slirp.c@ 41987

Last change on this file since 41987 was 41987, checked in by vboxsync, 12 years ago
NAT: hide TFTP internals.
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File size: 63.2 KB

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1	/* $Id: slirp.c 41987 2012-07-02 16:44:45Z vboxsync $ */
2	/** @file
3	* NAT - slirp glue.
4	*/
5
6	/*
7	* Copyright (C) 2006-2011 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.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/pdmdrv.h>
51	#include <iprt/assert.h>
52	#include <iprt/file.h>
53	#ifndef RT_OS_WINDOWS
54	# include <sys/ioctl.h>
55	# include <poll.h>
56	# include <netinet/in.h>
57	#else
58	# include <Winnls.h>
59	# define _WINSOCK2API_
60	# include <IPHlpApi.h>
61	#endif
62	#include <alias.h>
63
64	#ifndef RT_OS_WINDOWS
65
66	# define DO_ENGAGE_EVENT1(so, fdset, label) \
67	do { \
68	if ( so->so_poll_index != -1 \
69	&& so->s == polls[so->so_poll_index].fd) \
70	{ \
71	polls[so->so_poll_index].events \|= N_(fdset ## _poll); \
72	break; \
73	} \
74	AssertRelease(poll_index < (nfds)); \
75	AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
76	polls[poll_index].fd = (so)->s; \
77	(so)->so_poll_index = poll_index; \
78	polls[poll_index].events = N_(fdset ## _poll); \
79	polls[poll_index].revents = 0; \
80	poll_index++; \
81	} while (0)
82
83	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
84	do { \
85	if ( so->so_poll_index != -1 \
86	&& so->s == polls[so->so_poll_index].fd) \
87	{ \
88	polls[so->so_poll_index].events \|= \
89	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
90	break; \
91	} \
92	AssertRelease(poll_index < (nfds)); \
93	polls[poll_index].fd = (so)->s; \
94	(so)->so_poll_index = poll_index; \
95	polls[poll_index].events = \
96	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
97	poll_index++; \
98	} while (0)
99
100	# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
101
102	/*
103	* DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
104	* gcc warns about attempts to log POLLNVAL so construction in a last to lines
105	* used to catch POLLNVAL while logging and return false in case of error while
106	* normal usage.
107	*/
108	# define DO_CHECK_FD_SET(so, events, fdset) \
109	( ((so)->so_poll_index != -1) \
110	&& ((so)->so_poll_index <= ndfs) \
111	&& ((so)->s == polls[so->so_poll_index].fd) \
112	&& (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
113	&& ( N_(fdset ## _poll) == POLLNVAL \
114	\|\| !(polls[(so)->so_poll_index].revents & POLLNVAL)))
115
116	/* specific for Windows Winsock API */
117	# define DO_WIN_CHECK_FD_SET(so, events, fdset) 0
118
119	# ifndef RT_OS_LINUX
120	# define readfds_poll (POLLRDNORM)
121	# define writefds_poll (POLLWRNORM)
122	# else
123	# define readfds_poll (POLLIN)
124	# define writefds_poll (POLLOUT)
125	# endif
126	# define xfds_poll (POLLPRI)
127	# define closefds_poll (POLLHUP)
128	# define rderr_poll (POLLERR)
129	# if 0 /* unused yet */
130	# define rdhup_poll (POLLHUP)
131	# define nval_poll (POLLNVAL)
132	# endif
133
134	# define ICMP_ENGAGE_EVENT(so, fdset) \
135	do { \
136	if (pData->icmp_socket.s != -1) \
137	DO_ENGAGE_EVENT1((so), fdset, ICMP); \
138	} while (0)
139
140	#else /* RT_OS_WINDOWS */
141
142	/*
143	* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
144	* So no call to WSAEventSelect necessary.
145	*/
146	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while (0)
147
148	/*
149	* On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
150	*/
151	# define DO_ENGAGE_EVENT1(so, fdset1, label) \
152	do { \
153	rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
154	if (rc == SOCKET_ERROR) \
155	{ \
156	/* This should not happen */ \
157	error = WSAGetLastError(); \
158	LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
159	error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
160	} \
161	} while (0); \
162	CONTINUE(label)
163
164	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
165	DO_ENGAGE_EVENT1((so), (fdset1), label)
166
167	# define DO_POLL_EVENTS(rc, error, so, events, label) \
168	(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
169	if ((rc) == SOCKET_ERROR) \
170	{ \
171	(error) = WSAGetLastError(); \
172	LogRel(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
173	LogFunc(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
174	CONTINUE(label); \
175	}
176
177	# define acceptds_win FD_ACCEPT
178	# define acceptds_win_bit FD_ACCEPT_BIT
179	# define readfds_win FD_READ
180	# define readfds_win_bit FD_READ_BIT
181	# define writefds_win FD_WRITE
182	# define writefds_win_bit FD_WRITE_BIT
183	# define xfds_win FD_OOB
184	# define xfds_win_bit FD_OOB_BIT
185	# define closefds_win FD_CLOSE
186	# define closefds_win_bit FD_CLOSE_BIT
187	# define connectfds_win FD_CONNECT
188	# define connectfds_win_bit FD_CONNECT_BIT
189
190	# define closefds_win FD_CLOSE
191	# define closefds_win_bit FD_CLOSE_BIT
192
193	# define DO_CHECK_FD_SET(so, events, fdset) \
194	(((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
195
196	# define DO_WIN_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
197	# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /specific for Unix API /
198
199	#endif /* RT_OS_WINDOWS */
200
201	#define TCP_ENGAGE_EVENT1(so, fdset) \
202	DO_ENGAGE_EVENT1((so), fdset, tcp)
203
204	#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
205	DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
206
207	#ifdef RT_OS_WINDOWS
208	# define WIN_TCP_ENGAGE_EVENT2(so, fdset, fdset2) TCP_ENGAGE_EVENT2(so, fdset1, fdset2)
209	#endif
210
211	#define UDP_ENGAGE_EVENT(so, fdset) \
212	DO_ENGAGE_EVENT1((so), fdset, udp)
213
214	#define POLL_TCP_EVENTS(rc, error, so, events) \
215	DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
216
217	#define POLL_UDP_EVENTS(rc, error, so, events) \
218	DO_POLL_EVENTS((rc), (error), (so), (events), udp)
219
220	#define CHECK_FD_SET(so, events, set) \
221	(DO_CHECK_FD_SET((so), (events), set))
222
223	#define WIN_CHECK_FD_SET(so, events, set) \
224	(DO_WIN_CHECK_FD_SET((so), (events), set))
225
226	/*
227	* Loging macros
228	*/
229	#if VBOX_WITH_DEBUG_NAT_SOCKETS
230	# if defined(RT_OS_WINDOWS)
231	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
232	do { \
233	LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
234	} while (0)
235	# else /* !RT_OS_WINDOWS */
236	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
237	do { \
238	LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
239	CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
240	CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
241	CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
242	CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
243	CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
244	CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
245	} while (0)
246	# endif /* !RT_OS_WINDOWS */
247	#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
248	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
249	#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
250
251	#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
252	DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
253
254	static void activate_port_forwarding(PNATState, const uint8_t *pEther);
255
256	static const uint8_t special_ethaddr[6] =
257	{
258	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
259	};
260
261	static const uint8_t broadcast_ethaddr[6] =
262	{
263	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
264	};
265
266	const uint8_t zerro_ethaddr[6] =
267	{
268	0x0, 0x0, 0x0, 0x0, 0x0, 0x0
269	};
270
271	/**
272	* This helper routine do the checks in descriptions to
273	* ''fUnderPolling'' and ''fShouldBeRemoved'' flags
274	* @returns 1 if socket removed and 0 if no changes was made.
275	*/
276	static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
277	{
278	AssertPtrReturn(pData, 0);
279	AssertPtrReturn(pSocket, 0);
280	AssertReturn(pSocket->fUnderPolling, 0);
281	if (pSocket->fShouldBeRemoved)
282	{
283	pSocket->fUnderPolling = 0;
284	sofree(pData, pSocket);
285	/* pSocket is PHANTOM, now */
286	return 1;
287	}
288	return 0;
289	}
290
291	int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
292	bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
293	int iIcmpCacheLimit, void *pvUser)
294	{
295	int rc;
296	PNATState pData;
297	if (u32Netmask & 0x1f)
298	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
299	return VERR_INVALID_PARAMETER;
300	pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
301	*ppData = pData;
302	if (!pData)
303	return VERR_NO_MEMORY;
304	pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
305	pData->fUseHostResolver = fUseHostResolver;
306	pData->pvUser = pvUser;
307	pData->netmask = u32Netmask;
308
309	/* sockets & TCP defaults */
310	pData->socket_rcv = 64 * _1K;
311	pData->socket_snd = 64 * _1K;
312	tcp_sndspace = 64 * _1K;
313	tcp_rcvspace = 64 * _1K;
314
315	/*
316	* Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
317	* to avoid release log noise.
318	*/
319	pData->soMaxConn = 10;
320
321	#ifdef RT_OS_WINDOWS
322	{
323	WSADATA Data;
324	WSAStartup(MAKEWORD(2, 0), &Data);
325	}
326	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
327	#endif
328
329	link_up = 1;
330
331	rc = bootp_dhcp_init(pData);
332	if (RT_FAILURE(rc))
333	{
334	Log(("NAT: DHCP server initialization failed\n"));
335	RTMemFree(pData);
336	*ppData = NULL;
337	return rc;
338	}
339	debug_init(pData);
340	if_init(pData);
341	ip_init(pData);
342	icmp_init(pData, iIcmpCacheLimit);
343
344	/* Initialise mbufs after setting the MTU */
345	mbuf_init(pData);
346
347	pData->special_addr.s_addr = u32NetAddr;
348	pData->slirp_ethaddr = &special_ethaddr[0];
349	alias_addr.s_addr = pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_ALIAS);
350	/* @todo: add ability to configure this staff */
351
352	/* set default addresses */
353	inet_aton("127.0.0.1", &loopback_addr);
354	rc = slirpInitializeDnsSettings(pData);
355	AssertRCReturn(rc, VINF_NAT_DNS);
356	rc = slirpTftpInit(pData);
357	AssertRCReturn(rc, VINF_NAT_DNS);
358
359	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
360	{
361	Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
362	i32AliasMode = 0;
363	}
364	pData->i32AliasMode = i32AliasMode;
365	getouraddr(pData);
366	{
367	int flags = 0;
368	struct in_addr proxy_addr;
369	pData->proxy_alias = LibAliasInit(pData, NULL);
370	if (pData->proxy_alias == NULL)
371	{
372	Log(("NAT: LibAlias default rule wasn't initialized\n"));
373	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
374	}
375	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
376	#ifndef NO_FW_PUNCH
377	flags \|= PKT_ALIAS_PUNCH_FW;
378	#endif
379	flags \|= pData->i32AliasMode; /* do transparent proxying */
380	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
381	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
382	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
383	ftp_alias_load(pData);
384	nbt_alias_load(pData);
385	if (pData->fUseHostResolver)
386	dns_alias_load(pData);
387	}
388	#ifdef VBOX_WITH_NAT_SEND2HOME
389	/* @todo: we should know all interfaces available on host. */
390	pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
391	pData->cInHomeAddressSize = 1;
392	inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
393	pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
394	# ifdef RT_OS_DARWIN
395	pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
396	# endif
397	#endif
398	return VINF_SUCCESS;
399	}
400
401	/**
402	* Register statistics.
403	*/
404	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
405	{
406	#ifdef VBOX_WITH_STATISTICS
407	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
408	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
409	# include "counters.h"
410	# undef COUNTER
411	/** @todo register statistics for the variables dumped by:
412	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
413	* mbufstats(pData); sockstats(pData); */
414	#else /* VBOX_WITH_STATISTICS */
415	NOREF(pData);
416	NOREF(pDrvIns);
417	#endif /* !VBOX_WITH_STATISTICS */
418	}
419
420	/**
421	* Deregister statistics.
422	*/
423	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
424	{
425	if (pData == NULL)
426	return;
427	#ifdef VBOX_WITH_STATISTICS
428	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
429	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
430	# include "counters.h"
431	#else /* VBOX_WITH_STATISTICS */
432	NOREF(pData);
433	NOREF(pDrvIns);
434	#endif /* !VBOX_WITH_STATISTICS */
435	}
436
437	/**
438	* Marks the link as up, making it possible to establish new connections.
439	*/
440	void slirp_link_up(PNATState pData)
441	{
442	struct arp_cache_entry *ac;
443	link_up = 1;
444
445	if (LIST_EMPTY(&pData->arp_cache))
446	return;
447
448	LIST_FOREACH(ac, &pData->arp_cache, list)
449	{
450	activate_port_forwarding(pData, ac->ether);
451	}
452	}
453
454	/**
455	* Marks the link as down and cleans up the current connections.
456	*/
457	void slirp_link_down(PNATState pData)
458	{
459	struct socket *so;
460	struct port_forward_rule *rule;
461
462	while ((so = tcb.so_next) != &tcb)
463	{
464	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
465	sofree(pData, so);
466	else
467	tcp_drop(pData, sototcpcb(so), 0);
468	}
469
470	while ((so = udb.so_next) != &udb)
471	udp_detach(pData, so);
472
473	/*
474	* Clear the active state of port-forwarding rules to force
475	* re-setup on restoration of communications.
476	*/
477	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
478	{
479	rule->activated = 0;
480	}
481	pData->cRedirectionsActive = 0;
482
483	link_up = 0;
484	}
485
486	/**
487	* Terminates the slirp component.
488	*/
489	void slirp_term(PNATState pData)
490	{
491	if (pData == NULL)
492	return;
493	icmp_finit(pData);
494
495	slirp_link_down(pData);
496	slirpReleaseDnsSettings(pData);
497	ftp_alias_unload(pData);
498	nbt_alias_unload(pData);
499	if (pData->fUseHostResolver)
500	{
501	dns_alias_unload(pData);
502	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
503	while (!LIST_EMPTY(&pData->DNSMapHead))
504	{
505	PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
506	LIST_REMOVE(pDnsEntry, MapList);
507	RTStrFree(pDnsEntry->pszCName);
508	RTMemFree(pDnsEntry);
509	}
510	#endif
511	}
512	while (!LIST_EMPTY(&instancehead))
513	{
514	struct libalias *la = LIST_FIRST(&instancehead);
515	/* libalias do all clean up */
516	LibAliasUninit(la);
517	}
518	while (!LIST_EMPTY(&pData->arp_cache))
519	{
520	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
521	LIST_REMOVE(ac, list);
522	RTMemFree(ac);
523	}
524	bootp_dhcp_fini(pData);
525	m_fini(pData);
526	#ifdef RT_OS_WINDOWS
527	WSACleanup();
528	#endif
529	#ifndef VBOX_WITH_SLIRP_BSD_SBUF
530	#ifdef LOG_ENABLED
531	Log(("\n"
532	"NAT statistics\n"
533	"--------------\n"
534	"\n"));
535	ipstats(pData);
536	tcpstats(pData);
537	udpstats(pData);
538	icmpstats(pData);
539	mbufstats(pData);
540	sockstats(pData);
541	Log(("\n"
542	"\n"
543	"\n"));
544	#endif
545	#endif
546	RTMemFree(pData);
547	}
548
549
550	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
551	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
552
553	/*
554	* curtime kept to an accuracy of 1ms
555	*/
556	static void updtime(PNATState pData)
557	{
558	#ifdef RT_OS_WINDOWS
559	struct _timeb tb;
560
561	_ftime(&tb);
562	curtime = (u_int)tb.time * (u_int)1000;
563	curtime += (u_int)tb.millitm;
564	#else
565	gettimeofday(&tt, 0);
566
567	curtime = (u_int)tt.tv_sec * (u_int)1000;
568	curtime += (u_int)tt.tv_usec / (u_int)1000;
569
570	if ((tt.tv_usec % 1000) >= 500)
571	curtime++;
572	#endif
573	}
574
575	#ifdef RT_OS_WINDOWS
576	void slirp_select_fill(PNATState pData, int *pnfds)
577	#else /* RT_OS_WINDOWS */
578	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
579	#endif /* !RT_OS_WINDOWS */
580	{
581	struct socket so, so_next;
582	int nfds;
583	#if defined(RT_OS_WINDOWS)
584	int rc;
585	int error;
586	#else
587	int poll_index = 0;
588	#endif
589	int i;
590
591	STAM_PROFILE_START(&pData->StatFill, a);
592
593	nfds = *pnfds;
594
595	/*
596	* First, TCP sockets
597	*/
598	do_slowtimo = 0;
599	if (!link_up)
600	goto done;
601
602	/*
603	* *_slowtimo needs calling if there are IP fragments
604	* in the fragment queue, or there are TCP connections active
605	*/
606	/* XXX:
607	* triggering of fragment expiration should be the same but use new macroses
608	*/
609	do_slowtimo = (tcb.so_next != &tcb);
610	if (!do_slowtimo)
611	{
612	for (i = 0; i < IPREASS_NHASH; i++)
613	{
614	if (!TAILQ_EMPTY(&ipq[i]))
615	{
616	do_slowtimo = 1;
617	break;
618	}
619	}
620	}
621	/* always add the ICMP socket */
622	#ifndef RT_OS_WINDOWS
623	pData->icmp_socket.so_poll_index = -1;
624	#endif
625	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
626
627	STAM_COUNTER_RESET(&pData->StatTCP);
628	STAM_COUNTER_RESET(&pData->StatTCPHot);
629
630	QSOCKET_FOREACH(so, so_next, tcp)
631	/* { */
632	Assert(so->so_type == IPPROTO_TCP);
633	#if !defined(RT_OS_WINDOWS)
634	so->so_poll_index = -1;
635	#endif
636	STAM_COUNTER_INC(&pData->StatTCP);
637	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
638	/* TCP socket can't be cloned */
639	Assert((!so->so_cloneOf));
640	#endif
641	/*
642	* See if we need a tcp_fasttimo
643	*/
644	if ( time_fasttimo == 0
645	&& so->so_tcpcb != NULL
646	&& so->so_tcpcb->t_flags & TF_DELACK)
647	{
648	time_fasttimo = curtime; /* Flag when we want a fasttimo */
649	}
650
651	/*
652	* NOFDREF can include still connecting to local-host,
653	* newly socreated() sockets etc. Don't want to select these.
654	*/
655	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
656	CONTINUE(tcp);
657
658	/*
659	* Set for reading sockets which are accepting
660	*/
661	if (so->so_state & SS_FACCEPTCONN)
662	{
663	STAM_COUNTER_INC(&pData->StatTCPHot);
664	TCP_ENGAGE_EVENT1(so, readfds);
665	CONTINUE(tcp);
666	}
667
668	/*
669	* Set for writing sockets which are connecting
670	*/
671	if (so->so_state & SS_ISFCONNECTING)
672	{
673	Log2(("connecting %R[natsock] engaged\n",so));
674	STAM_COUNTER_INC(&pData->StatTCPHot);
675	#ifdef RT_OS_WINDOWS
676	WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
677	#else
678	TCP_ENGAGE_EVENT1(so, writefds);
679	#endif
680	}
681
682	/*
683	* Set for writing if we are connected, can send more, and
684	* we have something to send
685	*/
686	if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
687	{
688	STAM_COUNTER_INC(&pData->StatTCPHot);
689	TCP_ENGAGE_EVENT1(so, writefds);
690	}
691
692	/*
693	* Set for reading (and urgent data) if we are connected, can
694	* receive more, and we have room for it XXX /2 ?
695	*/
696	/* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
697	if ( CONN_CANFRCV(so)
698	&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
699	#ifdef RT_OS_WINDOWS
700	&& !(so->so_state & SS_ISFCONNECTING)
701	#endif
702	)
703	{
704	STAM_COUNTER_INC(&pData->StatTCPHot);
705	TCP_ENGAGE_EVENT2(so, readfds, xfds);
706	}
707	LOOP_LABEL(tcp, so, so_next);
708	}
709
710	/*
711	* UDP sockets
712	*/
713	STAM_COUNTER_RESET(&pData->StatUDP);
714	STAM_COUNTER_RESET(&pData->StatUDPHot);
715
716	QSOCKET_FOREACH(so, so_next, udp)
717	/* { */
718
719	Assert(so->so_type == IPPROTO_UDP);
720	STAM_COUNTER_INC(&pData->StatUDP);
721	#if !defined(RT_OS_WINDOWS)
722	so->so_poll_index = -1;
723	#endif
724
725	/*
726	* See if it's timed out
727	*/
728	if (so->so_expire)
729	{
730	if (so->so_expire <= curtime)
731	{
732	Log2(("NAT: %R[natsock] expired\n", so));
733	if (so->so_timeout != NULL)
734	{
735	so->so_timeout(pData, so, so->so_timeout_arg);
736	}
737	UDP_DETACH(pData, so, so_next);
738	CONTINUE_NO_UNLOCK(udp);
739	}
740	}
741	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
742	if (so->so_cloneOf)
743	CONTINUE_NO_UNLOCK(udp);
744	#endif
745
746	/*
747	* When UDP packets are received from over the link, they're
748	* sendto()'d straight away, so no need for setting for writing
749	* Limit the number of packets queued by this session to 4.
750	* Note that even though we try and limit this to 4 packets,
751	* the session could have more queued if the packets needed
752	* to be fragmented.
753	*
754	* (XXX <= 4 ?)
755	*/
756	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
757	{
758	STAM_COUNTER_INC(&pData->StatUDPHot);
759	UDP_ENGAGE_EVENT(so, readfds);
760	}
761	LOOP_LABEL(udp, so, so_next);
762	}
763	done:
764
765	#if defined(RT_OS_WINDOWS)
766	*pnfds = VBOX_EVENT_COUNT;
767	#else /* RT_OS_WINDOWS */
768	AssertRelease(poll_index <= *pnfds);
769	*pnfds = poll_index;
770	#endif /* !RT_OS_WINDOWS */
771
772	STAM_PROFILE_STOP(&pData->StatFill, a);
773	}
774
775
776	/**
777	* This function do Connection or sending tcp sequence to.
778	* @returns if true operation completed
779	* @note: functions call tcp_input that potentially could lead to tcp_drop
780	*/
781	static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
782	{
783	int ret;
784	LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
785	/*
786	* Check for non-blocking, still-connecting sockets
787	*/
788	if (so->so_state & SS_ISFCONNECTING)
789	{
790	Log2(("connecting %R[natsock] catched\n", so));
791	/* Connected */
792	so->so_state &= ~SS_ISFCONNECTING;
793
794	/*
795	* This should be probably guarded by PROBE_CONN too. Anyway,
796	* we disable it on OS/2 because the below send call returns
797	* EFAULT which causes the opened TCP socket to close right
798	* after it has been opened and connected.
799	*/
800	#ifndef RT_OS_OS2
801	ret = send(so->s, (const char *)&ret, 0, 0);
802	if (ret < 0)
803	{
804	/* XXXXX Must fix, zero bytes is a NOP */
805	if ( soIgnorableErrorCode(errno)
806	\|\| errno == ENOTCONN)
807	{
808	LogFlowFunc(("LEAVE: false\n"));
809	return false;
810	}
811
812	/* else failed */
813	so->so_state = SS_NOFDREF;
814	}
815	/* else so->so_state &= ~SS_ISFCONNECTING; */
816	#endif
817
818	/*
819	* Continue tcp_input
820	*/
821	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
822	/* continue; */
823	}
824	else if (!fConnectOnly)
825	SOWRITE(ret, pData, so);
826	/*
827	* XXX If we wrote something (a lot), there could be the need
828	* for a window update. In the worst case, the remote will send
829	* a window probe to get things going again.
830	*/
831	LogFlowFunc(("LEAVE: true\n"));
832	return true;
833	}
834
835	#if defined(RT_OS_WINDOWS)
836	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
837	#else /* RT_OS_WINDOWS */
838	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
839	#endif /* !RT_OS_WINDOWS */
840	{
841	struct socket so, so_next;
842	int ret;
843	#if defined(RT_OS_WINDOWS)
844	WSANETWORKEVENTS NetworkEvents;
845	int rc;
846	int error;
847	#endif
848
849	STAM_PROFILE_START(&pData->StatPoll, a);
850
851	/* Update time */
852	updtime(pData);
853
854	/*
855	* See if anything has timed out
856	*/
857	if (link_up)
858	{
859	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
860	{
861	STAM_PROFILE_START(&pData->StatFastTimer, b);
862	tcp_fasttimo(pData);
863	time_fasttimo = 0;
864	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
865	}
866	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
867	{
868	STAM_PROFILE_START(&pData->StatSlowTimer, c);
869	ip_slowtimo(pData);
870	tcp_slowtimo(pData);
871	last_slowtimo = curtime;
872	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
873	}
874	}
875	#if defined(RT_OS_WINDOWS)
876	if (fTimeout)
877	return; /* only timer update */
878	#endif
879
880	/*
881	* Check sockets
882	*/
883	if (!link_up)
884	goto done;
885	#if defined(RT_OS_WINDOWS)
886	/*XXX: before renaming please make see define
887	* fIcmp in slirp_state.h
888	*/
889	if (fIcmp)
890	sorecvfrom(pData, &pData->icmp_socket);
891	#else
892	if ( (pData->icmp_socket.s != -1)
893	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
894	sorecvfrom(pData, &pData->icmp_socket);
895	#endif
896	/*
897	* Check TCP sockets
898	*/
899	QSOCKET_FOREACH(so, so_next, tcp)
900	/* { */
901	/* TCP socket can't be cloned */
902	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
903	Assert((!so->so_cloneOf));
904	#endif
905	Assert(!so->fUnderPolling);
906	so->fUnderPolling = 1;
907	if (slirpVerifyAndFreeSocket(pData, so))
908	CONTINUE(tcp);
909	/*
910	* FD_ISSET is meaningless on these sockets
911	* (and they can crash the program)
912	*/
913	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
914	{
915	so->fUnderPolling = 0;
916	CONTINUE(tcp);
917	}
918
919	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
920
921	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
922
923
924	/*
925	* Check for URG data
926	* This will soread as well, so no need to
927	* test for readfds below if this succeeds
928	*/
929
930	/* out-of-band data */
931	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
932	#ifdef RT_OS_DARWIN
933	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
934	* combination on other Unixs hosts doesn't enter to this branch
935	*/
936	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
937	#endif
938	#ifdef RT_OS_WINDOWS
939	/**
940	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
941	*/
942	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
943	#endif
944	)
945	{
946	sorecvoob(pData, so);
947	if (slirpVerifyAndFreeSocket(pData, so))
948	CONTINUE(tcp);
949	}
950
951	/*
952	* Check sockets for reading
953	*/
954	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
955	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
956	{
957
958	#ifdef RT_OS_WINDOWS
959	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
960	{
961	/* Finish connection first */
962	/* should we ignore return value? */
963	bool fRet = slirpConnectOrWrite(pData, so, true);
964	LogFunc(("fRet:%RTbool\n", fRet));
965	if (slirpVerifyAndFreeSocket(pData, so))
966	CONTINUE(tcp);
967	}
968	#endif
969	/*
970	* Check for incoming connections
971	*/
972	if (so->so_state & SS_FACCEPTCONN)
973	{
974	TCP_CONNECT(pData, so);
975	if (slirpVerifyAndFreeSocket(pData, so))
976	CONTINUE(tcp);
977	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
978	{
979	so->fUnderPolling = 0;
980	CONTINUE(tcp);
981	}
982	}
983
984	ret = soread(pData, so);
985	if (slirpVerifyAndFreeSocket(pData, so))
986	CONTINUE(tcp);
987	/* Output it if we read something */
988	if (RT_LIKELY(ret > 0))
989	TCP_OUTPUT(pData, sototcpcb(so));
990
991	if (slirpVerifyAndFreeSocket(pData, so))
992	CONTINUE(tcp);
993	}
994
995	/*
996	* Check for FD_CLOSE events.
997	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
998	*/
999	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1000	\|\| (so->so_close == 1))
1001	{
1002	/*
1003	* drain the socket
1004	*/
1005	for (; so_next->so_prev == so
1006	&& !slirpVerifyAndFreeSocket(pData, so);)
1007	{
1008	ret = soread(pData, so);
1009	if (slirpVerifyAndFreeSocket(pData, so))
1010	break;
1011
1012	if (ret > 0)
1013	TCP_OUTPUT(pData, sototcpcb(so));
1014	else if (so_next->so_prev == so)
1015	{
1016	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1017	break;
1018	}
1019	}
1020
1021	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1022	if (so_next->so_prev == so)
1023	{
1024	/* mark the socket for termination _after_ it was drained */
1025	so->so_close = 1;
1026	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1027	* Actually in the specific error scenario, POLLERR is set as well. */
1028	#ifndef RT_OS_WINDOWS
1029	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1030	sofcantsendmore(so);
1031	#endif
1032	}
1033	if (so_next->so_prev == so)
1034	so->fUnderPolling = 0;
1035	CONTINUE(tcp);
1036	}
1037
1038	/*
1039	* Check sockets for writing
1040	*/
1041	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1042	#ifdef RT_OS_WINDOWS
1043	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1044	#endif
1045	)
1046	{
1047	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1048	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1049	* so we should be ready to such situations.
1050	*/
1051	if (slirpVerifyAndFreeSocket(pData, so))
1052	CONTINUE(tcp);
1053	else if (!fConnectOrWriteSuccess)
1054	{
1055	so->fUnderPolling = 0;
1056	CONTINUE(tcp);
1057	}
1058	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1059	}
1060
1061	/*
1062	* Probe a still-connecting, non-blocking socket
1063	* to check if it's still alive
1064	*/
1065	#ifdef PROBE_CONN
1066	if (so->so_state & SS_ISFCONNECTING)
1067	{
1068	ret = recv(so->s, (char *)&ret, 0, 0);
1069
1070	if (ret < 0)
1071	{
1072	/* XXX */
1073	if ( soIgnorableErrorCode(errno)
1074	\|\| errno == ENOTCONN)
1075	{
1076	CONTINUE(tcp); /* Still connecting, continue */
1077	}
1078
1079	/* else failed */
1080	so->so_state = SS_NOFDREF;
1081
1082	/* tcp_input will take care of it */
1083	}
1084	else
1085	{
1086	ret = send(so->s, &ret, 0, 0);
1087	if (ret < 0)
1088	{
1089	/* XXX */
1090	if ( soIgnorableErrorCode(errno)
1091	\|\| errno == ENOTCONN)
1092	{
1093	CONTINUE(tcp);
1094	}
1095	/* else failed */
1096	so->so_state = SS_NOFDREF;
1097	}
1098	else
1099	so->so_state &= ~SS_ISFCONNECTING;
1100
1101	}
1102	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1103	} /* SS_ISFCONNECTING */
1104	#endif
1105	if (!slirpVerifyAndFreeSocket(pData, so))
1106	so->fUnderPolling = 0;
1107	LOOP_LABEL(tcp, so, so_next);
1108	}
1109
1110	/*
1111	* Now UDP sockets.
1112	* Incoming packets are sent straight away, they're not buffered.
1113	* Incoming UDP data isn't buffered either.
1114	*/
1115	QSOCKET_FOREACH(so, so_next, udp)
1116	/* { */
1117	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1118	if (so->so_cloneOf)
1119	CONTINUE_NO_UNLOCK(udp);
1120	#endif
1121	#if 0
1122	so->fUnderPolling = 1;
1123	if(slirpVerifyAndFreeSocket(pData, so));
1124	CONTINUE(udp);
1125	so->fUnderPolling = 0;
1126	#endif
1127
1128	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1129
1130	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1131
1132	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1133	{
1134	SORECVFROM(pData, so);
1135	}
1136	LOOP_LABEL(udp, so, so_next);
1137	}
1138
1139	done:
1140
1141	STAM_PROFILE_STOP(&pData->StatPoll, a);
1142	}
1143
1144
1145	struct arphdr
1146	{
1147	unsigned short ar_hrd; /* format of hardware address */
1148	unsigned short ar_pro; /* format of protocol address */
1149	unsigned char ar_hln; /* length of hardware address */
1150	unsigned char ar_pln; /* length of protocol address */
1151	unsigned short ar_op; /* ARP opcode (command) */
1152
1153	/*
1154	* Ethernet looks like this : This bit is variable sized however...
1155	*/
1156	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1157	unsigned char ar_sip[4]; /* sender IP address */
1158	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1159	unsigned char ar_tip[4]; /* target IP address */
1160	};
1161	AssertCompileSize(struct arphdr, 28);
1162
1163	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1164	{
1165	struct ethhdr *pEtherHeaderResponse;
1166	struct arphdr *pARPHeaderResponse;
1167	uint32_t ip4TargetAddressInHostFormat;
1168	struct mbuf *pMbufResponse;
1169
1170	Assert((pcu8EtherSource));
1171	if (!pcu8EtherSource)
1172	return;
1173	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1174
1175	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1176	if (!pMbufResponse)
1177	return;
1178	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1179	/* @note: if_encap will swap src and dst*/
1180	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1181	pMbufResponse->m_data += ETH_HLEN;
1182	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1183	pMbufResponse->m_len = sizeof(struct arphdr);
1184
1185	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1186	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1187	pARPHeaderResponse->ar_hln = ETH_ALEN;
1188	pARPHeaderResponse->ar_pln = 4;
1189	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1190	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1191
1192	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1193	{
1194	static bool fTagErrorReported;
1195	if (!fTagErrorReported)
1196	{
1197	LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
1198	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1199	fTagErrorReported = true;
1200	}
1201	}
1202	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1203
1204	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1205	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1206	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1207	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1208	}
1209	/**
1210	* @note This function will free m!
1211	*/
1212	static void arp_input(PNATState pData, struct mbuf *m)
1213	{
1214	struct ethhdr *pEtherHeader;
1215	struct arphdr *pARPHeader;
1216	uint32_t ip4TargetAddress;
1217
1218	int ar_op;
1219	pEtherHeader = mtod(m, struct ethhdr *);
1220	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1221
1222	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1223	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1224
1225	switch (ar_op)
1226	{
1227	case ARPOP_REQUEST:
1228	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1229	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1230	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1231	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1232
1233	/* Gratuitous ARP */
1234	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1235	&& memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1236	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1237	{
1238	/* We've received an announce about address assignment,
1239	* let's do an ARP cache update
1240	*/
1241	static bool fGratuitousArpReported;
1242	if (!fGratuitousArpReported)
1243	{
1244	LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
1245	pARPHeader->ar_sip, pARPHeader->ar_sha));
1246	fGratuitousArpReported = true;
1247	}
1248	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1249	}
1250	break;
1251
1252	case ARPOP_REPLY:
1253	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1254	break;
1255
1256	default:
1257	break;
1258	}
1259
1260	m_freem(pData, m);
1261	}
1262
1263	/**
1264	* Feed a packet into the slirp engine.
1265	*
1266	* @param m Data buffer, m_len is not valid.
1267	* @param cbBuf The length of the data in m.
1268	*/
1269	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1270	{
1271	int proto;
1272	static bool fWarnedIpv6;
1273	struct ethhdr *eh;
1274	uint8_t au8Ether[ETH_ALEN];
1275
1276	m->m_len = cbBuf;
1277	if (cbBuf < ETH_HLEN)
1278	{
1279	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1280	m_freem(pData, m);
1281	return;
1282	}
1283	eh = mtod(m, struct ethhdr *);
1284	proto = RT_N2H_U16(eh->h_proto);
1285
1286	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1287
1288	switch(proto)
1289	{
1290	case ETH_P_ARP:
1291	arp_input(pData, m);
1292	break;
1293
1294	case ETH_P_IP:
1295	/* Update time. Important if the network is very quiet, as otherwise
1296	* the first outgoing connection gets an incorrect timestamp. */
1297	updtime(pData);
1298	m_adj(m, ETH_HLEN);
1299	M_ASSERTPKTHDR(m);
1300	m->m_pkthdr.header = mtod(m, void *);
1301	ip_input(pData, m);
1302	break;
1303
1304	case ETH_P_IPV6:
1305	m_freem(pData, m);
1306	if (!fWarnedIpv6)
1307	{
1308	LogRel(("NAT: IPv6 not supported\n"));
1309	fWarnedIpv6 = true;
1310	}
1311	break;
1312
1313	default:
1314	Log(("NAT: Unsupported protocol %x\n", proto));
1315	m_freem(pData, m);
1316	break;
1317	}
1318
1319	if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1320	activate_port_forwarding(pData, au8Ether);
1321	}
1322
1323	/**
1324	* Output the IP packet to the ethernet device.
1325	*
1326	* @note This function will free m!
1327	*/
1328	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1329	{
1330	struct ethhdr *eh;
1331	uint8_t *mbuf = NULL;
1332	size_t mlen = 0;
1333	STAM_PROFILE_START(&pData->StatIF_encap, a);
1334	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1335	pData, eth_proto, m, flags));
1336
1337	M_ASSERTPKTHDR(m);
1338	m->m_data -= ETH_HLEN;
1339	m->m_len += ETH_HLEN;
1340	eh = mtod(m, struct ethhdr *);
1341	mlen = m->m_len;
1342
1343	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1344	{
1345	struct m_tag *t = m_tag_first(m);
1346	uint8_t u8ServiceId = CTL_ALIAS;
1347	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1348	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1349	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1350	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1351	{
1352	/* don't do anything */
1353	m_freem(pData, m);
1354	goto done;
1355	}
1356	if ( t
1357	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1358	{
1359	Assert(t);
1360	u8ServiceId = (uint8_t )&t[1];
1361	}
1362	eh->h_source[5] = u8ServiceId;
1363	}
1364	/*
1365	* we're processing the chain, that isn't not expected.
1366	*/
1367	Assert((!m->m_next));
1368	if (m->m_next)
1369	{
1370	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1371	m_freem(pData, m);
1372	goto done;
1373	}
1374	mbuf = mtod(m, uint8_t *);
1375	eh->h_proto = RT_H2N_U16(eth_proto);
1376	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1377	if (flags & ETH_ENCAP_URG)
1378	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1379	else
1380	slirp_output(pData->pvUser, m, mbuf, mlen);
1381	done:
1382	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1383	LogFlowFuncLeave();
1384	}
1385
1386	/**
1387	* Still we're using dhcp server leasing to map ether to IP
1388	* @todo see rt_lookup_in_cache
1389	*/
1390	static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1391	{
1392	uint32_t ip = INADDR_ANY;
1393	int rc;
1394
1395	if (eth_addr == NULL)
1396	return INADDR_ANY;
1397
1398	if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1399	\|\| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1400	return INADDR_ANY;
1401
1402	rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1403	if (RT_SUCCESS(rc))
1404	return ip;
1405
1406	bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1407	/* ignore return code, ip will be set to INADDR_ANY on error */
1408	return ip;
1409	}
1410
1411	/**
1412	* We need check if we've activated port forwarding
1413	* for specific machine ... that of course relates to
1414	* service mode
1415	* @todo finish this for service case
1416	*/
1417	static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1418	{
1419	struct port_forward_rule rule, tmp;
1420	const uint8_t *pu8EthSource = h_source;
1421
1422	/* check mac here */
1423	LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1424	{
1425	struct socket *so;
1426	struct alias_link *alias_link;
1427	struct libalias *lib;
1428	int flags;
1429	struct sockaddr sa;
1430	struct sockaddr_in *psin;
1431	socklen_t socketlen;
1432	struct in_addr alias;
1433	int rc;
1434	uint32_t guest_addr; /* need to understand if we already give address to guest */
1435
1436	if (rule->activated)
1437	continue;
1438
1439	#ifdef VBOX_WITH_NAT_SERVICE
1440	/**
1441	* case when guest ip is INADDR_ANY shouldn't appear in NAT service
1442	*/
1443	Assert((rule->guest_addr.s_addr != INADDR_ANY));
1444	guest_addr = rule->guest_addr.s_addr;
1445	#else /* VBOX_WITH_NAT_SERVICE */
1446	guest_addr = find_guest_ip(pData, pu8EthSource);
1447	#endif /* !VBOX_WITH_NAT_SERVICE */
1448	if (guest_addr == INADDR_ANY)
1449	{
1450	/* the address wasn't granted */
1451	return;
1452	}
1453
1454	#if !defined(VBOX_WITH_NAT_SERVICE)
1455	if ( rule->guest_addr.s_addr != guest_addr
1456	&& rule->guest_addr.s_addr != INADDR_ANY)
1457	continue;
1458	if (rule->guest_addr.s_addr == INADDR_ANY)
1459	rule->guest_addr.s_addr = guest_addr;
1460	#endif
1461
1462	LogRel(("NAT: set redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1463	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1464
1465	if (rule->proto == IPPROTO_UDP)
1466	so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1467	RT_H2N_U16(rule->guest_port), 0);
1468	else
1469	so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1470	RT_H2N_U16(rule->guest_port), 0);
1471
1472	if (so == NULL)
1473	goto remove_port_forwarding;
1474
1475	psin = (struct sockaddr_in *)&sa;
1476	psin->sin_family = AF_INET;
1477	psin->sin_port = 0;
1478	psin->sin_addr.s_addr = INADDR_ANY;
1479	socketlen = sizeof(struct sockaddr);
1480
1481	rc = getsockname(so->s, &sa, &socketlen);
1482	if (rc < 0 \|\| sa.sa_family != AF_INET)
1483	goto remove_port_forwarding;
1484
1485	psin = (struct sockaddr_in *)&sa;
1486
1487	lib = LibAliasInit(pData, NULL);
1488	flags = LibAliasSetMode(lib, 0, 0);
1489	flags \|= pData->i32AliasMode;
1490	flags \|= PKT_ALIAS_REVERSE; /* set reverse */
1491	flags = LibAliasSetMode(lib, flags, ~0);
1492
1493	alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) \| CTL_ALIAS);
1494	alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
1495	alias, RT_H2N_U16(rule->guest_port),
1496	pData->special_addr, -1, /* not very clear for now */
1497	rule->proto);
1498	if (!alias_link)
1499	goto remove_port_forwarding;
1500
1501	so->so_la = lib;
1502	rule->activated = 1;
1503	rule->so = so;
1504	pData->cRedirectionsActive++;
1505	continue;
1506
1507	remove_port_forwarding:
1508	LogRel(("NAT: failed to redirect %s %d => %d\n",
1509	(rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
1510	LIST_REMOVE(rule, list);
1511	pData->cRedirectionsStored--;
1512	RTMemFree(rule);
1513	}
1514	}
1515
1516	/**
1517	* Changes in 3.1 instead of opening new socket do the following:
1518	* gain more information:
1519	* 1. bind IP
1520	* 2. host port
1521	* 3. guest port
1522	* 4. proto
1523	* 5. guest MAC address
1524	* the guest's MAC address is rather important for service, but we easily
1525	* could get it from VM configuration in DrvNAT or Service, the idea is activating
1526	* corresponding port-forwarding
1527	*/
1528	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1529	struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1530	{
1531	struct port_forward_rule *rule = NULL;
1532	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1533	{
1534	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1535	&& rule->host_port == host_port
1536	&& rule->bind_ip.s_addr == host_addr.s_addr
1537	&& rule->guest_port == guest_port
1538	&& rule->guest_addr.s_addr == guest_addr.s_addr
1539	)
1540	return 0; /* rule has been already registered */
1541	}
1542
1543	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1544	if (rule == NULL)
1545	return 1;
1546
1547	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1548	rule->host_port = host_port;
1549	rule->guest_port = guest_port;
1550	rule->guest_addr.s_addr = guest_addr.s_addr;
1551	rule->bind_ip.s_addr = host_addr.s_addr;
1552	if (ethaddr != NULL)
1553	memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1554	/* @todo add mac address */
1555	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1556	pData->cRedirectionsStored++;
1557	/* activate port-forwarding if guest has already got assigned IP */
1558	if ( ethaddr
1559	&& memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
1560	activate_port_forwarding(pData, ethaddr);
1561	return 0;
1562	}
1563
1564	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1565	struct in_addr guest_addr, int guest_port)
1566	{
1567	struct port_forward_rule *rule = NULL;
1568	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1569	{
1570	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1571	&& rule->host_port == host_port
1572	&& rule->guest_port == guest_port
1573	&& rule->bind_ip.s_addr == host_addr.s_addr
1574	&& rule->guest_addr.s_addr == guest_addr.s_addr
1575	&& rule->activated)
1576	{
1577	LogRel(("NAT: remove redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1578	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1579
1580	LibAliasUninit(rule->so->so_la);
1581	if (is_udp)
1582	udp_detach(pData, rule->so);
1583	else
1584	tcp_close(pData, sototcpcb(rule->so));
1585	LIST_REMOVE(rule, list);
1586	RTMemFree(rule);
1587	pData->cRedirectionsStored--;
1588	break;
1589	}
1590
1591	}
1592	return 0;
1593	}
1594
1595	void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1596	{
1597	#ifndef VBOX_WITH_NAT_SERVICE
1598	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1599	#endif
1600	if (GuestIP != INADDR_ANY)
1601	{
1602	slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1603	activate_port_forwarding(pData, ethaddr);
1604	}
1605	}
1606
1607	#if defined(RT_OS_WINDOWS)
1608	HANDLE *slirp_get_events(PNATState pData)
1609	{
1610	return pData->phEvents;
1611	}
1612	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1613	{
1614	pData->phEvents[index] = hEvent;
1615	}
1616	#endif
1617
1618	unsigned int slirp_get_timeout_ms(PNATState pData)
1619	{
1620	if (link_up)
1621	{
1622	if (time_fasttimo)
1623	return 2;
1624	if (do_slowtimo)
1625	return 500; /* see PR_SLOWHZ */
1626	}
1627	return 36001000; / one hour */
1628	}
1629
1630	#ifndef RT_OS_WINDOWS
1631	int slirp_get_nsock(PNATState pData)
1632	{
1633	return pData->nsock;
1634	}
1635	#endif
1636
1637	/*
1638	* this function called from NAT thread
1639	*/
1640	void slirp_post_sent(PNATState pData, void *pvArg)
1641	{
1642	struct mbuf m = (struct mbuf )pvArg;
1643	m_freem(pData, m);
1644	}
1645
1646	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1647	{
1648	Log2(("tftp_prefix: %s\n", tftpPrefix));
1649	tftp_prefix = tftpPrefix;
1650	}
1651
1652	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1653	{
1654	Log2(("bootFile: %s\n", bootFile));
1655	bootp_filename = bootFile;
1656	}
1657
1658	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1659	{
1660	Log2(("next_server: %s\n", next_server));
1661	if (next_server == NULL)
1662	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1663	else
1664	inet_aton(next_server, &pData->tftp_server);
1665	}
1666
1667	int slirp_set_binding_address(PNATState pData, char *addr)
1668	{
1669	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1670	{
1671	pData->bindIP.s_addr = INADDR_ANY;
1672	return 1;
1673	}
1674	return 0;
1675	}
1676
1677	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1678	{
1679	if (!pData->fUseHostResolver)
1680	{
1681	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1682	pData->fUseDnsProxy = fDNSProxy;
1683	}
1684	else if (fDNSProxy)
1685	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1686	}
1687
1688	#define CHECK_ARG(name, val, lim_min, lim_max) \
1689	do { \
1690	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1691	{ \
1692	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1693	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1694	return; \
1695	} \
1696	else \
1697	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1698	} while (0)
1699
1700	void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1701	{
1702	LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
1703	/* Conditions */
1704	if (iSoMaxConn > SOMAXCONN)
1705	{
1706	LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1707	iSoMaxConn = SOMAXCONN;
1708	}
1709
1710	if (iSoMaxConn < 1)
1711	{
1712	LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1713	LogFlowFuncLeave();
1714	return;
1715	}
1716
1717	/* Asignment */
1718	if (pData->soMaxConn != iSoMaxConn)
1719	{
1720	LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1721	pData->soMaxConn, iSoMaxConn));
1722	pData->soMaxConn = iSoMaxConn;
1723	}
1724	LogFlowFuncLeave();
1725	}
1726	/* don't allow user set less 8kB and more than 1M values */
1727	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1728	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1729	{
1730	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1731	pData->socket_rcv = kilobytes;
1732	}
1733	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1734	{
1735	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1736	pData->socket_snd = kilobytes * _1K;
1737	}
1738	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1739	{
1740	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1741	tcp_rcvspace = kilobytes * _1K;
1742	}
1743	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1744	{
1745	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1746	tcp_sndspace = kilobytes * _1K;
1747	}
1748
1749	/*
1750	* Looking for Ether by ip in ARP-cache
1751	* Note: it´s responsible of caller to allocate buffer for result
1752	* @returns iprt status code
1753	*/
1754	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1755	{
1756	struct arp_cache_entry *ac;
1757
1758	if (ether == NULL)
1759	return VERR_INVALID_PARAMETER;
1760
1761	if (LIST_EMPTY(&pData->arp_cache))
1762	return VERR_NOT_FOUND;
1763
1764	LIST_FOREACH(ac, &pData->arp_cache, list)
1765	{
1766	if ( ac->ip == ip
1767	&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1768	{
1769	memcpy(ether, ac->ether, ETH_ALEN);
1770	return VINF_SUCCESS;
1771	}
1772	}
1773	return VERR_NOT_FOUND;
1774	}
1775
1776	/*
1777	* Looking for IP by Ether in ARP-cache
1778	* Note: it´s responsible of caller to allocate buffer for result
1779	* @returns 0 - if found, 1 - otherwise
1780	*/
1781	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1782	{
1783	struct arp_cache_entry *ac;
1784	*ip = INADDR_ANY;
1785
1786	if (LIST_EMPTY(&pData->arp_cache))
1787	return VERR_NOT_FOUND;
1788
1789	LIST_FOREACH(ac, &pData->arp_cache, list)
1790	{
1791	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1792	{
1793	*ip = ac->ip;
1794	return VINF_SUCCESS;
1795	}
1796	}
1797	return VERR_NOT_FOUND;
1798	}
1799
1800	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1801	{
1802	struct mbuf *m;
1803	struct ethhdr *ehdr;
1804	struct arphdr *ahdr;
1805	static bool fWarned = false;
1806	LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1807
1808	/* ARP request WHO HAS 0.0.0.0 is one of the signals
1809	* that something has been broken at Slirp. Investigating
1810	* pcap dumps it's easy to miss warning ARP requests being
1811	* focused on investigation of other protocols flow.
1812	*/
1813	#ifdef DEBUG_vvl
1814	Assert((dst != INADDR_ANY));
1815	NOREF(fWarned);
1816	#else
1817	if ( dst == INADDR_ANY
1818	&& !fWarned)
1819	{
1820	LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1821	fWarned = true;
1822	}
1823	#endif /* !DEBUG_vvl */
1824
1825	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1826	if (m == NULL)
1827	{
1828	Log(("NAT: Can't alloc mbuf for ARP request\n"));
1829	LogFlowFuncLeave();
1830	return;
1831	}
1832	ehdr = mtod(m, struct ethhdr *);
1833	memset(ehdr->h_source, 0xff, ETH_ALEN);
1834	ahdr = (struct arphdr *)&ehdr[1];
1835	ahdr->ar_hrd = RT_H2N_U16_C(1);
1836	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1837	ahdr->ar_hln = ETH_ALEN;
1838	ahdr->ar_pln = 4;
1839	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1840	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1841	/* we assume that this request come from gw, but not from DNS or TFTP */
1842	ahdr->ar_sha[5] = CTL_ALIAS;
1843	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1844	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1845	(uint32_t )ahdr->ar_tip = dst;
1846	/* warn!!! should falls in mbuf minimal size */
1847	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1848	m->m_data += ETH_HLEN;
1849	m->m_len -= ETH_HLEN;
1850	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1851	LogFlowFuncLeave();
1852	}
1853	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1854	void slirp_add_host_resolver_mapping(PNATState pData, const char pszHostName, const char pszHostNamePattern, uint32_t u32HostIP)
1855	{
1856	LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1857	pszHostName ? pszHostName : "(null)",
1858	pszHostNamePattern ? pszHostNamePattern : "(null)",
1859	u32HostIP));
1860	if ( ( pszHostName
1861	\|\| pszHostNamePattern)
1862	&& u32HostIP != INADDR_ANY
1863	&& u32HostIP != INADDR_BROADCAST)
1864	{
1865	PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1866	if (!pDnsMapping)
1867	{
1868	LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1869	LogFlowFuncLeave();
1870	return;
1871	}
1872	pDnsMapping->u32IpAddress = u32HostIP;
1873	if (pszHostName)
1874	pDnsMapping->pszCName = RTStrDup(pszHostName);
1875	else if (pszHostNamePattern)
1876	pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1877	if ( !pDnsMapping->pszCName
1878	&& !pDnsMapping->pszPattern)
1879	{
1880	LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1881	RTMemFree(pDnsMapping);
1882	LogFlowFuncLeave();
1883	return;
1884	}
1885	LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1886	LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
1887	pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1888	pDnsMapping->u32IpAddress));
1889	}
1890	LogFlowFuncLeave();
1891	}
1892	#endif
1893
1894	/* updates the arp cache
1895	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1896	* @returns 0 - if has found and updated
1897	* 1 - if hasn't found.
1898	*/
1899	static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1900	{
1901	struct arp_cache_entry *ac;
1902	Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1903	&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1904	LIST_FOREACH(ac, &pData->arp_cache, list)
1905	{
1906	if (!memcmp(ac->ether, mac, ETH_ALEN))
1907	{
1908	ac->ip = dst;
1909	return 0;
1910	}
1911	}
1912	return 1;
1913	}
1914
1915	/**
1916	* add entry to the arp cache
1917	* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1918	*/
1919	static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1920	{
1921	struct arp_cache_entry *ac = NULL;
1922	Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
1923	&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
1924	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1925	if (ac == NULL)
1926	{
1927	Log(("NAT: Can't allocate arp cache entry\n"));
1928	return;
1929	}
1930	ac->ip = ip;
1931	memcpy(ac->ether, ether, ETH_ALEN);
1932	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
1933	}
1934
1935	/* updates or adds entry to the arp cache
1936	* @returns 0 - if has found and updated
1937	* 1 - if hasn't found.
1938	*/
1939	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1940	{
1941	if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1942	\|\| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
1943	{
1944	static bool fBroadcastEtherAddReported;
1945	if (!fBroadcastEtherAddReported)
1946	{
1947	LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
1948	mac, dst));
1949	fBroadcastEtherAddReported = true;
1950	}
1951	return 1;
1952	}
1953	if (slirp_arp_cache_update(pData, dst, mac))
1954	slirp_arp_cache_add(pData, dst, mac);
1955
1956	return 0;
1957	}
1958
1959
1960	void slirp_set_mtu(PNATState pData, int mtu)
1961	{
1962	if (mtu < 20 \|\| mtu >= 16000)
1963	{
1964	LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
1965	mtu = 1500;
1966	}
1967	/* MTU is maximum transition unit on */
1968	if_mtu =
1969	if_mru = mtu;
1970	}
1971
1972	/**
1973	* Info handler.
1974	*/
1975	void slirp_info(PNATState pData, PCDBGFINFOHLP pHlp, const char *pszArgs)
1976	{
1977	struct socket so, so_next;
1978	struct arp_cache_entry *ac;
1979	struct port_forward_rule *rule;
1980	NOREF(pszArgs);
1981
1982	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
1983	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
1984	QSOCKET_FOREACH(so, so_next, tcp)
1985	/* { */
1986	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1987	}
1988
1989	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
1990	QSOCKET_FOREACH(so, so_next, udp)
1991	/* { */
1992	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1993	}
1994
1995	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
1996	LIST_FOREACH(ac, &pData->arp_cache, list)
1997	{
1998	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
1999	}
2000
2001	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2002	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2003	{
2004	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2005	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2006	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2007	rule->activated ? ' ' : '*');
2008	}
2009	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 41987

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