit FD_WRITE_BIT
192	# define xfds_win FD_OOB
193	# define xfds_win_bit FD_OOB_BIT
194	# define closefds_win FD_CLOSE
195	# define closefds_win_bit FD_CLOSE_BIT
196	# define connectfds_win FD_CONNECT
197	# define connectfds_win_bit FD_CONNECT_BIT
198
199	# define closefds_win FD_CLOSE
200	# define closefds_win_bit FD_CLOSE_BIT
201
202	# define DO_CHECK_FD_SET(so, events, fdset) \
203	((events).lNetworkEvents & fdset ## _win)
204
205	# define DO_WIN_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
206	# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /specific for Unix API /
207
208	#endif /* RT_OS_WINDOWS */
209
210	#define TCP_ENGAGE_EVENT1(so, fdset) \
211	DO_ENGAGE_EVENT1((so), fdset, tcp)
212
213	#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
214	DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
215
216	#ifdef RT_OS_WINDOWS
217	# define WIN_TCP_ENGAGE_EVENT2(so, fdset, fdset2) TCP_ENGAGE_EVENT2(so, fdset1, fdset2)
218	#endif
219
220	#define UDP_ENGAGE_EVENT(so, fdset) \
221	DO_ENGAGE_EVENT1((so), fdset, udp)
222
223	#define POLL_TCP_EVENTS(rc, error, so, events) \
224	DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
225
226	#define POLL_UDP_EVENTS(rc, error, so, events) \
227	DO_POLL_EVENTS((rc), (error), (so), (events), udp)
228
229	#define CHECK_FD_SET(so, events, set) \
230	(DO_CHECK_FD_SET((so), (events), set))
231
232	#define WIN_CHECK_FD_SET(so, events, set) \
233	(DO_WIN_CHECK_FD_SET((so), (events), set))
234
235	/*
236	* Loging macros
237	*/
238	#ifdef VBOX_WITH_DEBUG_NAT_SOCKETS
239	# if defined(RT_OS_WINDOWS)
240	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
241	do { \
242	LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
243	} while (0)
244	# else /* !RT_OS_WINDOWS */
245	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
246	do { \
247	LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
248	CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
249	CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
250	CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
251	CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
252	CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
253	CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
254	} while (0)
255	# endif /* !RT_OS_WINDOWS */
256	#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
257	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
258	#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
259
260	#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
261	DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
262
263	static const uint8_t special_ethaddr[6] =
264	{
265	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
266	};
267
268	static const uint8_t broadcast_ethaddr[6] =
269	{
270	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
271	};
272
273	const uint8_t zerro_ethaddr[6] =
274	{
275	0x0, 0x0, 0x0, 0x0, 0x0, 0x0
276	};
277
278	/**
279	* This helper routine do the checks in descriptions to
280	* ''fUnderPolling'' and ''fShouldBeRemoved'' flags
281	* @returns 1 if socket removed and 0 if no changes was made.
282	*/
283	static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
284	{
285	AssertPtrReturn(pData, 0);
286	AssertPtrReturn(pSocket, 0);
287	AssertReturn(pSocket->fUnderPolling, 0);
288	if (pSocket->fShouldBeRemoved)
289	{
290	pSocket->fUnderPolling = 0;
291	sofree(pData, pSocket);
292	/* pSocket is PHANTOM, now */
293	return 1;
294	}
295	return 0;
296	}
297
298	int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
299	bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
300	int iIcmpCacheLimit, void *pvUser)
301	{
302	int rc;
303	PNATState pData;
304	if (u32Netmask & 0x1f)
305	{
306	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
307	LogRel(("NAT: The last 5 bits of the netmask (%RTnaipv4) need to be unset\n", RT_BE2H_U32(u32Netmask)));
308	return VERR_INVALID_PARAMETER;
309	}
310	pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
311	*ppData = pData;
312	if (!pData)
313	return VERR_NO_MEMORY;
314	pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
315	pData->fUseHostResolver = fUseHostResolver;
316	pData->fUseHostResolverPermanent = fUseHostResolver;
317	pData->pvUser = pvUser;
318	pData->netmask = u32Netmask;
319
320	rc = RTCritSectRwInit(&pData->CsRwHandlerChain);
321	if (RT_FAILURE(rc))
322	return rc;
323
324	/* sockets & TCP defaults */
325	pData->socket_rcv = 64 * _1K;
326	pData->socket_snd = 64 * _1K;
327	tcp_sndspace = 64 * _1K;
328	tcp_rcvspace = 64 * _1K;
329
330	/*
331	* Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
332	* to avoid release log noise.
333	*/
334	pData->soMaxConn = 10;
335
336	#ifdef RT_OS_WINDOWS
337	{
338	WSADATA Data;
339	RTLDRMOD hLdrMod;
340
341	WSAStartup(MAKEWORD(2, 0), &Data);
342
343	rc = RTLdrLoadSystem("Iphlpapi.dll", true /fNoUnload/, &hLdrMod);
344	if (RT_SUCCESS(rc))
345	{
346	rc = RTLdrGetSymbol(hLdrMod, "GetAdaptersAddresses", (void **)&pData->pfnGetAdaptersAddresses);
347	if (RT_FAILURE(rc))
348	LogRel(("NAT: Can't find GetAdapterAddresses in Iphlpapi.dll\n"));
349
350	RTLdrClose(hLdrMod);
351	}
352	}
353	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
354	#endif
355
356	rc = bootp_dhcp_init(pData);
357	if (RT_FAILURE(rc))
358	{
359	Log(("NAT: DHCP server initialization failed\n"));
360	RTMemFree(pData);
361	*ppData = NULL;
362	return rc;
363	}
364	debug_init(pData);
365	if_init(pData);
366	ip_init(pData);
367	icmp_init(pData, iIcmpCacheLimit);
368
369	/* Initialise mbufs after setting the MTU */
370	mbuf_init(pData);
371
372	pData->special_addr.s_addr = u32NetAddr;
373	pData->slirp_ethaddr = &special_ethaddr[0];
374	alias_addr.s_addr = pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_ALIAS);
375	/** @todo add ability to configure this staff */
376
377	/*
378	* Some guests won't reacquire DHCP lease on link flap when VM is
379	* restored. Instead of forcing users to explicitly set CTL_GUEST
380	* in port-forwarding rules, provide it as initial guess here.
381	*/
382	slirp_update_guest_addr_guess(pData,
383	pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_GUEST),
384	"initialization");
385
386	/* set default addresses */
387	inet_aton("127.0.0.1", &loopback_addr);
388
389	rc = slirpTftpInit(pData);
390	AssertRCReturn(rc, VINF_NAT_DNS);
391
392	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
393	{
394	LogRel(("NAT: bad alias mode 0x%x ignored\n", i32AliasMode));
395	i32AliasMode = 0;
396	}
397	else if (i32AliasMode != 0)
398	{
399	LogRel(("NAT: alias mode 0x%x\n", i32AliasMode));
400	}
401
402	pData->i32AliasMode = i32AliasMode;
403	getouraddr(pData);
404	{
405	int flags = 0;
406	struct in_addr proxy_addr;
407	pData->proxy_alias = LibAliasInit(pData, NULL);
408	if (pData->proxy_alias == NULL)
409	{
410	Log(("NAT: LibAlias default rule wasn't initialized\n"));
411	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
412	}
413	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
414	#ifndef NO_FW_PUNCH
415	flags \|= PKT_ALIAS_PUNCH_FW;
416	#endif
417	flags \|= pData->i32AliasMode; /* do transparent proxying */
418	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0U);
419	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
420	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
421	ftp_alias_load(pData);
422	nbt_alias_load(pData);
423	}
424	#ifdef VBOX_WITH_NAT_SEND2HOME
425	/** @todo we should know all interfaces available on host. */
426	pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
427	pData->cInHomeAddressSize = 1;
428	inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
429	pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
430	# ifdef RT_OS_DARWIN
431	pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
432	# endif
433	#endif
434
435	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
436	STAILQ_INIT(&pData->DNSMapNames);
437	STAILQ_INIT(&pData->DNSMapPatterns);
438	#endif
439
440	slirp_link_up(pData);
441	return VINF_SUCCESS;
442	}
443
444	/**
445	* Register statistics.
446	*/
447	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
448	{
449	#ifdef VBOX_WITH_STATISTICS
450	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
451	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
452	# include "counters.h"
453	# undef COUNTER
454	/** @todo register statistics for the variables dumped by:
455	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
456	* mbufstats(pData); sockstats(pData); */
457	#else /* VBOX_WITH_STATISTICS */
458	NOREF(pData);
459	NOREF(pDrvIns);
460	#endif /* !VBOX_WITH_STATISTICS */
461	}
462
463	/**
464	* Deregister statistics.
465	*/
466	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
467	{
468	if (pData == NULL)
469	return;
470	#ifdef VBOX_WITH_STATISTICS
471	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
472	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
473	# include "counters.h"
474	#else /* VBOX_WITH_STATISTICS */
475	NOREF(pData);
476	NOREF(pDrvIns);
477	#endif /* !VBOX_WITH_STATISTICS */
478	}
479
480	/**
481	* Marks the link as up, making it possible to establish new connections.
482	*/
483	void slirp_link_up(PNATState pData)
484	{
485	if (link_up == 1)
486	return;
487
488	link_up = 1;
489
490	if (!pData->fUseHostResolverPermanent)
491	slirpInitializeDnsSettings(pData);
492	}
493
494	/**
495	* Marks the link as down and cleans up the current connections.
496	*/
497	void slirp_link_down(PNATState pData)
498	{
499	if (link_up == 0)
500	return;
501
502	slirpReleaseDnsSettings(pData);
503
504	link_up = 0;
505	}
506
507	/**
508	* Terminates the slirp component.
509	*/
510	void slirp_term(PNATState pData)
511	{
512	struct socket *so;
513
514	if (pData == NULL)
515	return;
516
517	icmp_finit(pData);
518
519	while ((so = tcb.so_next) != &tcb)
520	{
521	/* Don't miss TCB releasing */
522	if ( !sototcpcb(so)
523	&& ( so->so_state & SS_NOFDREF
524	\|\| so->s == -1))
525	sofree(pData, so);
526	else
527	tcp_close(pData, sototcpcb(so));
528	}
529
530	while ((so = udb.so_next) != &udb)
531	udp_detach(pData, so);
532
533	slirp_link_down(pData);
534	ftp_alias_unload(pData);
535	nbt_alias_unload(pData);
536
537	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
538	{
539	DNSMAPPINGHEAD *heads[2];
540	int i;
541
542	heads[0] = &pData->DNSMapNames;
543	heads[1] = &pData->DNSMapPatterns;
544	for (i = 0; i < RT_ELEMENTS(heads); ++i)
545	{
546	while (!STAILQ_EMPTY(heads[i]))
547	{
548	PDNSMAPPINGENTRY pDnsEntry = STAILQ_FIRST(heads[i]);
549	STAILQ_REMOVE_HEAD(heads[i], MapList);
550	RTStrFree(pDnsEntry->pszName);
551	RTMemFree(pDnsEntry);
552	}
553	}
554	}
555	#endif
556
557	while (!LIST_EMPTY(&instancehead))
558	{
559	struct libalias *la = LIST_FIRST(&instancehead);
560	/* libalias do all clean up */
561	LibAliasUninit(la);
562	}
563	while (!LIST_EMPTY(&pData->arp_cache))
564	{
565	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
566	LIST_REMOVE(ac, list);
567	RTMemFree(ac);
568	}
569	while (!LIST_EMPTY(&pData->port_forward_rule_head))
570	{
571	struct port_forward_rule *rule = LIST_FIRST(&pData->port_forward_rule_head);
572	LIST_REMOVE(rule, list);
573	RTMemFree(rule);
574	}
575	slirpTftpTerm(pData);
576	bootp_dhcp_fini(pData);
577	m_fini(pData);
578	#ifdef RT_OS_WINDOWS
579	WSACleanup();
580	#endif
581	#ifdef LOG_ENABLED
582	Log(("\n"
583	"NAT statistics\n"
584	"--------------\n"
585	"\n"));
586	ipstats(pData);
587	tcpstats(pData);
588	udpstats(pData);
589	icmpstats(pData);
590	mbufstats(pData);
591	sockstats(pData);
592	Log(("\n"
593	"\n"
594	"\n"));
595	#endif
596	RTCritSectRwDelete(&pData->CsRwHandlerChain);
597	RTMemFree(pData);
598	}
599
600
601	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
602	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
603
604	/*
605	* curtime kept to an accuracy of 1ms
606	*/
607	static void updtime(PNATState pData)
608	{
609	#ifdef RT_OS_WINDOWS
610	struct _timeb tb;
611
612	_ftime(&tb);
613	curtime = (u_int)tb.time * (u_int)1000;
614	curtime += (u_int)tb.millitm;
615	#else
616	gettimeofday(&tt, 0);
617
618	curtime = (u_int)tt.tv_sec * (u_int)1000;
619	curtime += (u_int)tt.tv_usec / (u_int)1000;
620
621	if ((tt.tv_usec % 1000) >= 500)
622	curtime++;
623	#endif
624	}
625
626	#ifdef RT_OS_WINDOWS
627	void slirp_select_fill(PNATState pData, int *pnfds)
628	#else /* RT_OS_WINDOWS */
629	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
630	#endif /* !RT_OS_WINDOWS */
631	{
632	struct socket so, so_next;
633	int nfds;
634	#if defined(RT_OS_WINDOWS)
635	int rc;
636	int error;
637	#else
638	int poll_index = 0;
639	#endif
640	int i;
641
642	STAM_PROFILE_START(&pData->StatFill, a);
643
644	nfds = *pnfds;
645
646	/*
647	* First, TCP sockets
648	*/
649	do_slowtimo = 0;
650	if (!link_up)
651	goto done;
652
653	/*
654	* *_slowtimo needs calling if there are IP fragments
655	* in the fragment queue, or there are TCP connections active
656	*/
657	/* XXX:
658	* triggering of fragment expiration should be the same but use new macroses
659	*/
660	do_slowtimo = (tcb.so_next != &tcb);
661	if (!do_slowtimo)
662	{
663	for (i = 0; i < IPREASS_NHASH; i++)
664	{
665	if (!TAILQ_EMPTY(&ipq[i]))
666	{
667	do_slowtimo = 1;
668	break;
669	}
670	}
671	}
672	/* always add the ICMP socket */
673	#ifndef RT_OS_WINDOWS
674	pData->icmp_socket.so_poll_index = -1;
675	#endif
676	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
677
678	STAM_COUNTER_RESET(&pData->StatTCP);
679	STAM_COUNTER_RESET(&pData->StatTCPHot);
680
681	QSOCKET_FOREACH(so, so_next, tcp)
682	/* { */
683	Assert(so->so_type == IPPROTO_TCP);
684	#if !defined(RT_OS_WINDOWS)
685	so->so_poll_index = -1;
686	#endif
687	STAM_COUNTER_INC(&pData->StatTCP);
688
689	/*
690	* See if we need a tcp_fasttimo
691	*/
692	if ( time_fasttimo == 0
693	&& so->so_tcpcb != NULL
694	&& so->so_tcpcb->t_flags & TF_DELACK)
695	{
696	time_fasttimo = curtime; /* Flag when we want a fasttimo */
697	}
698
699	/*
700	* NOFDREF can include still connecting to local-host,
701	* newly socreated() sockets etc. Don't want to select these.
702	*/
703	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
704	CONTINUE(tcp);
705
706	/*
707	* Set for reading sockets which are accepting
708	*/
709	if (so->so_state & SS_FACCEPTCONN)
710	{
711	STAM_COUNTER_INC(&pData->StatTCPHot);
712	TCP_ENGAGE_EVENT1(so, readfds);
713	CONTINUE(tcp);
714	}
715
716	/*
717	* Set for writing sockets which are connecting
718	*/
719	if (so->so_state & SS_ISFCONNECTING)
720	{
721	Log2(("connecting %R[natsock] engaged\n",so));
722	STAM_COUNTER_INC(&pData->StatTCPHot);
723	#ifdef RT_OS_WINDOWS
724	WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
725	#else
726	TCP_ENGAGE_EVENT1(so, writefds);
727	#endif
728	}
729
730	/*
731	* Set for writing if we are connected, can send more, and
732	* we have something to send
733	*/
734	if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
735	{
736	STAM_COUNTER_INC(&pData->StatTCPHot);
737	TCP_ENGAGE_EVENT1(so, writefds);
738	}
739
740	/*
741	* Set for reading (and urgent data) if we are connected, can
742	* receive more, and we have room for it XXX /2 ?
743	*/
744	/** @todo vvl - check which predicat here will be more useful here in rerm of new sbufs. */
745	if ( CONN_CANFRCV(so)
746	&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
747	#ifdef RT_OS_WINDOWS
748	&& !(so->so_state & SS_ISFCONNECTING)
749	#endif
750	)
751	{
752	STAM_COUNTER_INC(&pData->StatTCPHot);
753	TCP_ENGAGE_EVENT2(so, readfds, xfds);
754	}
755	LOOP_LABEL(tcp, so, so_next);
756	}
757
758	/*
759	* UDP sockets
760	*/
761	STAM_COUNTER_RESET(&pData->StatUDP);
762	STAM_COUNTER_RESET(&pData->StatUDPHot);
763
764	QSOCKET_FOREACH(so, so_next, udp)
765	/* { */
766
767	Assert(so->so_type == IPPROTO_UDP);
768	STAM_COUNTER_INC(&pData->StatUDP);
769	#if !defined(RT_OS_WINDOWS)
770	so->so_poll_index = -1;
771	#endif
772
773	/*
774	* See if it's timed out
775	*/
776	if (so->so_expire)
777	{
778	if (so->so_expire <= curtime)
779	{
780	Log2(("NAT: %R[natsock] expired\n", so));
781	if (so->so_timeout != NULL)
782	{
783	/* so_timeout - might change the so_expire value or
784	* drop so_timeout* from so.
785	*/
786	so->so_timeout(pData, so, so->so_timeout_arg);
787	/* on 4.2 so->
788	*/
789	if ( so_next->so_prev != so /* so_timeout freed the socket */
790	\|\| so->so_timeout) /* so_timeout just freed so_timeout */
791	CONTINUE_NO_UNLOCK(udp);
792	}
793	UDP_DETACH(pData, so, so_next);
794	CONTINUE_NO_UNLOCK(udp);
795	}
796	}
797
798	/*
799	* When UDP packets are received from over the link, they're
800	* sendto()'d straight away, so no need for setting for writing
801	* Limit the number of packets queued by this session to 4.
802	* Note that even though we try and limit this to 4 packets,
803	* the session could have more queued if the packets needed
804	* to be fragmented.
805	*
806	* (XXX <= 4 ?)
807	*/
808	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
809	{
810	STAM_COUNTER_INC(&pData->StatUDPHot);
811	UDP_ENGAGE_EVENT(so, readfds);
812	}
813	LOOP_LABEL(udp, so, so_next);
814	}
815	done:
816
817	#if defined(RT_OS_WINDOWS)
818	*pnfds = VBOX_EVENT_COUNT;
819	#else /* RT_OS_WINDOWS */
820	AssertRelease(poll_index <= *pnfds);
821	*pnfds = poll_index;
822	#endif /* !RT_OS_WINDOWS */
823
824	STAM_PROFILE_STOP(&pData->StatFill, a);
825	}
826
827
828	/**
829	* This function do Connection or sending tcp sequence to.
830	* @returns if true operation completed
831	* @note: functions call tcp_input that potentially could lead to tcp_drop
832	*/
833	static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
834	{
835	int ret;
836	LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
837	/*
838	* Check for non-blocking, still-connecting sockets
839	*/
840	if (so->so_state & SS_ISFCONNECTING)
841	{
842	Log2(("connecting %R[natsock] catched\n", so));
843	/* Connected */
844	so->so_state &= ~SS_ISFCONNECTING;
845
846	/*
847	* This should be probably guarded by PROBE_CONN too. Anyway,
848	* we disable it on OS/2 because the below send call returns
849	* EFAULT which causes the opened TCP socket to close right
850	* after it has been opened and connected.
851	*/
852	#ifndef RT_OS_OS2
853	ret = send(so->s, (const char *)&ret, 0, 0);
854	if (ret < 0)
855	{
856	/* XXXXX Must fix, zero bytes is a NOP */
857	if ( soIgnorableErrorCode(errno)
858	\|\| errno == ENOTCONN)
859	{
860	LogFlowFunc(("LEAVE: false\n"));
861	return false;
862	}
863
864	/* else failed */
865	so->so_state = SS_NOFDREF;
866	}
867	/* else so->so_state &= ~SS_ISFCONNECTING; */
868	#endif
869
870	/*
871	* Continue tcp_input
872	*/
873	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
874	/* continue; */
875	}
876	else if (!fConnectOnly)
877	{
878	SOWRITE(ret, pData, so);
879	if (RT_LIKELY(ret > 0))
880	{
881	/*
882	* Make sure we will send window update to peer. This is
883	* a moral equivalent of calling tcp_output() for PRU_RCVD
884	* in tcp_usrreq() of the real stack.
885	*/
886	struct tcpcb *tp = sototcpcb(so);
887	if (RT_LIKELY(tp != NULL))
888	tp->t_flags \|= TF_DELACK;
889	}
890	}
891
892	LogFlowFunc(("LEAVE: true\n"));
893	return true;
894	}
895
896	#if defined(RT_OS_WINDOWS)
897	void slirp_select_poll(PNATState pData, int fTimeout)
898	#else /* RT_OS_WINDOWS */
899	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
900	#endif /* !RT_OS_WINDOWS */
901	{
902	struct socket so, so_next;
903	int ret;
904	#if defined(RT_OS_WINDOWS)
905	WSANETWORKEVENTS NetworkEvents;
906	int rc;
907	int error;
908	#endif
909
910	STAM_PROFILE_START(&pData->StatPoll, a);
911
912	/* Update time */
913	updtime(pData);
914
915	/*
916	* See if anything has timed out
917	*/
918	if (link_up)
919	{
920	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
921	{
922	STAM_PROFILE_START(&pData->StatFastTimer, b);
923	tcp_fasttimo(pData);
924	time_fasttimo = 0;
925	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
926	}
927	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
928	{
929	STAM_PROFILE_START(&pData->StatSlowTimer, c);
930	ip_slowtimo(pData);
931	tcp_slowtimo(pData);
932	last_slowtimo = curtime;
933	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
934	}
935	}
936	#if defined(RT_OS_WINDOWS)
937	if (fTimeout)
938	return; /* only timer update */
939	#endif
940
941	/*
942	* Check sockets
943	*/
944	if (!link_up)
945	goto done;
946	#if defined(RT_OS_WINDOWS)
947	icmpwin_process(pData);
948	#else
949	if ( (pData->icmp_socket.s != -1)
950	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
951	sorecvfrom(pData, &pData->icmp_socket);
952	#endif
953	/*
954	* Check TCP sockets
955	*/
956	QSOCKET_FOREACH(so, so_next, tcp)
957	/* { */
958	Assert(!so->fUnderPolling);
959	so->fUnderPolling = 1;
960	if (slirpVerifyAndFreeSocket(pData, so))
961	CONTINUE(tcp);
962	/*
963	* FD_ISSET is meaningless on these sockets
964	* (and they can crash the program)
965	*/
966	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
967	{
968	so->fUnderPolling = 0;
969	CONTINUE(tcp);
970	}
971
972	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
973
974	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
975
976	if (so->so_state & SS_ISFCONNECTING)
977	{
978	int sockerr = 0;
979	#if !defined(RT_OS_WINDOWS)
980	{
981	int revents = 0;
982
983	/*
984	* Failed connect(2) is reported by poll(2) on
985	* different OSes with different combinations of
986	* POLLERR, POLLHUP, and POLLOUT.
987	*/
988	if ( CHECK_FD_SET(so, NetworkEvents, closefds) /* POLLHUP */
989	\|\| CHECK_FD_SET(so, NetworkEvents, rderr)) /* POLLERR */
990	{
991	revents = POLLHUP; /* squash to single "failed" flag */
992	}
993	#if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_NETBSD)
994	/* Solaris and NetBSD report plain POLLOUT even on error */
995	else if (CHECK_FD_SET(so, NetworkEvents, writefds)) /* POLLOUT */
996	{
997	revents = POLLOUT;
998	}
999	#endif
1000
1001	if (revents != 0)
1002	{
1003	socklen_t optlen = (socklen_t)sizeof(sockerr);
1004	ret = getsockopt(so->s, SOL_SOCKET, SO_ERROR, &sockerr, &optlen);
1005
1006	if ( RT_UNLIKELY(ret < 0)
1007	\|\| ( (revents & POLLHUP)
1008	&& RT_UNLIKELY(sockerr == 0)))
1009	sockerr = ETIMEDOUT;
1010	}
1011	}
1012	#else /* RT_OS_WINDOWS */
1013	{
1014	if (NetworkEvents.lNetworkEvents & FD_CONNECT)
1015	sockerr = NetworkEvents.iErrorCode[FD_CONNECT_BIT];
1016	}
1017	#endif
1018	if (sockerr != 0)
1019	{
1020	tcp_fconnect_failed(pData, so, sockerr);
1021	ret = slirpVerifyAndFreeSocket(pData, so);
1022	Assert(ret == 1); /* freed */
1023	CONTINUE(tcp);
1024	}
1025
1026	/*
1027	* XXX: For now just fall through to the old code to
1028	* handle successful connect(2).
1029	*/
1030	}
1031
1032	/*
1033	* Check for URG data
1034	* This will soread as well, so no need to
1035	* test for readfds below if this succeeds
1036	*/
1037
1038	/* out-of-band data */
1039	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
1040	#ifdef RT_OS_DARWIN
1041	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
1042	* combination on other Unixs hosts doesn't enter to this branch
1043	*/
1044	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
1045	#endif
1046	#ifdef RT_OS_WINDOWS
1047	/**
1048	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
1049	*/
1050	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
1051	#endif
1052	)
1053	{
1054	sorecvoob(pData, so);
1055	if (slirpVerifyAndFreeSocket(pData, so))
1056	CONTINUE(tcp);
1057	}
1058
1059	/*
1060	* Check sockets for reading
1061	*/
1062	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
1063	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
1064	{
1065
1066	#ifdef RT_OS_WINDOWS
1067	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
1068	{
1069	/* Finish connection first */
1070	/* should we ignore return value? */
1071	bool fRet = slirpConnectOrWrite(pData, so, true);
1072	LogFunc(("fRet:%RTbool\n", fRet)); NOREF(fRet);
1073	if (slirpVerifyAndFreeSocket(pData, so))
1074	CONTINUE(tcp);
1075	}
1076	#endif
1077	/*
1078	* Check for incoming connections
1079	*/
1080	if (so->so_state & SS_FACCEPTCONN)
1081	{
1082	TCP_CONNECT(pData, so);
1083	if (slirpVerifyAndFreeSocket(pData, so))
1084	CONTINUE(tcp);
1085	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
1086	{
1087	so->fUnderPolling = 0;
1088	CONTINUE(tcp);
1089	}
1090	}
1091
1092	ret = soread(pData, so);
1093	if (slirpVerifyAndFreeSocket(pData, so))
1094	CONTINUE(tcp);
1095	/* Output it if we read something */
1096	if (RT_LIKELY(ret > 0))
1097	TCP_OUTPUT(pData, sototcpcb(so));
1098
1099	if (slirpVerifyAndFreeSocket(pData, so))
1100	CONTINUE(tcp);
1101	}
1102
1103	/*
1104	* Check for FD_CLOSE events.
1105	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1106	*/
1107	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1108	\|\| (so->so_close == 1))
1109	{
1110	/*
1111	* drain the socket
1112	*/
1113	for (; so_next->so_prev == so
1114	&& !slirpVerifyAndFreeSocket(pData, so);)
1115	{
1116	ret = soread(pData, so);
1117	if (slirpVerifyAndFreeSocket(pData, so))
1118	break;
1119
1120	if (ret > 0)
1121	TCP_OUTPUT(pData, sototcpcb(so));
1122	else if (so_next->so_prev == so)
1123	{
1124	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1125	break;
1126	}
1127	}
1128
1129	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1130	if (so_next->so_prev != so)
1131	{
1132	CONTINUE(tcp);
1133	}
1134	else
1135	{
1136	/* mark the socket for termination _after_ it was drained */
1137	so->so_close = 1;
1138	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1139	* Actually in the specific error scenario, POLLERR is set as well. */
1140	#ifndef RT_OS_WINDOWS
1141	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1142	sofcantsendmore(so);
1143	#endif
1144	}
1145	}
1146
1147	/*
1148	* Check sockets for writing
1149	*/
1150	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1151	#ifdef RT_OS_WINDOWS
1152	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1153	#endif
1154	)
1155	{
1156	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1157	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1158	* so we should be ready to such situations.
1159	*/
1160	if (slirpVerifyAndFreeSocket(pData, so))
1161	CONTINUE(tcp);
1162	else if (!fConnectOrWriteSuccess)
1163	{
1164	so->fUnderPolling = 0;
1165	CONTINUE(tcp);
1166	}
1167	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1168	}
1169
1170	/*
1171	* Probe a still-connecting, non-blocking socket
1172	* to check if it's still alive
1173	*/
1174	#ifdef PROBE_CONN
1175	if (so->so_state & SS_ISFCONNECTING)
1176	{
1177	ret = recv(so->s, (char *)&ret, 0, 0);
1178
1179	if (ret < 0)
1180	{
1181	/* XXX */
1182	if ( soIgnorableErrorCode(errno)
1183	\|\| errno == ENOTCONN)
1184	{
1185	CONTINUE(tcp); /* Still connecting, continue */
1186	}
1187
1188	/* else failed */
1189	so->so_state = SS_NOFDREF;
1190
1191	/* tcp_input will take care of it */
1192	}
1193	else
1194	{
1195	ret = send(so->s, &ret, 0, 0);
1196	if (ret < 0)
1197	{
1198	/* XXX */
1199	if ( soIgnorableErrorCode(errno)
1200	\|\| errno == ENOTCONN)
1201	{
1202	CONTINUE(tcp);
1203	}
1204	/* else failed */
1205	so->so_state = SS_NOFDREF;
1206	}
1207	else
1208	so->so_state &= ~SS_ISFCONNECTING;
1209
1210	}
1211	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1212	} /* SS_ISFCONNECTING */
1213	#endif
1214	if (!slirpVerifyAndFreeSocket(pData, so))
1215	so->fUnderPolling = 0;
1216	LOOP_LABEL(tcp, so, so_next);
1217	}
1218
1219	/*
1220	* Now UDP sockets.
1221	* Incoming packets are sent straight away, they're not buffered.
1222	* Incoming UDP data isn't buffered either.
1223	*/
1224	QSOCKET_FOREACH(so, so_next, udp)
1225	/* { */
1226	#if 0
1227	so->fUnderPolling = 1;
1228	if(slirpVerifyAndFreeSocket(pData, so));
1229	CONTINUE(udp);
1230	so->fUnderPolling = 0;
1231	#endif
1232
1233	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1234
1235	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1236
1237	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1238	{
1239	SORECVFROM(pData, so);
1240	}
1241	LOOP_LABEL(udp, so, so_next);
1242	}
1243
1244	done:
1245
1246	STAM_PROFILE_STOP(&pData->StatPoll, a);
1247	}
1248
1249
1250	struct arphdr
1251	{
1252	unsigned short ar_hrd; /* format of hardware address */
1253	unsigned short ar_pro; /* format of protocol address */
1254	unsigned char ar_hln; /* length of hardware address */
1255	unsigned char ar_pln; /* length of protocol address */
1256	unsigned short ar_op; /* ARP opcode (command) */
1257
1258	/*
1259	* Ethernet looks like this : This bit is variable sized however...
1260	*/
1261	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1262	unsigned char ar_sip[4]; /* sender IP address */
1263	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1264	unsigned char ar_tip[4]; /* target IP address */
1265	};
1266	AssertCompileSize(struct arphdr, 28);
1267
1268	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1269	{
1270	struct ethhdr *pEtherHeaderResponse;
1271	struct arphdr *pARPHeaderResponse;
1272	uint32_t ip4TargetAddressInHostFormat;
1273	struct mbuf *pMbufResponse;
1274
1275	Assert((pcu8EtherSource));
1276	if (!pcu8EtherSource)
1277	return;
1278	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1279
1280	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1281	if (!pMbufResponse)
1282	return;
1283	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1284	/* @note: if_encap will swap src and dst*/
1285	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1286	pMbufResponse->m_data += ETH_HLEN;
1287	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1288	pMbufResponse->m_len = sizeof(struct arphdr);
1289
1290	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1291	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1292	pARPHeaderResponse->ar_hln = ETH_ALEN;
1293	pARPHeaderResponse->ar_pln = 4;
1294	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1295	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1296
1297	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1298	{
1299	static bool fTagErrorReported;
1300	if (!fTagErrorReported)
1301	{
1302	LogRel(("NAT: Couldn't add the tag(PACKET_SERVICE:%d)\n",
1303	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1304	fTagErrorReported = true;
1305	}
1306	}
1307	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1308
1309	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1310	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1311	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1312	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1313	}
1314
1315	/**
1316	* @note This function will free m!
1317	*/
1318	static void arp_input(PNATState pData, struct mbuf *m)
1319	{
1320	struct ethhdr *pEtherHeader;
1321	struct arphdr *pARPHeader;
1322	uint32_t ip4TargetAddress;
1323
1324	int ar_op;
1325	pEtherHeader = mtod(m, struct ethhdr *);
1326	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1327
1328	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1329	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1330
1331	switch (ar_op)
1332	{
1333	case ARPOP_REQUEST:
1334	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1335	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1336	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1337	{
1338	slirp_update_guest_addr_guess(pData, (uint32_t )pARPHeader->ar_sip, "arp request");
1339	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1340	break;
1341	}
1342
1343	/* Gratuitous ARP */
1344	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1345	&& ( memcmp(pARPHeader->ar_tha, zerro_ethaddr, ETH_ALEN) == 0
1346	\|\| memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0)
1347	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1348	{
1349	LogRel2(("NAT: Gratuitous ARP from %RTnaipv4 at %RTmac\n",
1350	(uint32_t )pARPHeader->ar_sip, pARPHeader->ar_sha));
1351	slirp_update_guest_addr_guess(pData, (uint32_t )pARPHeader->ar_sip, "gratuitous arp");
1352	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1353	}
1354	break;
1355
1356	case ARPOP_REPLY:
1357	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1358	break;
1359
1360	default:
1361	break;
1362	}
1363
1364	m_freem(pData, m);
1365	}
1366
1367	/**
1368	* Feed a packet into the slirp engine.
1369	*
1370	* @param m Data buffer, m_len is not valid.
1371	* @param cbBuf The length of the data in m.
1372	*/
1373	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1374	{
1375	int proto;
1376	static bool fWarnedIpv6;
1377	struct ethhdr *eh;
1378
1379	m->m_len = (int)cbBuf; Assert((size_t)m->m_len == cbBuf);
1380	if (cbBuf < ETH_HLEN)
1381	{
1382	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1383	m_freem(pData, m);
1384	return;
1385	}
1386
1387	eh = mtod(m, struct ethhdr *);
1388	proto = RT_N2H_U16(eh->h_proto);
1389	switch(proto)
1390	{
1391	case ETH_P_ARP:
1392	arp_input(pData, m);
1393	break;
1394
1395	case ETH_P_IP:
1396	/* Update time. Important if the network is very quiet, as otherwise
1397	* the first outgoing connection gets an incorrect timestamp. */
1398	updtime(pData);
1399	m_adj(m, ETH_HLEN);
1400	M_ASSERTPKTHDR(m);
1401	m->m_pkthdr.header = mtod(m, void *);
1402	ip_input(pData, m);
1403	break;
1404
1405	case ETH_P_IPV6:
1406	m_freem(pData, m);
1407	if (!fWarnedIpv6)
1408	{
1409	LogRel(("NAT: IPv6 not supported\n"));
1410	fWarnedIpv6 = true;
1411	}
1412	break;
1413
1414	default:
1415	Log(("NAT: Unsupported protocol %x\n", proto));
1416	m_freem(pData, m);
1417	break;
1418	}
1419	}
1420
1421	/**
1422	* Output the IP packet to the ethernet device.
1423	*
1424	* @note This function will free m!
1425	*/
1426	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1427	{
1428	struct ethhdr *eh;
1429	uint8_t *mbuf = NULL;
1430	int mlen;
1431	STAM_PROFILE_START(&pData->StatIF_encap, a);
1432	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1433	pData, eth_proto, m, flags));
1434
1435	M_ASSERTPKTHDR(m);
1436
1437	Assert(M_LEADINGSPACE(m) >= ETH_HLEN);
1438	m->m_data -= ETH_HLEN;
1439	m->m_len += ETH_HLEN;
1440	eh = mtod(m, struct ethhdr *);
1441	mlen = m->m_len;
1442
1443	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1444	{
1445	struct m_tag *t = m_tag_first(m);
1446	uint8_t u8ServiceId = CTL_ALIAS;
1447	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1448	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1449	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1450	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1451	{
1452	/* don't do anything */
1453	m_freem(pData, m);
1454	goto done;
1455	}
1456	if ( t
1457	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1458	{
1459	Assert(t);
1460	u8ServiceId = (uint8_t )&t[1];
1461	}
1462	eh->h_source[5] = u8ServiceId;
1463	}
1464	/*
1465	* we're processing the chain, that isn't not expected.
1466	*/
1467	Assert((!m->m_next));
1468	if (m->m_next)
1469	{
1470	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1471	m_freem(pData, m);
1472	goto done;
1473	}
1474	mbuf = mtod(m, uint8_t *);
1475	eh->h_proto = RT_H2N_U16(eth_proto);
1476	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1477	if (flags & ETH_ENCAP_URG)
1478	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1479	else
1480	slirp_output(pData->pvUser, m, mbuf, mlen);
1481	done:
1482	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1483	LogFlowFuncLeave();
1484	}
1485
1486
1487	void
1488	slirp_update_guest_addr_guess(PNATState pData, uint32_t guess, const char *msg)
1489	{
1490	Assert(msg != NULL);
1491
1492	if (pData->guest_addr_guess.s_addr == guess)
1493	{
1494	LogRel2(("NAT: Guest address guess %RTnaipv4 re-confirmed by %s\n",
1495	pData->guest_addr_guess.s_addr, msg));
1496	return;
1497	}
1498
1499	if (pData->guest_addr_guess.s_addr == INADDR_ANY)
1500	{
1501	pData->guest_addr_guess.s_addr = guess;
1502	LogRel(("NAT: Guest address guess set to %RTnaipv4 by %s\n",
1503	pData->guest_addr_guess.s_addr, msg));
1504	return;
1505	}
1506	else
1507	{
1508	LogRel(("NAT: Guest address guess changed from %RTnaipv4 to %RTnaipv4 by %s\n",
1509	pData->guest_addr_guess.s_addr, guess, msg));
1510	pData->guest_addr_guess.s_addr = guess;
1511	return;
1512	}
1513	}
1514
1515
1516	static struct port_forward_rule *
1517	slirp_find_redirect(PNATState pData,
1518	int is_udp,
1519	struct in_addr host_addr, int host_port,
1520	struct in_addr guest_addr, int guest_port)
1521	{
1522	struct port_forward_rule *rule;
1523	uint16_t proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1524
1525	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1526	{
1527	if ( rule->proto == proto
1528	&& rule->host_port == host_port
1529	&& rule->bind_ip.s_addr == host_addr.s_addr
1530	&& rule->guest_port == guest_port
1531	&& rule->guest_addr.s_addr == guest_addr.s_addr)
1532	{
1533	return rule;
1534	}
1535	}
1536
1537	return NULL;
1538	}
1539
1540
1541	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1542	struct in_addr guest_addr, int guest_port)
1543	{
1544	struct port_forward_rule *rule;
1545
1546	rule = slirp_find_redirect(pData, is_udp, host_addr, host_port, guest_addr, guest_port);
1547	if (rule != NULL) /* rule has been already registered */
1548	{
1549	/* XXX: this shouldn't happen */
1550	return 0;
1551	}
1552
1553	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1554	if (rule == NULL)
1555	return 1;
1556
1557	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1558	rule->bind_ip.s_addr = host_addr.s_addr;
1559	rule->host_port = host_port;
1560	rule->guest_addr.s_addr = guest_addr.s_addr;
1561	rule->guest_port = guest_port;
1562
1563	if (rule->proto == IPPROTO_UDP)
1564	rule->so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port),
1565	rule->guest_addr.s_addr, RT_H2N_U16(rule->guest_port), 0);
1566	else
1567	rule->so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port),
1568	rule->guest_addr.s_addr, RT_H2N_U16(rule->guest_port), 0);
1569
1570	if (rule->so == NULL)
1571	{
1572	LogRel(("NAT: Failed to redirect %s %RTnaipv4:%d -> %RTnaipv4:%d (%s)\n",
1573	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1574	rule->bind_ip.s_addr, rule->host_port,
1575	guest_addr, rule->guest_port, strerror(errno)));
1576	RTMemFree(rule);
1577	return 1;
1578	}
1579
1580	LogRel(("NAT: Set redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1581	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1582	rule->bind_ip.s_addr, rule->host_port,
1583	guest_addr, rule->guest_port));
1584
1585	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1586	return 0;
1587	}
1588
1589
1590	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1591	struct in_addr guest_addr, int guest_port)
1592	{
1593	struct port_forward_rule *rule;
1594
1595	rule = slirp_find_redirect(pData, is_udp, host_addr, host_port, guest_addr, guest_port);
1596	if (rule == NULL)
1597	{
1598	LogRel(("NAT: Unable to find redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1599	is_udp ? "UDP" : "TCP",
1600	host_addr.s_addr, host_port,
1601	guest_addr.s_addr, guest_port));
1602	return 0;
1603	}
1604
1605	LogRel(("NAT: Remove redirect %s %RTnaipv4:%d -> %RTnaipv4:%d\n",
1606	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
1607	rule->bind_ip.s_addr, rule->host_port,
1608	guest_addr.s_addr, rule->guest_port));
1609
1610	if (rule->so != NULL)
1611	{
1612	if (is_udp)
1613	udp_detach(pData, rule->so);
1614	else
1615	tcp_close(pData, sototcpcb(rule->so));
1616	}
1617
1618	LIST_REMOVE(rule, list);
1619	RTMemFree(rule);
1620	return 0;
1621	}
1622
1623
1624	#if defined(RT_OS_WINDOWS)
1625	HANDLE *slirp_get_events(PNATState pData)
1626	{
1627	return pData->phEvents;
1628	}
1629	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1630	{
1631	pData->phEvents[index] = hEvent;
1632	}
1633	#endif
1634
1635	unsigned int slirp_get_timeout_ms(PNATState pData)
1636	{
1637	if (link_up)
1638	{
1639	if (time_fasttimo)
1640	return 2;
1641	if (do_slowtimo)
1642	return 500; /* see PR_SLOWHZ */
1643	}
1644	return 36001000; / one hour */
1645	}
1646
1647	#ifndef RT_OS_WINDOWS
1648	int slirp_get_nsock(PNATState pData)
1649	{
1650	return pData->nsock;
1651	}
1652	#endif
1653
1654	/*
1655	* this function called from NAT thread
1656	*/
1657	void slirp_post_sent(PNATState pData, void *pvArg)
1658	{
1659	struct mbuf m = (struct mbuf )pvArg;
1660	m_freem(pData, m);
1661	}
1662
1663	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1664	{
1665	Log2(("tftp_prefix: %s\n", tftpPrefix));
1666	tftp_prefix = tftpPrefix;
1667	}
1668
1669	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1670	{
1671	Log2(("bootFile: %s\n", bootFile));
1672	bootp_filename = bootFile;
1673	}
1674
1675	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1676	{
1677	Log2(("next_server: %s\n", next_server));
1678	if (next_server == NULL)
1679	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1680	else
1681	inet_aton(next_server, &pData->tftp_server);
1682	}
1683
1684	int slirp_set_binding_address(PNATState pData, char *addr)
1685	{
1686	int ok;
1687
1688	pData->bindIP.s_addr = INADDR_ANY;
1689
1690	if (addr == NULL \|\| *addr == '\0')
1691	return VINF_SUCCESS;
1692
1693	ok = inet_aton(addr, &pData->bindIP);
1694	if (!ok)
1695	{
1696	LogRel(("NAT: Unable to parse binding address: %s\n", addr));
1697	return VERR_INVALID_PARAMETER;
1698	}
1699
1700	if (pData->bindIP.s_addr == INADDR_ANY)
1701	return VINF_SUCCESS;
1702
1703	if ((pData->bindIP.s_addr & RT_N2H_U32_C(0xe0000000)) == RT_N2H_U32_C(0xe0000000))
1704	{
1705	LogRel(("NAT: Ignoring multicast binding address %RTnaipv4\n", pData->bindIP.s_addr));
1706	pData->bindIP.s_addr = INADDR_ANY;
1707	return VERR_INVALID_PARAMETER;
1708	}
1709
1710	LogRel(("NAT: Binding address %RTnaipv4\n", pData->bindIP.s_addr));
1711	return VINF_SUCCESS;
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
1891
1892	/* updates the arp cache
1893	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1894	* @returns 0 - if has found and updated
1895	* 1 - if hasn't found.
1896	*/
1897	static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1898	{
1899	struct arp_cache_entry *ac;
1900	Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1901	&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1902	LIST_FOREACH(ac, &pData->arp_cache, list)
1903	{
1904	if (ac->ip == dst)
1905	{
1906	memcpy(ac->ether, mac, ETH_ALEN);
1907	return 0;
1908	}
1909	}
1910	return 1;
1911	}
1912
1913	/**
1914	* add entry to the arp cache
1915	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1916	*/
1917	static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1918	{
1919	struct arp_cache_entry *ac = NULL;
1920	Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
1921	&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
1922	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1923	if (ac == NULL)
1924	{
1925	Log(("NAT: Can't allocate arp cache entry\n"));
1926	return;
1927	}
1928	ac->ip = ip;
1929	memcpy(ac->ether, ether, ETH_ALEN);
1930	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
1931	}
1932
1933	/* updates or adds entry to the arp cache
1934	* @returns 0 - if has found and updated
1935	* 1 - if hasn't found.
1936	*/
1937	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1938	{
1939	if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1940	\|\| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
1941	{
1942	static bool fBroadcastEtherAddReported;
1943	if (!fBroadcastEtherAddReported)
1944	{
1945	LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
1946	mac, dst));
1947	fBroadcastEtherAddReported = true;
1948	}
1949	return 1;
1950	}
1951	if (slirp_arp_cache_update(pData, dst, mac))
1952	slirp_arp_cache_add(pData, dst, mac);
1953
1954	return 0;
1955	}
1956
1957
1958	void slirp_set_mtu(PNATState pData, int mtu)
1959	{
1960	if (mtu < 20 \|\| mtu >= 16000)
1961	{
1962	LogRel(("NAT: MTU(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
1963	mtu = 1500;
1964	}
1965	/* MTU is maximum transition unit on */
1966	if_mtu =
1967	if_mru = mtu;
1968	}
1969
1970	/**
1971	* Info handler.
1972	*/
1973	void slirp_info(PNATState pData, const void pvArg, const char pszArgs)
1974	{
1975	struct socket so, so_next;
1976	struct arp_cache_entry *ac;
1977	struct port_forward_rule *rule;
1978	PCDBGFINFOHLP pHlp = (PCDBGFINFOHLP)pvArg;
1979	NOREF(pszArgs);
1980
1981	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
1982	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
1983	QSOCKET_FOREACH(so, so_next, tcp)
1984	/* { */
1985	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1986	}
1987
1988	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
1989	QSOCKET_FOREACH(so, so_next, udp)
1990	/* { */
1991	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1992	}
1993
1994	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
1995	LIST_FOREACH(ac, &pData->arp_cache, list)
1996	{
1997	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
1998	}
1999
2000	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2001	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2002	{
2003	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2004	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2005	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2006	rule->activated ? ' ' : '*');
2007	}
2008	}
2009
2010	/**
2011	* @note: NATState::fUseHostResolver could be changed in bootp.c::dhcp_decode
2012	* @note: this function is executed on GUI/VirtualBox or main/VBoxHeadless thread.
2013	* @note: this function can potentially race with bootp.c::dhcp_decode (except Darwin)
2014	*/
2015	int slirp_host_network_configuration_change_strategy_selector(const PNATState pData)
2016	{
2017	if (pData->fUseHostResolverPermanent)
2018	return VBOX_NAT_DNS_HOSTRESOLVER;
2019
2020	if (pData->fUseDnsProxy) {
2021	#if HAVE_NOTIFICATION_FOR_DNS_UPDATE /* XXX */ && !defined(RT_OS_WINDOWS)
2022	/* We dont conflict with bootp.c::dhcp_decode */
2023	struct rcp_state rcp_state;
2024	int rc;
2025
2026	rcp_state.rcps_flags = RCPSF_IGNORE_IPV6;
2027	rc = rcp_parse(&rcp_state, RESOLV_CONF_FILE);
2028	LogRelFunc(("NAT: rcp_parse:%Rrc old domain:%s new domain:%s\n",
2029	rc, LIST_EMPTY(&pData->pDomainList)
2030	? "(null)"
2031	: LIST_FIRST(&pData->pDomainList)->dd_pszDomain,
2032	rcp_state.rcps_domain));
2033	if ( RT_FAILURE(rc)
2034	\|\| LIST_EMPTY(&pData->pDomainList))
2035	return VBOX_NAT_DNS_DNSPROXY;
2036
2037	if ( rcp_state.rcps_domain
2038	&& strcmp(rcp_state.rcps_domain, LIST_FIRST(&pData->pDomainList)->dd_pszDomain) == 0)
2039	return VBOX_NAT_DNS_DNSPROXY;
2040	else
2041	return VBOX_NAT_DNS_EXTERNAL;
2042	#else
2043	/* copy domain name */
2044	/* domain only compare with coy version */
2045	return VBOX_NAT_DNS_DNSPROXY;
2046	#endif
2047	}
2048	return VBOX_NAT_DNS_EXTERNAL;
2049	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 76747

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