slirp.c@ 41977

Last change on this file since 41977 was 41977, checked in by vboxsync, 12 years ago

NAT: extract DNS functions to slirp_dns.c.

Handle resolv.conf-less Linux distributions.

Property svn:eol-style set to native
Property svn:keywords set to Author Date Id Revision

File size: 63.2 KB

Line
1	/* $Id: slirp.c 41977 2012-07-02 08:52:58Z 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
357	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
358	{
359	Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
360	i32AliasMode = 0;
361	}
362	pData->i32AliasMode = i32AliasMode;
363	getouraddr(pData);
364	{
365	int flags = 0;
366	struct in_addr proxy_addr;
367	pData->proxy_alias = LibAliasInit(pData, NULL);
368	if (pData->proxy_alias == NULL)
369	{
370	Log(("NAT: LibAlias default rule wasn't initialized\n"));
371	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
372	}
373	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
374	#ifndef NO_FW_PUNCH
375	flags \|= PKT_ALIAS_PUNCH_FW;
376	#endif
377	flags \|= pData->i32AliasMode; /* do transparent proxying */
378	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
379	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
380	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
381	ftp_alias_load(pData);
382	nbt_alias_load(pData);
383	if (pData->fUseHostResolver)
384	dns_alias_load(pData);
385	}
386	#ifdef VBOX_WITH_NAT_SEND2HOME
387	/* @todo: we should know all interfaces available on host. */
388	pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
389	pData->cInHomeAddressSize = 1;
390	inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
391	pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
392	# ifdef RT_OS_DARWIN
393	pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
394	# endif
395	#endif
396	return VINF_SUCCESS;
397	}
398
399	/**
400	* Register statistics.
401	*/
402	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
403	{
404	#ifdef VBOX_WITH_STATISTICS
405	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
406	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
407	# include "counters.h"
408	# undef COUNTER
409	/** @todo register statistics for the variables dumped by:
410	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
411	* mbufstats(pData); sockstats(pData); */
412	#else /* VBOX_WITH_STATISTICS */
413	NOREF(pData);
414	NOREF(pDrvIns);
415	#endif /* !VBOX_WITH_STATISTICS */
416	}
417
418	/**
419	* Deregister statistics.
420	*/
421	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
422	{
423	if (pData == NULL)
424	return;
425	#ifdef VBOX_WITH_STATISTICS
426	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
427	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
428	# include "counters.h"
429	#else /* VBOX_WITH_STATISTICS */
430	NOREF(pData);
431	NOREF(pDrvIns);
432	#endif /* !VBOX_WITH_STATISTICS */
433	}
434
435	/**
436	* Marks the link as up, making it possible to establish new connections.
437	*/
438	void slirp_link_up(PNATState pData)
439	{
440	struct arp_cache_entry *ac;
441	link_up = 1;
442
443	if (LIST_EMPTY(&pData->arp_cache))
444	return;
445
446	LIST_FOREACH(ac, &pData->arp_cache, list)
447	{
448	activate_port_forwarding(pData, ac->ether);
449	}
450	}
451
452	/**
453	* Marks the link as down and cleans up the current connections.
454	*/
455	void slirp_link_down(PNATState pData)
456	{
457	struct socket *so;
458	struct port_forward_rule *rule;
459
460	while ((so = tcb.so_next) != &tcb)
461	{
462	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
463	sofree(pData, so);
464	else
465	tcp_drop(pData, sototcpcb(so), 0);
466	}
467
468	while ((so = udb.so_next) != &udb)
469	udp_detach(pData, so);
470
471	/*
472	* Clear the active state of port-forwarding rules to force
473	* re-setup on restoration of communications.
474	*/
475	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
476	{
477	rule->activated = 0;
478	}
479	pData->cRedirectionsActive = 0;
480
481	link_up = 0;
482	}
483
484	/**
485	* Terminates the slirp component.
486	*/
487	void slirp_term(PNATState pData)
488	{
489	if (pData == NULL)
490	return;
491	icmp_finit(pData);
492
493	slirp_link_down(pData);
494	slirpReleaseDnsSettings(pData);
495	ftp_alias_unload(pData);
496	nbt_alias_unload(pData);
497	if (pData->fUseHostResolver)
498	{
499	dns_alias_unload(pData);
500	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
501	while (!LIST_EMPTY(&pData->DNSMapHead))
502	{
503	PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
504	LIST_REMOVE(pDnsEntry, MapList);
505	RTStrFree(pDnsEntry->pszCName);
506	RTMemFree(pDnsEntry);
507	}
508	#endif
509	}
510	while (!LIST_EMPTY(&instancehead))
511	{
512	struct libalias *la = LIST_FIRST(&instancehead);
513	/* libalias do all clean up */
514	LibAliasUninit(la);
515	}
516	while (!LIST_EMPTY(&pData->arp_cache))
517	{
518	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
519	LIST_REMOVE(ac, list);
520	RTMemFree(ac);
521	}
522	bootp_dhcp_fini(pData);
523	m_fini(pData);
524	#ifdef RT_OS_WINDOWS
525	WSACleanup();
526	#endif
527	#ifndef VBOX_WITH_SLIRP_BSD_SBUF
528	#ifdef LOG_ENABLED
529	Log(("\n"
530	"NAT statistics\n"
531	"--------------\n"
532	"\n"));
533	ipstats(pData);
534	tcpstats(pData);
535	udpstats(pData);
536	icmpstats(pData);
537	mbufstats(pData);
538	sockstats(pData);
539	Log(("\n"
540	"\n"
541	"\n"));
542	#endif
543	#endif
544	RTMemFree(pData);
545	}
546
547
548	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
549	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
550
551	/*
552	* curtime kept to an accuracy of 1ms
553	*/
554	static void updtime(PNATState pData)
555	{
556	#ifdef RT_OS_WINDOWS
557	struct _timeb tb;
558
559	_ftime(&tb);
560	curtime = (u_int)tb.time * (u_int)1000;
561	curtime += (u_int)tb.millitm;
562	#else
563	gettimeofday(&tt, 0);
564
565	curtime = (u_int)tt.tv_sec * (u_int)1000;
566	curtime += (u_int)tt.tv_usec / (u_int)1000;
567
568	if ((tt.tv_usec % 1000) >= 500)
569	curtime++;
570	#endif
571	}
572
573	#ifdef RT_OS_WINDOWS
574	void slirp_select_fill(PNATState pData, int *pnfds)
575	#else /* RT_OS_WINDOWS */
576	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
577	#endif /* !RT_OS_WINDOWS */
578	{
579	struct socket so, so_next;
580	int nfds;
581	#if defined(RT_OS_WINDOWS)
582	int rc;
583	int error;
584	#else
585	int poll_index = 0;
586	#endif
587	int i;
588
589	STAM_PROFILE_START(&pData->StatFill, a);
590
591	nfds = *pnfds;
592
593	/*
594	* First, TCP sockets
595	*/
596	do_slowtimo = 0;
597	if (!link_up)
598	goto done;
599
600	/*
601	* *_slowtimo needs calling if there are IP fragments
602	* in the fragment queue, or there are TCP connections active
603	*/
604	/* XXX:
605	* triggering of fragment expiration should be the same but use new macroses
606	*/
607	do_slowtimo = (tcb.so_next != &tcb);
608	if (!do_slowtimo)
609	{
610	for (i = 0; i < IPREASS_NHASH; i++)
611	{
612	if (!TAILQ_EMPTY(&ipq[i]))
613	{
614	do_slowtimo = 1;
615	break;
616	}
617	}
618	}
619	/* always add the ICMP socket */
620	#ifndef RT_OS_WINDOWS
621	pData->icmp_socket.so_poll_index = -1;
622	#endif
623	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
624
625	STAM_COUNTER_RESET(&pData->StatTCP);
626	STAM_COUNTER_RESET(&pData->StatTCPHot);
627
628	QSOCKET_FOREACH(so, so_next, tcp)
629	/* { */
630	Assert(so->so_type == IPPROTO_TCP);
631	#if !defined(RT_OS_WINDOWS)
632	so->so_poll_index = -1;
633	#endif
634	STAM_COUNTER_INC(&pData->StatTCP);
635	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
636	/* TCP socket can't be cloned */
637	Assert((!so->so_cloneOf));
638	#endif
639	/*
640	* See if we need a tcp_fasttimo
641	*/
642	if ( time_fasttimo == 0
643	&& so->so_tcpcb != NULL
644	&& so->so_tcpcb->t_flags & TF_DELACK)
645	{
646	time_fasttimo = curtime; /* Flag when we want a fasttimo */
647	}
648
649	/*
650	* NOFDREF can include still connecting to local-host,
651	* newly socreated() sockets etc. Don't want to select these.
652	*/
653	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
654	CONTINUE(tcp);
655
656	/*
657	* Set for reading sockets which are accepting
658	*/
659	if (so->so_state & SS_FACCEPTCONN)
660	{
661	STAM_COUNTER_INC(&pData->StatTCPHot);
662	TCP_ENGAGE_EVENT1(so, readfds);
663	CONTINUE(tcp);
664	}
665
666	/*
667	* Set for writing sockets which are connecting
668	*/
669	if (so->so_state & SS_ISFCONNECTING)
670	{
671	Log2(("connecting %R[natsock] engaged\n",so));
672	STAM_COUNTER_INC(&pData->StatTCPHot);
673	#ifdef RT_OS_WINDOWS
674	WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
675	#else
676	TCP_ENGAGE_EVENT1(so, writefds);
677	#endif
678	}
679
680	/*
681	* Set for writing if we are connected, can send more, and
682	* we have something to send
683	*/
684	if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
685	{
686	STAM_COUNTER_INC(&pData->StatTCPHot);
687	TCP_ENGAGE_EVENT1(so, writefds);
688	}
689
690	/*
691	* Set for reading (and urgent data) if we are connected, can
692	* receive more, and we have room for it XXX /2 ?
693	*/
694	/* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
695	if ( CONN_CANFRCV(so)
696	&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
697	#ifdef RT_OS_WINDOWS
698	&& !(so->so_state & SS_ISFCONNECTING)
699	#endif
700	)
701	{
702	STAM_COUNTER_INC(&pData->StatTCPHot);
703	TCP_ENGAGE_EVENT2(so, readfds, xfds);
704	}
705	LOOP_LABEL(tcp, so, so_next);
706	}
707
708	/*
709	* UDP sockets
710	*/
711	STAM_COUNTER_RESET(&pData->StatUDP);
712	STAM_COUNTER_RESET(&pData->StatUDPHot);
713
714	QSOCKET_FOREACH(so, so_next, udp)
715	/* { */
716
717	Assert(so->so_type == IPPROTO_UDP);
718	STAM_COUNTER_INC(&pData->StatUDP);
719	#if !defined(RT_OS_WINDOWS)
720	so->so_poll_index = -1;
721	#endif
722
723	/*
724	* See if it's timed out
725	*/
726	if (so->so_expire)
727	{
728	if (so->so_expire <= curtime)
729	{
730	Log2(("NAT: %R[natsock] expired\n", so));
731	if (so->so_timeout != NULL)
732	{
733	so->so_timeout(pData, so, so->so_timeout_arg);
734	}
735	UDP_DETACH(pData, so, so_next);
736	CONTINUE_NO_UNLOCK(udp);
737	}
738	}
739	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
740	if (so->so_cloneOf)
741	CONTINUE_NO_UNLOCK(udp);
742	#endif
743
744	/*
745	* When UDP packets are received from over the link, they're
746	* sendto()'d straight away, so no need for setting for writing
747	* Limit the number of packets queued by this session to 4.
748	* Note that even though we try and limit this to 4 packets,
749	* the session could have more queued if the packets needed
750	* to be fragmented.
751	*
752	* (XXX <= 4 ?)
753	*/
754	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
755	{
756	STAM_COUNTER_INC(&pData->StatUDPHot);
757	UDP_ENGAGE_EVENT(so, readfds);
758	}
759	LOOP_LABEL(udp, so, so_next);
760	}
761	done:
762
763	#if defined(RT_OS_WINDOWS)
764	*pnfds = VBOX_EVENT_COUNT;
765	#else /* RT_OS_WINDOWS */
766	AssertRelease(poll_index <= *pnfds);
767	*pnfds = poll_index;
768	#endif /* !RT_OS_WINDOWS */
769
770	STAM_PROFILE_STOP(&pData->StatFill, a);
771	}
772
773
774	/**
775	* This function do Connection or sending tcp sequence to.
776	* @returns if true operation completed
777	* @note: functions call tcp_input that potentially could lead to tcp_drop
778	*/
779	static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
780	{
781	int ret;
782	LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
783	/*
784	* Check for non-blocking, still-connecting sockets
785	*/
786	if (so->so_state & SS_ISFCONNECTING)
787	{
788	Log2(("connecting %R[natsock] catched\n", so));
789	/* Connected */
790	so->so_state &= ~SS_ISFCONNECTING;
791
792	/*
793	* This should be probably guarded by PROBE_CONN too. Anyway,
794	* we disable it on OS/2 because the below send call returns
795	* EFAULT which causes the opened TCP socket to close right
796	* after it has been opened and connected.
797	*/
798	#ifndef RT_OS_OS2
799	ret = send(so->s, (const char *)&ret, 0, 0);
800	if (ret < 0)
801	{
802	/* XXXXX Must fix, zero bytes is a NOP */
803	if ( soIgnorableErrorCode(errno)
804	\|\| errno == ENOTCONN)
805	{
806	LogFlowFunc(("LEAVE: false\n"));
807	return false;
808	}
809
810	/* else failed */
811	so->so_state = SS_NOFDREF;
812	}
813	/* else so->so_state &= ~SS_ISFCONNECTING; */
814	#endif
815
816	/*
817	* Continue tcp_input
818	*/
819	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
820	/* continue; */
821	}
822	else if (!fConnectOnly)
823	SOWRITE(ret, pData, so);
824	/*
825	* XXX If we wrote something (a lot), there could be the need
826	* for a window update. In the worst case, the remote will send
827	* a window probe to get things going again.
828	*/
829	LogFlowFunc(("LEAVE: true\n"));
830	return true;
831	}
832
833	#if defined(RT_OS_WINDOWS)
834	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
835	#else /* RT_OS_WINDOWS */
836	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
837	#endif /* !RT_OS_WINDOWS */
838	{
839	struct socket so, so_next;
840	int ret;
841	#if defined(RT_OS_WINDOWS)
842	WSANETWORKEVENTS NetworkEvents;
843	int rc;
844	int error;
845	#endif
846
847	STAM_PROFILE_START(&pData->StatPoll, a);
848
849	/* Update time */
850	updtime(pData);
851
852	/*
853	* See if anything has timed out
854	*/
855	if (link_up)
856	{
857	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
858	{
859	STAM_PROFILE_START(&pData->StatFastTimer, b);
860	tcp_fasttimo(pData);
861	time_fasttimo = 0;
862	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
863	}
864	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
865	{
866	STAM_PROFILE_START(&pData->StatSlowTimer, c);
867	ip_slowtimo(pData);
868	tcp_slowtimo(pData);
869	last_slowtimo = curtime;
870	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
871	}
872	}
873	#if defined(RT_OS_WINDOWS)
874	if (fTimeout)
875	return; /* only timer update */
876	#endif
877
878	/*
879	* Check sockets
880	*/
881	if (!link_up)
882	goto done;
883	#if defined(RT_OS_WINDOWS)
884	/*XXX: before renaming please make see define
885	* fIcmp in slirp_state.h
886	*/
887	if (fIcmp)
888	sorecvfrom(pData, &pData->icmp_socket);
889	#else
890	if ( (pData->icmp_socket.s != -1)
891	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
892	sorecvfrom(pData, &pData->icmp_socket);
893	#endif
894	/*
895	* Check TCP sockets
896	*/
897	QSOCKET_FOREACH(so, so_next, tcp)
898	/* { */
899	/* TCP socket can't be cloned */
900	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
901	Assert((!so->so_cloneOf));
902	#endif
903	Assert(!so->fUnderPolling);
904	so->fUnderPolling = 1;
905	if (slirpVerifyAndFreeSocket(pData, so))
906	CONTINUE(tcp);
907	/*
908	* FD_ISSET is meaningless on these sockets
909	* (and they can crash the program)
910	*/
911	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
912	{
913	so->fUnderPolling = 0;
914	CONTINUE(tcp);
915	}
916
917	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
918
919	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
920
921
922	/*
923	* Check for URG data
924	* This will soread as well, so no need to
925	* test for readfds below if this succeeds
926	*/
927
928	/* out-of-band data */
929	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
930	#ifdef RT_OS_DARWIN
931	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
932	* combination on other Unixs hosts doesn't enter to this branch
933	*/
934	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
935	#endif
936	#ifdef RT_OS_WINDOWS
937	/**
938	* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
939	*/
940	&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
941	#endif
942	)
943	{
944	sorecvoob(pData, so);
945	if (slirpVerifyAndFreeSocket(pData, so))
946	CONTINUE(tcp);
947	}
948
949	/*
950	* Check sockets for reading
951	*/
952	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
953	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
954	{
955
956	#ifdef RT_OS_WINDOWS
957	if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
958	{
959	/* Finish connection first */
960	/* should we ignore return value? */
961	bool fRet = slirpConnectOrWrite(pData, so, true);
962	LogFunc(("fRet:%RTbool\n", fRet));
963	if (slirpVerifyAndFreeSocket(pData, so))
964	CONTINUE(tcp);
965	}
966	#endif
967	/*
968	* Check for incoming connections
969	*/
970	if (so->so_state & SS_FACCEPTCONN)
971	{
972	TCP_CONNECT(pData, so);
973	if (slirpVerifyAndFreeSocket(pData, so))
974	CONTINUE(tcp);
975	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
976	{
977	so->fUnderPolling = 0;
978	CONTINUE(tcp);
979	}
980	}
981
982	ret = soread(pData, so);
983	if (slirpVerifyAndFreeSocket(pData, so))
984	CONTINUE(tcp);
985	/* Output it if we read something */
986	if (RT_LIKELY(ret > 0))
987	TCP_OUTPUT(pData, sototcpcb(so));
988
989	if (slirpVerifyAndFreeSocket(pData, so))
990	CONTINUE(tcp);
991	}
992
993	/*
994	* Check for FD_CLOSE events.
995	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
996	*/
997	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
998	\|\| (so->so_close == 1))
999	{
1000	/*
1001	* drain the socket
1002	*/
1003	for (; so_next->so_prev == so
1004	&& !slirpVerifyAndFreeSocket(pData, so);)
1005	{
1006	ret = soread(pData, so);
1007	if (slirpVerifyAndFreeSocket(pData, so))
1008	break;
1009
1010	if (ret > 0)
1011	TCP_OUTPUT(pData, sototcpcb(so));
1012	else if (so_next->so_prev == so)
1013	{
1014	Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1015	break;
1016	}
1017	}
1018
1019	/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1020	if (so_next->so_prev == so)
1021	{
1022	/* mark the socket for termination _after_ it was drained */
1023	so->so_close = 1;
1024	/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1025	* Actually in the specific error scenario, POLLERR is set as well. */
1026	#ifndef RT_OS_WINDOWS
1027	if (CHECK_FD_SET(so, NetworkEvents, rderr))
1028	sofcantsendmore(so);
1029	#endif
1030	}
1031	if (so_next->so_prev == so)
1032	so->fUnderPolling = 0;
1033	CONTINUE(tcp);
1034	}
1035
1036	/*
1037	* Check sockets for writing
1038	*/
1039	if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1040	#ifdef RT_OS_WINDOWS
1041	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1042	#endif
1043	)
1044	{
1045	int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1046	/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1047	* so we should be ready to such situations.
1048	*/
1049	if (slirpVerifyAndFreeSocket(pData, so))
1050	CONTINUE(tcp);
1051	else if (!fConnectOrWriteSuccess)
1052	{
1053	so->fUnderPolling = 0;
1054	CONTINUE(tcp);
1055	}
1056	/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1057	}
1058
1059	/*
1060	* Probe a still-connecting, non-blocking socket
1061	* to check if it's still alive
1062	*/
1063	#ifdef PROBE_CONN
1064	if (so->so_state & SS_ISFCONNECTING)
1065	{
1066	ret = recv(so->s, (char *)&ret, 0, 0);
1067
1068	if (ret < 0)
1069	{
1070	/* XXX */
1071	if ( soIgnorableErrorCode(errno)
1072	\|\| errno == ENOTCONN)
1073	{
1074	CONTINUE(tcp); /* Still connecting, continue */
1075	}
1076
1077	/* else failed */
1078	so->so_state = SS_NOFDREF;
1079
1080	/* tcp_input will take care of it */
1081	}
1082	else
1083	{
1084	ret = send(so->s, &ret, 0, 0);
1085	if (ret < 0)
1086	{
1087	/* XXX */
1088	if ( soIgnorableErrorCode(errno)
1089	\|\| errno == ENOTCONN)
1090	{
1091	CONTINUE(tcp);
1092	}
1093	/* else failed */
1094	so->so_state = SS_NOFDREF;
1095	}
1096	else
1097	so->so_state &= ~SS_ISFCONNECTING;
1098
1099	}
1100	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1101	} /* SS_ISFCONNECTING */
1102	#endif
1103	if (!slirpVerifyAndFreeSocket(pData, so))
1104	so->fUnderPolling = 0;
1105	LOOP_LABEL(tcp, so, so_next);
1106	}
1107
1108	/*
1109	* Now UDP sockets.
1110	* Incoming packets are sent straight away, they're not buffered.
1111	* Incoming UDP data isn't buffered either.
1112	*/
1113	QSOCKET_FOREACH(so, so_next, udp)
1114	/* { */
1115	#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1116	if (so->so_cloneOf)
1117	CONTINUE_NO_UNLOCK(udp);
1118	#endif
1119	#if 0
1120	so->fUnderPolling = 1;
1121	if(slirpVerifyAndFreeSocket(pData, so));
1122	CONTINUE(udp);
1123	so->fUnderPolling = 0;
1124	#endif
1125
1126	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1127
1128	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1129
1130	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1131	{
1132	SORECVFROM(pData, so);
1133	}
1134	LOOP_LABEL(udp, so, so_next);
1135	}
1136
1137	done:
1138
1139	STAM_PROFILE_STOP(&pData->StatPoll, a);
1140	}
1141
1142
1143	struct arphdr
1144	{
1145	unsigned short ar_hrd; /* format of hardware address */
1146	unsigned short ar_pro; /* format of protocol address */
1147	unsigned char ar_hln; /* length of hardware address */
1148	unsigned char ar_pln; /* length of protocol address */
1149	unsigned short ar_op; /* ARP opcode (command) */
1150
1151	/*
1152	* Ethernet looks like this : This bit is variable sized however...
1153	*/
1154	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1155	unsigned char ar_sip[4]; /* sender IP address */
1156	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1157	unsigned char ar_tip[4]; /* target IP address */
1158	};
1159	AssertCompileSize(struct arphdr, 28);
1160
1161	static void arp_output(PNATState pData, const uint8_t pcu8EtherSource, const struct arphdr pcARPHeaderSource, uint32_t ip4TargetAddress)
1162	{
1163	struct ethhdr *pEtherHeaderResponse;
1164	struct arphdr *pARPHeaderResponse;
1165	uint32_t ip4TargetAddressInHostFormat;
1166	struct mbuf *pMbufResponse;
1167
1168	Assert((pcu8EtherSource));
1169	if (!pcu8EtherSource)
1170	return;
1171	ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1172
1173	pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1174	if (!pMbufResponse)
1175	return;
1176	pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1177	/* @note: if_encap will swap src and dst*/
1178	memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1179	pMbufResponse->m_data += ETH_HLEN;
1180	pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1181	pMbufResponse->m_len = sizeof(struct arphdr);
1182
1183	pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1184	pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1185	pARPHeaderResponse->ar_hln = ETH_ALEN;
1186	pARPHeaderResponse->ar_pln = 4;
1187	pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1188	memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1189
1190	if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1191	{
1192	static bool fTagErrorReported;
1193	if (!fTagErrorReported)
1194	{
1195	LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
1196	(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1197	fTagErrorReported = true;
1198	}
1199	}
1200	pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1201
1202	memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1203	memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1204	memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1205	if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1206	}
1207	/**
1208	* @note This function will free m!
1209	*/
1210	static void arp_input(PNATState pData, struct mbuf *m)
1211	{
1212	struct ethhdr *pEtherHeader;
1213	struct arphdr *pARPHeader;
1214	uint32_t ip4TargetAddress;
1215
1216	int ar_op;
1217	pEtherHeader = mtod(m, struct ethhdr *);
1218	pARPHeader = (struct arphdr *)&pEtherHeader[1];
1219
1220	ar_op = RT_N2H_U16(pARPHeader->ar_op);
1221	ip4TargetAddress = (uint32_t)pARPHeader->ar_tip;
1222
1223	switch (ar_op)
1224	{
1225	case ARPOP_REQUEST:
1226	if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1227	\|\| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1228	\|\| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1229	arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1230
1231	/* Gratuitous ARP */
1232	if ( (uint32_t )pARPHeader->ar_sip == (uint32_t )pARPHeader->ar_tip
1233	&& memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1234	&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1235	{
1236	/* We've received an announce about address assignment,
1237	* let's do an ARP cache update
1238	*/
1239	static bool fGratuitousArpReported;
1240	if (!fGratuitousArpReported)
1241	{
1242	LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
1243	pARPHeader->ar_sip, pARPHeader->ar_sha));
1244	fGratuitousArpReported = true;
1245	}
1246	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1247	}
1248	break;
1249
1250	case ARPOP_REPLY:
1251	slirp_arp_cache_update_or_add(pData, (uint32_t )pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1252	break;
1253
1254	default:
1255	break;
1256	}
1257
1258	m_freem(pData, m);
1259	}
1260
1261	/**
1262	* Feed a packet into the slirp engine.
1263	*
1264	* @param m Data buffer, m_len is not valid.
1265	* @param cbBuf The length of the data in m.
1266	*/
1267	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1268	{
1269	int proto;
1270	static bool fWarnedIpv6;
1271	struct ethhdr *eh;
1272	uint8_t au8Ether[ETH_ALEN];
1273
1274	m->m_len = cbBuf;
1275	if (cbBuf < ETH_HLEN)
1276	{
1277	Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1278	m_freem(pData, m);
1279	return;
1280	}
1281	eh = mtod(m, struct ethhdr *);
1282	proto = RT_N2H_U16(eh->h_proto);
1283
1284	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1285
1286	switch(proto)
1287	{
1288	case ETH_P_ARP:
1289	arp_input(pData, m);
1290	break;
1291
1292	case ETH_P_IP:
1293	/* Update time. Important if the network is very quiet, as otherwise
1294	* the first outgoing connection gets an incorrect timestamp. */
1295	updtime(pData);
1296	m_adj(m, ETH_HLEN);
1297	M_ASSERTPKTHDR(m);
1298	m->m_pkthdr.header = mtod(m, void *);
1299	ip_input(pData, m);
1300	break;
1301
1302	case ETH_P_IPV6:
1303	m_freem(pData, m);
1304	if (!fWarnedIpv6)
1305	{
1306	LogRel(("NAT: IPv6 not supported\n"));
1307	fWarnedIpv6 = true;
1308	}
1309	break;
1310
1311	default:
1312	Log(("NAT: Unsupported protocol %x\n", proto));
1313	m_freem(pData, m);
1314	break;
1315	}
1316
1317	if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1318	activate_port_forwarding(pData, au8Ether);
1319	}
1320
1321	/**
1322	* Output the IP packet to the ethernet device.
1323	*
1324	* @note This function will free m!
1325	*/
1326	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1327	{
1328	struct ethhdr *eh;
1329	uint8_t *mbuf = NULL;
1330	size_t mlen = 0;
1331	STAM_PROFILE_START(&pData->StatIF_encap, a);
1332	LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1333	pData, eth_proto, m, flags));
1334
1335	M_ASSERTPKTHDR(m);
1336	m->m_data -= ETH_HLEN;
1337	m->m_len += ETH_HLEN;
1338	eh = mtod(m, struct ethhdr *);
1339	mlen = m->m_len;
1340
1341	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1342	{
1343	struct m_tag *t = m_tag_first(m);
1344	uint8_t u8ServiceId = CTL_ALIAS;
1345	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1346	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1347	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1348	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1349	{
1350	/* don't do anything */
1351	m_freem(pData, m);
1352	goto done;
1353	}
1354	if ( t
1355	&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1356	{
1357	Assert(t);
1358	u8ServiceId = (uint8_t )&t[1];
1359	}
1360	eh->h_source[5] = u8ServiceId;
1361	}
1362	/*
1363	* we're processing the chain, that isn't not expected.
1364	*/
1365	Assert((!m->m_next));
1366	if (m->m_next)
1367	{
1368	Log(("NAT: if_encap's recived the chain, dropping...\n"));
1369	m_freem(pData, m);
1370	goto done;
1371	}
1372	mbuf = mtod(m, uint8_t *);
1373	eh->h_proto = RT_H2N_U16(eth_proto);
1374	LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1375	if (flags & ETH_ENCAP_URG)
1376	slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1377	else
1378	slirp_output(pData->pvUser, m, mbuf, mlen);
1379	done:
1380	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1381	LogFlowFuncLeave();
1382	}
1383
1384	/**
1385	* Still we're using dhcp server leasing to map ether to IP
1386	* @todo see rt_lookup_in_cache
1387	*/
1388	static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1389	{
1390	uint32_t ip = INADDR_ANY;
1391	int rc;
1392
1393	if (eth_addr == NULL)
1394	return INADDR_ANY;
1395
1396	if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1397	\|\| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1398	return INADDR_ANY;
1399
1400	rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1401	if (RT_SUCCESS(rc))
1402	return ip;
1403
1404	bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1405	/* ignore return code, ip will be set to INADDR_ANY on error */
1406	return ip;
1407	}
1408
1409	/**
1410	* We need check if we've activated port forwarding
1411	* for specific machine ... that of course relates to
1412	* service mode
1413	* @todo finish this for service case
1414	*/
1415	static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1416	{
1417	struct port_forward_rule rule, tmp;
1418	const uint8_t *pu8EthSource = h_source;
1419
1420	/* check mac here */
1421	LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1422	{
1423	struct socket *so;
1424	struct alias_link *alias_link;
1425	struct libalias *lib;
1426	int flags;
1427	struct sockaddr sa;
1428	struct sockaddr_in *psin;
1429	socklen_t socketlen;
1430	struct in_addr alias;
1431	int rc;
1432	uint32_t guest_addr; /* need to understand if we already give address to guest */
1433
1434	if (rule->activated)
1435	continue;
1436
1437	#ifdef VBOX_WITH_NAT_SERVICE
1438	/**
1439	* case when guest ip is INADDR_ANY shouldn't appear in NAT service
1440	*/
1441	Assert((rule->guest_addr.s_addr != INADDR_ANY));
1442	guest_addr = rule->guest_addr.s_addr;
1443	#else /* VBOX_WITH_NAT_SERVICE */
1444	guest_addr = find_guest_ip(pData, pu8EthSource);
1445	#endif /* !VBOX_WITH_NAT_SERVICE */
1446	if (guest_addr == INADDR_ANY)
1447	{
1448	/* the address wasn't granted */
1449	return;
1450	}
1451
1452	#if !defined(VBOX_WITH_NAT_SERVICE)
1453	if ( rule->guest_addr.s_addr != guest_addr
1454	&& rule->guest_addr.s_addr != INADDR_ANY)
1455	continue;
1456	if (rule->guest_addr.s_addr == INADDR_ANY)
1457	rule->guest_addr.s_addr = guest_addr;
1458	#endif
1459
1460	LogRel(("NAT: set redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1461	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1462
1463	if (rule->proto == IPPROTO_UDP)
1464	so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1465	RT_H2N_U16(rule->guest_port), 0);
1466	else
1467	so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1468	RT_H2N_U16(rule->guest_port), 0);
1469
1470	if (so == NULL)
1471	goto remove_port_forwarding;
1472
1473	psin = (struct sockaddr_in *)&sa;
1474	psin->sin_family = AF_INET;
1475	psin->sin_port = 0;
1476	psin->sin_addr.s_addr = INADDR_ANY;
1477	socketlen = sizeof(struct sockaddr);
1478
1479	rc = getsockname(so->s, &sa, &socketlen);
1480	if (rc < 0 \|\| sa.sa_family != AF_INET)
1481	goto remove_port_forwarding;
1482
1483	psin = (struct sockaddr_in *)&sa;
1484
1485	lib = LibAliasInit(pData, NULL);
1486	flags = LibAliasSetMode(lib, 0, 0);
1487	flags \|= pData->i32AliasMode;
1488	flags \|= PKT_ALIAS_REVERSE; /* set reverse */
1489	flags = LibAliasSetMode(lib, flags, ~0);
1490
1491	alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) \| CTL_ALIAS);
1492	alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
1493	alias, RT_H2N_U16(rule->guest_port),
1494	pData->special_addr, -1, /* not very clear for now */
1495	rule->proto);
1496	if (!alias_link)
1497	goto remove_port_forwarding;
1498
1499	so->so_la = lib;
1500	rule->activated = 1;
1501	rule->so = so;
1502	pData->cRedirectionsActive++;
1503	continue;
1504
1505	remove_port_forwarding:
1506	LogRel(("NAT: failed to redirect %s %d => %d\n",
1507	(rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
1508	LIST_REMOVE(rule, list);
1509	pData->cRedirectionsStored--;
1510	RTMemFree(rule);
1511	}
1512	}
1513
1514	/**
1515	* Changes in 3.1 instead of opening new socket do the following:
1516	* gain more information:
1517	* 1. bind IP
1518	* 2. host port
1519	* 3. guest port
1520	* 4. proto
1521	* 5. guest MAC address
1522	* the guest's MAC address is rather important for service, but we easily
1523	* could get it from VM configuration in DrvNAT or Service, the idea is activating
1524	* corresponding port-forwarding
1525	*/
1526	int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1527	struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1528	{
1529	struct port_forward_rule *rule = NULL;
1530	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1531	{
1532	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1533	&& rule->host_port == host_port
1534	&& rule->bind_ip.s_addr == host_addr.s_addr
1535	&& rule->guest_port == guest_port
1536	&& rule->guest_addr.s_addr == guest_addr.s_addr
1537	)
1538	return 0; /* rule has been already registered */
1539	}
1540
1541	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1542	if (rule == NULL)
1543	return 1;
1544
1545	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1546	rule->host_port = host_port;
1547	rule->guest_port = guest_port;
1548	rule->guest_addr.s_addr = guest_addr.s_addr;
1549	rule->bind_ip.s_addr = host_addr.s_addr;
1550	if (ethaddr != NULL)
1551	memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1552	/* @todo add mac address */
1553	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1554	pData->cRedirectionsStored++;
1555	/* activate port-forwarding if guest has already got assigned IP */
1556	if ( ethaddr
1557	&& memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
1558	activate_port_forwarding(pData, ethaddr);
1559	return 0;
1560	}
1561
1562	int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1563	struct in_addr guest_addr, int guest_port)
1564	{
1565	struct port_forward_rule *rule = NULL;
1566	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1567	{
1568	if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1569	&& rule->host_port == host_port
1570	&& rule->guest_port == guest_port
1571	&& rule->bind_ip.s_addr == host_addr.s_addr
1572	&& rule->guest_addr.s_addr == guest_addr.s_addr
1573	&& rule->activated)
1574	{
1575	LogRel(("NAT: remove redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1576	rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1577
1578	LibAliasUninit(rule->so->so_la);
1579	if (is_udp)
1580	udp_detach(pData, rule->so);
1581	else
1582	tcp_close(pData, sototcpcb(rule->so));
1583	LIST_REMOVE(rule, list);
1584	RTMemFree(rule);
1585	pData->cRedirectionsStored--;
1586	break;
1587	}
1588
1589	}
1590	return 0;
1591	}
1592
1593	void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1594	{
1595	#ifndef VBOX_WITH_NAT_SERVICE
1596	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1597	#endif
1598	if (GuestIP != INADDR_ANY)
1599	{
1600	slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1601	activate_port_forwarding(pData, ethaddr);
1602	}
1603	}
1604
1605	#if defined(RT_OS_WINDOWS)
1606	HANDLE *slirp_get_events(PNATState pData)
1607	{
1608	return pData->phEvents;
1609	}
1610	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1611	{
1612	pData->phEvents[index] = hEvent;
1613	}
1614	#endif
1615
1616	unsigned int slirp_get_timeout_ms(PNATState pData)
1617	{
1618	if (link_up)
1619	{
1620	if (time_fasttimo)
1621	return 2;
1622	if (do_slowtimo)
1623	return 500; /* see PR_SLOWHZ */
1624	}
1625	return 36001000; / one hour */
1626	}
1627
1628	#ifndef RT_OS_WINDOWS
1629	int slirp_get_nsock(PNATState pData)
1630	{
1631	return pData->nsock;
1632	}
1633	#endif
1634
1635	/*
1636	* this function called from NAT thread
1637	*/
1638	void slirp_post_sent(PNATState pData, void *pvArg)
1639	{
1640	struct mbuf m = (struct mbuf )pvArg;
1641	m_freem(pData, m);
1642	}
1643
1644	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1645	{
1646	Log2(("tftp_prefix: %s\n", tftpPrefix));
1647	tftp_prefix = tftpPrefix;
1648	}
1649
1650	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1651	{
1652	Log2(("bootFile: %s\n", bootFile));
1653	bootp_filename = bootFile;
1654	}
1655
1656	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1657	{
1658	Log2(("next_server: %s\n", next_server));
1659	if (next_server == NULL)
1660	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1661	else
1662	inet_aton(next_server, &pData->tftp_server);
1663	}
1664
1665	int slirp_set_binding_address(PNATState pData, char *addr)
1666	{
1667	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1668	{
1669	pData->bindIP.s_addr = INADDR_ANY;
1670	return 1;
1671	}
1672	return 0;
1673	}
1674
1675	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1676	{
1677	if (!pData->fUseHostResolver)
1678	{
1679	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1680	pData->fUseDnsProxy = fDNSProxy;
1681	}
1682	else if (fDNSProxy)
1683	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1684	}
1685
1686	#define CHECK_ARG(name, val, lim_min, lim_max) \
1687	do { \
1688	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1689	{ \
1690	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1691	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1692	return; \
1693	} \
1694	else \
1695	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1696	} while (0)
1697
1698	void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1699	{
1700	LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
1701	/* Conditions */
1702	if (iSoMaxConn > SOMAXCONN)
1703	{
1704	LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1705	iSoMaxConn = SOMAXCONN;
1706	}
1707
1708	if (iSoMaxConn < 1)
1709	{
1710	LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1711	LogFlowFuncLeave();
1712	return;
1713	}
1714
1715	/* Asignment */
1716	if (pData->soMaxConn != iSoMaxConn)
1717	{
1718	LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1719	pData->soMaxConn, iSoMaxConn));
1720	pData->soMaxConn = iSoMaxConn;
1721	}
1722	LogFlowFuncLeave();
1723	}
1724	/* don't allow user set less 8kB and more than 1M values */
1725	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1726	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1727	{
1728	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1729	pData->socket_rcv = kilobytes;
1730	}
1731	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1732	{
1733	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1734	pData->socket_snd = kilobytes * _1K;
1735	}
1736	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1737	{
1738	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1739	tcp_rcvspace = kilobytes * _1K;
1740	}
1741	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1742	{
1743	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1744	tcp_sndspace = kilobytes * _1K;
1745	}
1746
1747	/*
1748	* Looking for Ether by ip in ARP-cache
1749	* Note: it´s responsible of caller to allocate buffer for result
1750	* @returns iprt status code
1751	*/
1752	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1753	{
1754	struct arp_cache_entry *ac;
1755
1756	if (ether == NULL)
1757	return VERR_INVALID_PARAMETER;
1758
1759	if (LIST_EMPTY(&pData->arp_cache))
1760	return VERR_NOT_FOUND;
1761
1762	LIST_FOREACH(ac, &pData->arp_cache, list)
1763	{
1764	if ( ac->ip == ip
1765	&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1766	{
1767	memcpy(ether, ac->ether, ETH_ALEN);
1768	return VINF_SUCCESS;
1769	}
1770	}
1771	return VERR_NOT_FOUND;
1772	}
1773
1774	/*
1775	* Looking for IP by Ether in ARP-cache
1776	* Note: it´s responsible of caller to allocate buffer for result
1777	* @returns 0 - if found, 1 - otherwise
1778	*/
1779	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1780	{
1781	struct arp_cache_entry *ac;
1782	*ip = INADDR_ANY;
1783
1784	if (LIST_EMPTY(&pData->arp_cache))
1785	return VERR_NOT_FOUND;
1786
1787	LIST_FOREACH(ac, &pData->arp_cache, list)
1788	{
1789	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1790	{
1791	*ip = ac->ip;
1792	return VINF_SUCCESS;
1793	}
1794	}
1795	return VERR_NOT_FOUND;
1796	}
1797
1798	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1799	{
1800	struct mbuf *m;
1801	struct ethhdr *ehdr;
1802	struct arphdr *ahdr;
1803	static bool fWarned = false;
1804	LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1805
1806	/* ARP request WHO HAS 0.0.0.0 is one of the signals
1807	* that something has been broken at Slirp. Investigating
1808	* pcap dumps it's easy to miss warning ARP requests being
1809	* focused on investigation of other protocols flow.
1810	*/
1811	#ifdef DEBUG_vvl
1812	Assert((dst != INADDR_ANY));
1813	NOREF(fWarned);
1814	#else
1815	if ( dst == INADDR_ANY
1816	&& !fWarned)
1817	{
1818	LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1819	fWarned = true;
1820	}
1821	#endif /* !DEBUG_vvl */
1822
1823	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1824	if (m == NULL)
1825	{
1826	Log(("NAT: Can't alloc mbuf for ARP request\n"));
1827	LogFlowFuncLeave();
1828	return;
1829	}
1830	ehdr = mtod(m, struct ethhdr *);
1831	memset(ehdr->h_source, 0xff, ETH_ALEN);
1832	ahdr = (struct arphdr *)&ehdr[1];
1833	ahdr->ar_hrd = RT_H2N_U16_C(1);
1834	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1835	ahdr->ar_hln = ETH_ALEN;
1836	ahdr->ar_pln = 4;
1837	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1838	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1839	/* we assume that this request come from gw, but not from DNS or TFTP */
1840	ahdr->ar_sha[5] = CTL_ALIAS;
1841	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1842	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1843	(uint32_t )ahdr->ar_tip = dst;
1844	/* warn!!! should falls in mbuf minimal size */
1845	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1846	m->m_data += ETH_HLEN;
1847	m->m_len -= ETH_HLEN;
1848	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1849	LogFlowFuncLeave();
1850	}
1851	#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1852	void slirp_add_host_resolver_mapping(PNATState pData, const char pszHostName, const char pszHostNamePattern, uint32_t u32HostIP)
1853	{
1854	LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1855	pszHostName ? pszHostName : "(null)",
1856	pszHostNamePattern ? pszHostNamePattern : "(null)",
1857	u32HostIP));
1858	if ( ( pszHostName
1859	\|\| pszHostNamePattern)
1860	&& u32HostIP != INADDR_ANY
1861	&& u32HostIP != INADDR_BROADCAST)
1862	{
1863	PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1864	if (!pDnsMapping)
1865	{
1866	LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1867	LogFlowFuncLeave();
1868	return;
1869	}
1870	pDnsMapping->u32IpAddress = u32HostIP;
1871	if (pszHostName)
1872	pDnsMapping->pszCName = RTStrDup(pszHostName);
1873	else if (pszHostNamePattern)
1874	pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1875	if ( !pDnsMapping->pszCName
1876	&& !pDnsMapping->pszPattern)
1877	{
1878	LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1879	RTMemFree(pDnsMapping);
1880	LogFlowFuncLeave();
1881	return;
1882	}
1883	LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1884	LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
1885	pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1886	pDnsMapping->u32IpAddress));
1887	}
1888	LogFlowFuncLeave();
1889	}
1890	#endif
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 (!memcmp(ac->ether, mac, ETH_ALEN))
1905	{
1906	ac->ip = dst;
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, PCDBGFINFOHLP pHlp, const char *pszArgs)
1974	{
1975	struct socket so, so_next;
1976	struct arp_cache_entry *ac;
1977	struct port_forward_rule *rule;
1978	NOREF(pszArgs);
1979
1980	pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
1981	pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
1982	QSOCKET_FOREACH(so, so_next, tcp)
1983	/* { */
1984	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1985	}
1986
1987	pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
1988	QSOCKET_FOREACH(so, so_next, udp)
1989	/* { */
1990	pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
1991	}
1992
1993	pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
1994	LIST_FOREACH(ac, &pData->arp_cache, list)
1995	{
1996	pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
1997	}
1998
1999	pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2000	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2001	{
2002	pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2003	rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2004	rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2005	rule->activated ? ' ' : '*');
2006	}
2007	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 41977

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