slirp.c@ 30016

Last change on this file since 30016 was 30016, checked in by vboxsync, 14 years ago
NAT: clean up.
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 61.7 KB

Line
1	/* $Id: slirp.c 30016 2010-06-03 18:31:14Z vboxsync $ */
2	/** @file
3	* NAT - slirp glue.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 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/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	#else
57	# include <Winnls.h>
58	# define _WINSOCK2API_
59	# include <IPHlpApi.h>
60	#endif
61	#include <alias.h>
62
63	#ifndef RT_OS_WINDOWS
64
65	# define DO_ENGAGE_EVENT1(so, fdset, label) \
66	do { \
67	if ( so->so_poll_index != -1 \
68	&& so->s == polls[so->so_poll_index].fd) \
69	{ \
70	polls[so->so_poll_index].events \|= N_(fdset ## _poll); \
71	break; \
72	} \
73	AssertRelease(poll_index < (nfds)); \
74	AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
75	polls[poll_index].fd = (so)->s; \
76	(so)->so_poll_index = poll_index; \
77	polls[poll_index].events = N_(fdset ## _poll); \
78	polls[poll_index].revents = 0; \
79	poll_index++; \
80	} while (0)
81
82	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
83	do { \
84	if ( so->so_poll_index != -1 \
85	&& so->s == polls[so->so_poll_index].fd) \
86	{ \
87	polls[so->so_poll_index].events \|= \
88	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
89	break; \
90	} \
91	AssertRelease(poll_index < (nfds)); \
92	polls[poll_index].fd = (so)->s; \
93	(so)->so_poll_index = poll_index; \
94	polls[poll_index].events = \
95	N_(fdset1 ## _poll) \| N_(fdset2 ## _poll); \
96	poll_index++; \
97	} while (0)
98
99	# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
100
101	/*
102	* DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
103	* gcc warns about attempts to log POLLNVAL so construction in a last to lines
104	* used to catch POLLNVAL while logging and return false in case of error while
105	* normal usage.
106	*/
107	# define DO_CHECK_FD_SET(so, events, fdset) \
108	( ((so)->so_poll_index != -1) \
109	&& ((so)->so_poll_index <= ndfs) \
110	&& ((so)->s == polls[so->so_poll_index].fd) \
111	&& (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
112	&& ( N_(fdset ## _poll) == POLLNVAL \
113	\|\| !(polls[(so)->so_poll_index].revents & POLLNVAL)))
114
115	/* specific for Unix API */
116	# define DO_UNIX_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
117	/* specific for Windows Winsock API */
118	# define DO_WIN_CHECK_FD_SET(so, events, fdset) 0
119
120	# ifndef RT_OS_LINUX
121	# define readfds_poll (POLLRDNORM)
122	# define writefds_poll (POLLWRNORM)
123	# else
124	# define readfds_poll (POLLIN)
125	# define writefds_poll (POLLOUT)
126	# endif
127	# define xfds_poll (POLLPRI)
128	# define closefds_poll (POLLHUP)
129	# define rderr_poll (POLLERR)
130	# define rdhup_poll (POLLHUP)
131	# define nval_poll (POLLNVAL)
132
133	# define ICMP_ENGAGE_EVENT(so, fdset) \
134	do { \
135	if (pData->icmp_socket.s != -1) \
136	DO_ENGAGE_EVENT1((so), fdset, ICMP); \
137	} while (0)
138
139	#else /* RT_OS_WINDOWS */
140
141	/*
142	* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
143	* So no call to WSAEventSelect necessary.
144	*/
145	# define ICMP_ENGAGE_EVENT(so, fdset) do {} while (0)
146
147	/*
148	* On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
149	*/
150	# define DO_ENGAGE_EVENT1(so, fdset1, label) \
151	do { \
152	rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
153	if (rc == SOCKET_ERROR) \
154	{ \
155	/* This should not happen */ \
156	error = WSAGetLastError(); \
157	LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
158	error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
159	} \
160	} while (0); \
161	CONTINUE(label)
162
163	# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
164	DO_ENGAGE_EVENT1((so), (fdset1), label)
165
166	# define DO_POLL_EVENTS(rc, error, so, events, label) \
167	(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
168	if ((rc) == SOCKET_ERROR) \
169	{ \
170	(error) = WSAGetLastError(); \
171	LogRel(("WSAEnumNetworkEvents " #label " error %d\n", (error))); \
172	CONTINUE(label); \
173	}
174
175	# define acceptds_win FD_ACCEPT
176	# define acceptds_win_bit FD_ACCEPT_BIT
177	# define readfds_win FD_READ
178	# define readfds_win_bit FD_READ_BIT
179	# define writefds_win FD_WRITE
180	# define writefds_win_bit FD_WRITE_BIT
181	# define xfds_win FD_OOB
182	# define xfds_win_bit FD_OOB_BIT
183	# define closefds_win FD_CLOSE
184	# define closefds_win_bit FD_CLOSE_BIT
185
186	# define closefds_win FD_CLOSE
187	# define closefds_win_bit FD_CLOSE_BIT
188
189	# define DO_CHECK_FD_SET(so, events, fdset) \
190	(((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
191
192	# define DO_WIN_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
193	# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /specific for Unix API /
194
195	#endif /* RT_OS_WINDOWS */
196
197	#define TCP_ENGAGE_EVENT1(so, fdset) \
198	DO_ENGAGE_EVENT1((so), fdset, tcp)
199
200	#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
201	DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
202
203	#define UDP_ENGAGE_EVENT(so, fdset) \
204	DO_ENGAGE_EVENT1((so), fdset, udp)
205
206	#define POLL_TCP_EVENTS(rc, error, so, events) \
207	DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
208
209	#define POLL_UDP_EVENTS(rc, error, so, events) \
210	DO_POLL_EVENTS((rc), (error), (so), (events), udp)
211
212	#define CHECK_FD_SET(so, events, set) \
213	(DO_CHECK_FD_SET((so), (events), set))
214
215	#define WIN_CHECK_FD_SET(so, events, set) \
216	(DO_WIN_CHECK_FD_SET((so), (events), set))
217
218	#define UNIX_CHECK_FD_SET(so, events, set) \
219	(DO_UNIX_CHECK_FD_SET(so, events, set))
220
221	/*
222	* Loging macros
223	*/
224	#if VBOX_WITH_DEBUG_NAT_SOCKETS
225	# if defined(RT_OS_WINDOWS)
226	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
227	do { \
228	LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
229	} while (0)
230	# else /* !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] %s %s %s er: %s, %s, %s\n", (so), \
234	CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
235	CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
236	CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
237	CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
238	CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
239	CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
240	} while (0)
241	# endif /* !RT_OS_WINDOWS */
242	#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
243	# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
244	#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
245
246	#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
247	DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
248
249	static void activate_port_forwarding(PNATState, const uint8_t *pEther);
250
251	static const uint8_t special_ethaddr[6] =
252	{
253	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
254	};
255
256	static const uint8_t broadcast_ethaddr[6] =
257	{
258	0xff, 0xff, 0xff, 0xff, 0xff, 0xff
259	};
260
261	const uint8_t zerro_ethaddr[6] =
262	{
263	0x0, 0x0, 0x0, 0x0, 0x0, 0x0
264	};
265
266	#ifdef RT_OS_WINDOWS
267	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
268	struct in_addr *pdns_addr,
269	const char **ppszDomain)
270	{
271	ULONG flags = GAA_FLAG_INCLUDE_PREFIX; /GAA_FLAG_INCLUDE_ALL_INTERFACES;/ /* all interfaces registered in NDIS */
272	PIP_ADAPTER_ADDRESSES pAdapterAddr = NULL;
273	PIP_ADAPTER_ADDRESSES pAddr = NULL;
274	PIP_ADAPTER_DNS_SERVER_ADDRESS pDnsAddr = NULL;
275	ULONG size;
276	int wlen = 0;
277	char *pszSuffix;
278	struct dns_domain_entry *pDomain = NULL;
279	ULONG ret = ERROR_SUCCESS;
280
281	/* @todo add SKIPing flags to get only required information */
282
283	/* determine size of buffer */
284	size = 0;
285	ret = pData->pfGetAdaptersAddresses(AF_INET, 0, NULL /* reserved */, pAdapterAddr, &size);
286	if (ret != ERROR_BUFFER_OVERFLOW)
287	{
288	LogRel(("NAT: error %lu occurred on capacity detection operation\n", ret));
289	return -1;
290	}
291	if (size == 0)
292	{
293	LogRel(("NAT: Win socket API returns non capacity\n"));
294	return -1;
295	}
296
297	pAdapterAddr = RTMemAllocZ(size);
298	if (!pAdapterAddr)
299	{
300	LogRel(("NAT: No memory available \n"));
301	return -1;
302	}
303	ret = pData->pfGetAdaptersAddresses(AF_INET, 0, NULL /* reserved */, pAdapterAddr, &size);
304	if (ret != ERROR_SUCCESS)
305	{
306	LogRel(("NAT: error %lu occurred on fetching adapters info\n", ret));
307	RTMemFree(pAdapterAddr);
308	return -1;
309	}
310
311	for (pAddr = pAdapterAddr; pAddr != NULL; pAddr = pAddr->Next)
312	{
313	int found;
314	if (pAddr->OperStatus != IfOperStatusUp)
315	continue;
316
317	for (pDnsAddr = pAddr->FirstDnsServerAddress; pDnsAddr != NULL; pDnsAddr = pDnsAddr->Next)
318	{
319	struct sockaddr *SockAddr = pDnsAddr->Address.lpSockaddr;
320	struct in_addr InAddr;
321	struct dns_entry *pDns;
322
323	if (SockAddr->sa_family != AF_INET)
324	continue;
325
326	InAddr = ((struct sockaddr_in *)SockAddr)->sin_addr;
327
328	/* add dns server to list */
329	pDns = RTMemAllocZ(sizeof(struct dns_entry));
330	if (!pDns)
331	{
332	LogRel(("NAT: Can't allocate buffer for DNS entry\n"));
333	RTMemFree(pAdapterAddr);
334	return VERR_NO_MEMORY;
335	}
336
337	LogRel(("NAT: adding %R[IP4] to DNS server list\n", &InAddr));
338	if ((InAddr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET)) == RT_N2H_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
339	pDns->de_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
340	else
341	pDns->de_addr.s_addr = InAddr.s_addr;
342
343	TAILQ_INSERT_HEAD(&pData->pDnsList, pDns, de_list);
344
345	if (pAddr->DnsSuffix == NULL)
346	continue;
347
348	/* uniq */
349	RTUtf16ToUtf8(pAddr->DnsSuffix, &pszSuffix);
350	if (!pszSuffix \|\| strlen(pszSuffix) == 0)
351	{
352	RTStrFree(pszSuffix);
353	continue;
354	}
355
356	found = 0;
357	LIST_FOREACH(pDomain, &pData->pDomainList, dd_list)
358	{
359	if ( pDomain->dd_pszDomain != NULL
360	&& strcmp(pDomain->dd_pszDomain, pszSuffix) == 0)
361	{
362	found = 1;
363	RTStrFree(pszSuffix);
364	break;
365	}
366	}
367	if (!found)
368	{
369	pDomain = RTMemAllocZ(sizeof(struct dns_domain_entry));
370	if (!pDomain)
371	{
372	LogRel(("NAT: not enough memory\n"));
373	RTStrFree(pszSuffix);
374	RTMemFree(pAdapterAddr);
375	return VERR_NO_MEMORY;
376	}
377	pDomain->dd_pszDomain = pszSuffix;
378	LogRel(("NAT: adding domain name %s to search list\n", pDomain->dd_pszDomain));
379	LIST_INSERT_HEAD(&pData->pDomainList, pDomain, dd_list);
380	}
381	}
382	}
383	RTMemFree(pAdapterAddr);
384	return 0;
385	}
386
387	#else /* !RT_OS_WINDOWS */
388
389	static int RTFileGets(RTFILE File, void pvBuf, size_t cbBufSize, size_t pcbRead)
390	{
391	size_t cbRead;
392	char bTest;
393	int rc = VERR_NO_MEMORY;
394	char pu8Buf = (char )pvBuf;
395	*pcbRead = 0;
396
397	while ( RT_SUCCESS(rc = RTFileRead(File, &bTest, 1, &cbRead))
398	&& (pu8Buf - (char *)pvBuf) < cbBufSize)
399	{
400	if (cbRead == 0)
401	return VERR_EOF;
402
403	if (bTest == '\r' \|\| bTest == '\n')
404	{
405	*pu8Buf = 0;
406	return VINF_SUCCESS;
407	}
408	*pu8Buf = bTest;
409	pu8Buf++;
410	(*pcbRead)++;
411	}
412	return rc;
413	}
414
415	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
416	struct in_addr *pdns_addr,
417	const char **ppszDomain)
418	{
419	char buff[512];
420	char buff2[256];
421	RTFILE f;
422	int cNameserversFound = 0;
423	int fWarnTooManyDnsServers = 0;
424	struct in_addr tmp_addr;
425	int rc;
426	size_t bytes;
427
428	# ifdef RT_OS_OS2
429	/* Try various locations. */
430	char *etc = getenv("ETC");
431	if (etc)
432	{
433	RTStrmPrintf(buff, sizeof(buff), "%s/RESOLV2", etc);
434	rc = RTFileOpen(&f, buff, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
435	}
436	if (RT_FAILURE(rc))
437	{
438	RTStrmPrintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
439	rc = RTFileOpen(&f, buff, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
440	}
441	if (RT_FAILURE(rc))
442	{
443	RTStrmPrintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
444	rc = RTFileOpen(&f, buff, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
445	}
446	# else /* !RT_OS_OS2 */
447	# ifndef DEBUG_vvl
448	rc = RTFileOpen(&f, "/etc/resolv.conf", RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
449	# else
450	char *home = getenv("HOME");
451	RTStrPrintf(buff, sizeof(buff), "%s/resolv.conf", home);
452	rc = RTFileOpen(&f, buff, RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
453	if (RT_SUCCESS(rc))
454	{
455	Log(("NAT: DNS we're using %s\n", buff));
456	}
457	else
458	{
459	rc = RTFileOpen(&f, "/etc/resolv.conf", RTFILE_O_READ \| RTFILE_O_OPEN \| RTFILE_O_DENY_NONE);
460	Log(("NAT: DNS we're using %s\n", buff));
461	}
462	# endif
463	# endif /* !RT_OS_OS2 */
464	if (RT_FAILURE(rc))
465	return -1;
466
467	if (ppszDomain)
468	*ppszDomain = NULL;
469
470	Log(("NAT: DNS Servers:\n"));
471	while ( RT_SUCCESS(rc = RTFileGets(f, buff, sizeof(buff), &bytes))
472	&& rc != VERR_EOF)
473	{
474	struct dns_entry *pDns = NULL;
475	if ( cNameserversFound == 4
476	&& fWarnTooManyDnsServers == 0
477	&& sscanf(buff, "nameserver%*[ \t]%255s", buff2) == 1)
478	{
479	fWarnTooManyDnsServers = 1;
480	LogRel(("NAT: too many nameservers registered.\n"));
481	}
482	if ( sscanf(buff, "nameserver%*[ \t]%255s", buff2) == 1
483	&& cNameserversFound < 4) /* Unix doesn't accept more than 4 name servers*/
484	{
485	if (!inet_aton(buff2, &tmp_addr))
486	continue;
487
488	/* localhost mask */
489	pDns = RTMemAllocZ(sizeof (struct dns_entry));
490	if (!pDns)
491	{
492	LogRel(("can't alloc memory for DNS entry\n"));
493	return -1;
494	}
495
496	/* check */
497	pDns->de_addr.s_addr = tmp_addr.s_addr;
498	if ((pDns->de_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET)) == RT_N2H_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
499	{
500	pDns->de_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
501	}
502	TAILQ_INSERT_HEAD(&pData->pDnsList, pDns, de_list);
503	cNameserversFound++;
504	}
505	if ((!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6)))
506	{
507	char *tok;
508	char *saveptr;
509	struct dns_domain_entry *pDomain = NULL;
510	int fFoundDomain = 0;
511	tok = strtok_r(&buff[6], " \t\n", &saveptr);
512	LIST_FOREACH(pDomain, &pData->pDomainList, dd_list)
513	{
514	if ( tok != NULL
515	&& strcmp(tok, pDomain->dd_pszDomain) == 0)
516	{
517	fFoundDomain = 1;
518	break;
519	}
520	}
521	if (tok != NULL && !fFoundDomain)
522	{
523	pDomain = RTMemAllocZ(sizeof(struct dns_domain_entry));
524	if (!pDomain)
525	{
526	LogRel(("NAT: not enought memory to add domain list\n"));
527	return VERR_NO_MEMORY;
528	}
529	pDomain->dd_pszDomain = RTStrDup(tok);
530	LogRel(("NAT: adding domain name %s to search list\n", pDomain->dd_pszDomain));
531	LIST_INSERT_HEAD(&pData->pDomainList, pDomain, dd_list);
532	}
533	}
534	}
535	RTFileClose(f);
536	if (!cNameserversFound)
537	return -1;
538	return 0;
539	}
540
541	#endif /* !RT_OS_WINDOWS */
542
543	int slirp_init_dns_list(PNATState pData)
544	{
545	TAILQ_INIT(&pData->pDnsList);
546	LIST_INIT(&pData->pDomainList);
547	return get_dns_addr_domain(pData, true, NULL, NULL);
548	}
549
550	void slirp_release_dns_list(PNATState pData)
551	{
552	struct dns_entry *pDns = NULL;
553	struct dns_domain_entry *pDomain = NULL;
554
555	while (!TAILQ_EMPTY(&pData->pDnsList))
556	{
557	pDns = TAILQ_FIRST(&pData->pDnsList);
558	TAILQ_REMOVE(&pData->pDnsList, pDns, de_list);
559	RTMemFree(pDns);
560	}
561
562	while (!LIST_EMPTY(&pData->pDomainList))
563	{
564	pDomain = LIST_FIRST(&pData->pDomainList);
565	LIST_REMOVE(pDomain, dd_list);
566	if (pDomain->dd_pszDomain != NULL)
567	RTStrFree(pDomain->dd_pszDomain);
568	RTMemFree(pDomain);
569	}
570	}
571
572	int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
573	{
574	return get_dns_addr_domain(pData, false, pdns_addr, NULL);
575	}
576
577	int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
578	bool fPassDomain, bool fUseHostResolver, int i32AliasMode, void *pvUser)
579	{
580	int fNATfailed = 0;
581	int rc;
582	PNATState pData = RTMemAllocZ(sizeof(NATState));
583	*ppData = pData;
584	if (!pData)
585	return VERR_NO_MEMORY;
586	if (u32Netmask & 0x1f)
587	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
588	return VERR_INVALID_PARAMETER;
589	pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
590	pData->fUseHostResolver = fUseHostResolver;
591	pData->pvUser = pvUser;
592	pData->netmask = u32Netmask;
593
594	/* sockets & TCP defaults */
595	pData->socket_rcv = 64 * _1K;
596	pData->socket_snd = 64 * _1K;
597	tcp_sndspace = 64 * _1K;
598	tcp_rcvspace = 64 * _1K;
599
600	#ifdef RT_OS_WINDOWS
601	{
602	WSADATA Data;
603	WSAStartup(MAKEWORD(2, 0), &Data);
604	}
605	pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
606	#endif
607	#ifdef VBOX_WITH_SLIRP_MT
608	QSOCKET_LOCK_CREATE(tcb);
609	QSOCKET_LOCK_CREATE(udb);
610	rc = RTReqCreateQueue(&pData->pReqQueue);
611	AssertReleaseRC(rc);
612	#endif
613
614	link_up = 1;
615
616	rc = bootp_dhcp_init(pData);
617	if (rc != 0)
618	{
619	LogRel(("NAT: DHCP server initialization was failed\n"));
620	return VINF_NAT_DNS;
621	}
622	debug_init();
623	if_init(pData);
624	ip_init(pData);
625	icmp_init(pData);
626
627	/* Initialise mbufs after setting the MTU */
628	mbuf_init(pData);
629
630	pData->special_addr.s_addr = u32NetAddr;
631	pData->slirp_ethaddr = &special_ethaddr[0];
632	alias_addr.s_addr = pData->special_addr.s_addr \| RT_H2N_U32_C(CTL_ALIAS);
633	/* @todo: add ability to configure this staff */
634
635	/* set default addresses */
636	inet_aton("127.0.0.1", &loopback_addr);
637	if (!pData->fUseHostResolver)
638	{
639	if (slirp_init_dns_list(pData) < 0)
640	fNATfailed = 1;
641
642	dnsproxy_init(pData);
643	}
644	if (i32AliasMode & ~(PKT_ALIAS_LOG\|PKT_ALIAS_SAME_PORTS\|PKT_ALIAS_PROXY_ONLY))
645	{
646	LogRel(("NAT: alias mode %x is ignored\n", i32AliasMode));
647	i32AliasMode = 0;
648	}
649	pData->i32AliasMode = i32AliasMode;
650	getouraddr(pData);
651	{
652	int flags = 0;
653	struct in_addr proxy_addr;
654	pData->proxy_alias = LibAliasInit(pData, NULL);
655	if (pData->proxy_alias == NULL)
656	{
657	LogRel(("NAT: LibAlias default rule wasn't initialized\n"));
658	AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
659	}
660	flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
661	#ifndef NO_FW_PUNCH
662	flags \|= PKT_ALIAS_PUNCH_FW;
663	#endif
664	flags \|= pData->i32AliasMode; /* do transparent proxying */
665	flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
666	proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
667	LibAliasSetAddress(pData->proxy_alias, proxy_addr);
668	ftp_alias_load(pData);
669	nbt_alias_load(pData);
670	if (pData->fUseHostResolver)
671	dns_alias_load(pData);
672	}
673	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
674	}
675
676	/**
677	* Register statistics.
678	*/
679	void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
680	{
681	#ifdef VBOX_WITH_STATISTICS
682	# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
683	# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
684	# include "counters.h"
685	# undef COUNTER
686	/** @todo register statistics for the variables dumped by:
687	* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
688	* mbufstats(pData); sockstats(pData); */
689	#endif /* VBOX_WITH_STATISTICS */
690	}
691
692	/**
693	* Deregister statistics.
694	*/
695	void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
696	{
697	if (pData == NULL)
698	return;
699	#ifdef VBOX_WITH_STATISTICS
700	# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
701	# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
702	# include "counters.h"
703	#endif /* VBOX_WITH_STATISTICS */
704	}
705
706	/**
707	* Marks the link as up, making it possible to establish new connections.
708	*/
709	void slirp_link_up(PNATState pData)
710	{
711	struct arp_cache_entry *ac;
712	link_up = 1;
713
714	if (LIST_EMPTY(&pData->arp_cache))
715	return;
716
717	LIST_FOREACH(ac, &pData->arp_cache, list)
718	{
719	activate_port_forwarding(pData, ac->ether);
720	}
721	}
722
723	/**
724	* Marks the link as down and cleans up the current connections.
725	*/
726	void slirp_link_down(PNATState pData)
727	{
728	struct socket *so;
729	struct port_forward_rule *rule;
730
731	while ((so = tcb.so_next) != &tcb)
732	{
733	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
734	sofree(pData, so);
735	else
736	tcp_drop(pData, sototcpcb(so), 0);
737	}
738
739	while ((so = udb.so_next) != &udb)
740	udp_detach(pData, so);
741
742	/*
743	* Clear the active state of port-forwarding rules to force
744	* re-setup on restoration of communications.
745	*/
746	LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
747	{
748	rule->activated = 0;
749	}
750	pData->cRedirectionsActive = 0;
751
752	link_up = 0;
753	}
754
755	/**
756	* Terminates the slirp component.
757	*/
758	void slirp_term(PNATState pData)
759	{
760	if (pData == NULL)
761	return;
762	#ifdef RT_OS_WINDOWS
763	pData->pfIcmpCloseHandle(pData->icmp_socket.sh);
764	FreeLibrary(pData->hmIcmpLibrary);
765	RTMemFree(pData->pvIcmpBuffer);
766	#else
767	closesocket(pData->icmp_socket.s);
768	#endif
769
770	slirp_link_down(pData);
771	slirp_release_dns_list(pData);
772	ftp_alias_unload(pData);
773	nbt_alias_unload(pData);
774	if (pData->fUseHostResolver)
775	dns_alias_unload(pData);
776	while (!LIST_EMPTY(&instancehead))
777	{
778	struct libalias *la = LIST_FIRST(&instancehead);
779	/* libalias do all clean up */
780	LibAliasUninit(la);
781	}
782	while (!LIST_EMPTY(&pData->arp_cache))
783	{
784	struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
785	LIST_REMOVE(ac, list);
786	RTMemFree(ac);
787	}
788	bootp_dhcp_fini(pData);
789	m_fini(pData);
790	#ifdef RT_OS_WINDOWS
791	WSACleanup();
792	#endif
793	#ifdef LOG_ENABLED
794	Log(("\n"
795	"NAT statistics\n"
796	"--------------\n"
797	"\n"));
798	ipstats(pData);
799	tcpstats(pData);
800	udpstats(pData);
801	icmpstats(pData);
802	mbufstats(pData);
803	sockstats(pData);
804	Log(("\n"
805	"\n"
806	"\n"));
807	#endif
808	RTMemFree(pData);
809	}
810
811
812	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
813	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
814
815	/*
816	* curtime kept to an accuracy of 1ms
817	*/
818	static void updtime(PNATState pData)
819	{
820	#ifdef RT_OS_WINDOWS
821	struct _timeb tb;
822
823	_ftime(&tb);
824	curtime = (u_int)tb.time * (u_int)1000;
825	curtime += (u_int)tb.millitm;
826	#else
827	gettimeofday(&tt, 0);
828
829	curtime = (u_int)tt.tv_sec * (u_int)1000;
830	curtime += (u_int)tt.tv_usec / (u_int)1000;
831
832	if ((tt.tv_usec % 1000) >= 500)
833	curtime++;
834	#endif
835	}
836
837	#ifdef RT_OS_WINDOWS
838	void slirp_select_fill(PNATState pData, int *pnfds)
839	#else /* RT_OS_WINDOWS */
840	void slirp_select_fill(PNATState pData, int pnfds, struct pollfd polls)
841	#endif /* !RT_OS_WINDOWS */
842	{
843	struct socket so, so_next;
844	int nfds;
845	#if defined(RT_OS_WINDOWS)
846	int rc;
847	int error;
848	#else
849	int poll_index = 0;
850	#endif
851	int i;
852
853	STAM_PROFILE_START(&pData->StatFill, a);
854
855	nfds = *pnfds;
856
857	/*
858	* First, TCP sockets
859	*/
860	do_slowtimo = 0;
861	if (!link_up)
862	goto done;
863
864	/*
865	* *_slowtimo needs calling if there are IP fragments
866	* in the fragment queue, or there are TCP connections active
867	*/
868	/* XXX:
869	* triggering of fragment expiration should be the same but use new macroses
870	*/
871	do_slowtimo = (tcb.so_next != &tcb);
872	if (!do_slowtimo)
873	{
874	for (i = 0; i < IPREASS_NHASH; i++)
875	{
876	if (!TAILQ_EMPTY(&ipq[i]))
877	{
878	do_slowtimo = 1;
879	break;
880	}
881	}
882	}
883	/* always add the ICMP socket */
884	#ifndef RT_OS_WINDOWS
885	pData->icmp_socket.so_poll_index = -1;
886	#endif
887	ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
888
889	STAM_COUNTER_RESET(&pData->StatTCP);
890	STAM_COUNTER_RESET(&pData->StatTCPHot);
891
892	QSOCKET_FOREACH(so, so_next, tcp)
893	/* { */
894	#if !defined(RT_OS_WINDOWS)
895	so->so_poll_index = -1;
896	#endif
897	STAM_COUNTER_INC(&pData->StatTCP);
898
899	/*
900	* See if we need a tcp_fasttimo
901	*/
902	if ( time_fasttimo == 0
903	&& so->so_tcpcb != NULL
904	&& so->so_tcpcb->t_flags & TF_DELACK)
905	{
906	time_fasttimo = curtime; /* Flag when we want a fasttimo */
907	}
908
909	/*
910	* NOFDREF can include still connecting to local-host,
911	* newly socreated() sockets etc. Don't want to select these.
912	*/
913	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
914	CONTINUE(tcp);
915
916	/*
917	* Set for reading sockets which are accepting
918	*/
919	if (so->so_state & SS_FACCEPTCONN)
920	{
921	STAM_COUNTER_INC(&pData->StatTCPHot);
922	TCP_ENGAGE_EVENT1(so, readfds);
923	CONTINUE(tcp);
924	}
925
926	/*
927	* Set for writing sockets which are connecting
928	*/
929	if (so->so_state & SS_ISFCONNECTING)
930	{
931	Log2(("connecting %R[natsock] engaged\n",so));
932	STAM_COUNTER_INC(&pData->StatTCPHot);
933	TCP_ENGAGE_EVENT1(so, writefds);
934	}
935
936	/*
937	* Set for writing if we are connected, can send more, and
938	* we have something to send
939	*/
940	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc)
941	{
942	STAM_COUNTER_INC(&pData->StatTCPHot);
943	TCP_ENGAGE_EVENT1(so, writefds);
944	}
945
946	/*
947	* Set for reading (and urgent data) if we are connected, can
948	* receive more, and we have room for it XXX /2 ?
949	*/
950	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2)))
951	{
952	STAM_COUNTER_INC(&pData->StatTCPHot);
953	TCP_ENGAGE_EVENT2(so, readfds, xfds);
954	}
955	LOOP_LABEL(tcp, so, so_next);
956	}
957
958	/*
959	* UDP sockets
960	*/
961	STAM_COUNTER_RESET(&pData->StatUDP);
962	STAM_COUNTER_RESET(&pData->StatUDPHot);
963
964	QSOCKET_FOREACH(so, so_next, udp)
965	/* { */
966
967	STAM_COUNTER_INC(&pData->StatUDP);
968	#if !defined(RT_OS_WINDOWS)
969	so->so_poll_index = -1;
970	#endif
971
972	/*
973	* See if it's timed out
974	*/
975	if (so->so_expire)
976	{
977	if (so->so_expire <= curtime)
978	{
979	Log2(("NAT: %R[natsock] expired\n", so));
980	if (so->so_timeout != NULL)
981	{
982	so->so_timeout(pData, so, so->so_timeout_arg);
983	}
984	#ifdef VBOX_WITH_SLIRP_MT
985	/* we need so_next for continue our cycle*/
986	so_next = so->so_next;
987	#endif
988	UDP_DETACH(pData, so, so_next);
989	CONTINUE_NO_UNLOCK(udp);
990	}
991	else
992	{
993	do_slowtimo = 1; /* Let socket expire */
994	}
995	}
996
997	/*
998	* When UDP packets are received from over the link, they're
999	* sendto()'d straight away, so no need for setting for writing
1000	* Limit the number of packets queued by this session to 4.
1001	* Note that even though we try and limit this to 4 packets,
1002	* the session could have more queued if the packets needed
1003	* to be fragmented.
1004	*
1005	* (XXX <= 4 ?)
1006	*/
1007	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
1008	{
1009	STAM_COUNTER_INC(&pData->StatUDPHot);
1010	UDP_ENGAGE_EVENT(so, readfds);
1011	}
1012	LOOP_LABEL(udp, so, so_next);
1013	}
1014	done:
1015
1016	#if defined(RT_OS_WINDOWS)
1017	*pnfds = VBOX_EVENT_COUNT;
1018	#else /* RT_OS_WINDOWS */
1019	AssertRelease(poll_index <= *pnfds);
1020	*pnfds = poll_index;
1021	#endif /* !RT_OS_WINDOWS */
1022
1023	STAM_PROFILE_STOP(&pData->StatFill, a);
1024	}
1025
1026	#if defined(RT_OS_WINDOWS)
1027	void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
1028	#else /* RT_OS_WINDOWS */
1029	void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
1030	#endif /* !RT_OS_WINDOWS */
1031	{
1032	struct socket so, so_next;
1033	int ret;
1034	#if defined(RT_OS_WINDOWS)
1035	WSANETWORKEVENTS NetworkEvents;
1036	int rc;
1037	int error;
1038	#else
1039	int poll_index = 0;
1040	#endif
1041
1042	STAM_PROFILE_START(&pData->StatPoll, a);
1043
1044	/* Update time */
1045	updtime(pData);
1046
1047	/*
1048	* See if anything has timed out
1049	*/
1050	if (link_up)
1051	{
1052	if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
1053	{
1054	STAM_PROFILE_START(&pData->StatFastTimer, b);
1055	tcp_fasttimo(pData);
1056	time_fasttimo = 0;
1057	STAM_PROFILE_STOP(&pData->StatFastTimer, b);
1058	}
1059	if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
1060	{
1061	STAM_PROFILE_START(&pData->StatSlowTimer, c);
1062	ip_slowtimo(pData);
1063	tcp_slowtimo(pData);
1064	last_slowtimo = curtime;
1065	STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
1066	}
1067	}
1068	#if defined(RT_OS_WINDOWS)
1069	if (fTimeout)
1070	return; /* only timer update */
1071	#endif
1072
1073	/*
1074	* Check sockets
1075	*/
1076	if (!link_up)
1077	goto done;
1078	#if defined(RT_OS_WINDOWS)
1079	/*XXX: before renaming please make see define
1080	* fIcmp in slirp_state.h
1081	*/
1082	if (fIcmp)
1083	sorecvfrom(pData, &pData->icmp_socket);
1084	#else
1085	if ( (pData->icmp_socket.s != -1)
1086	&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
1087	sorecvfrom(pData, &pData->icmp_socket);
1088	#endif
1089	/*
1090	* Check TCP sockets
1091	*/
1092	QSOCKET_FOREACH(so, so_next, tcp)
1093	/* { */
1094
1095	#ifdef VBOX_WITH_SLIRP_MT
1096	if ( so->so_state & SS_NOFDREF
1097	&& so->so_deleted == 1)
1098	{
1099	struct socket son, sop = NULL;
1100	QSOCKET_LOCK(tcb);
1101	if (so->so_next != NULL)
1102	{
1103	if (so->so_next != &tcb)
1104	SOCKET_LOCK(so->so_next);
1105	son = so->so_next;
1106	}
1107	if ( so->so_prev != &tcb
1108	&& so->so_prev != NULL)
1109	{
1110	SOCKET_LOCK(so->so_prev);
1111	sop = so->so_prev;
1112	}
1113	QSOCKET_UNLOCK(tcb);
1114	remque(pData, so);
1115	NSOCK_DEC();
1116	SOCKET_UNLOCK(so);
1117	SOCKET_LOCK_DESTROY(so);
1118	RTMemFree(so);
1119	so_next = son;
1120	if (sop != NULL)
1121	SOCKET_UNLOCK(sop);
1122	CONTINUE_NO_UNLOCK(tcp);
1123	}
1124	#endif
1125	/*
1126	* FD_ISSET is meaningless on these sockets
1127	* (and they can crash the program)
1128	*/
1129	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
1130	CONTINUE(tcp);
1131
1132	POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
1133
1134	LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
1135
1136
1137	/*
1138	* Check for URG data
1139	* This will soread as well, so no need to
1140	* test for readfds below if this succeeds
1141	*/
1142
1143	/* out-of-band data */
1144	if ( CHECK_FD_SET(so, NetworkEvents, xfds)
1145	#ifdef RT_OS_DARWIN
1146	/* Darwin and probably BSD hosts generates POLLPRI\|POLLHUP event on receiving TCP.flags.{ACK\|URG\|FIN} this
1147	* combination on other Unixs hosts doesn't enter to this branch
1148	*/
1149	&& !CHECK_FD_SET(so, NetworkEvents, closefds)
1150	#endif
1151	)
1152	{
1153	sorecvoob(pData, so);
1154	}
1155
1156	/*
1157	* Check sockets for reading
1158	*/
1159	else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
1160	\|\| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
1161	{
1162	/*
1163	* Check for incoming connections
1164	*/
1165	if (so->so_state & SS_FACCEPTCONN)
1166	{
1167	TCP_CONNECT(pData, so);
1168	if (!CHECK_FD_SET(so, NetworkEvents, closefds))
1169	CONTINUE(tcp);
1170	}
1171
1172	ret = soread(pData, so);
1173	/* Output it if we read something */
1174	if (RT_LIKELY(ret > 0))
1175	TCP_OUTPUT(pData, sototcpcb(so));
1176	}
1177
1178	/*
1179	* Check for FD_CLOSE events.
1180	* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1181	*/
1182	if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1183	\|\| (so->so_close == 1))
1184	{
1185	/*
1186	* drain the socket
1187	*/
1188	for (;;)
1189	{
1190	ret = soread(pData, so);
1191	if (ret > 0)
1192	TCP_OUTPUT(pData, sototcpcb(so));
1193	else
1194	{
1195	Log2(("%R[natsock] errno %d:%s\n", so, errno, strerror(errno)));
1196	break;
1197	}
1198	}
1199	/* mark the socket for termination _after_ it was drained */
1200	so->so_close = 1;
1201	CONTINUE(tcp);
1202	}
1203
1204	/*
1205	* Check sockets for writing
1206	*/
1207	if (CHECK_FD_SET(so, NetworkEvents, writefds))
1208	{
1209	/*
1210	* Check for non-blocking, still-connecting sockets
1211	*/
1212	if (so->so_state & SS_ISFCONNECTING)
1213	{
1214	Log2(("connecting %R[natsock] catched\n", so));
1215	/* Connected */
1216	so->so_state &= ~SS_ISFCONNECTING;
1217
1218	/*
1219	* This should be probably guarded by PROBE_CONN too. Anyway,
1220	* we disable it on OS/2 because the below send call returns
1221	* EFAULT which causes the opened TCP socket to close right
1222	* after it has been opened and connected.
1223	*/
1224	#ifndef RT_OS_OS2
1225	ret = send(so->s, (const char *)&ret, 0, 0);
1226	if (ret < 0)
1227	{
1228	/* XXXXX Must fix, zero bytes is a NOP */
1229	if ( errno == EAGAIN
1230	\|\| errno == EWOULDBLOCK
1231	\|\| errno == EINPROGRESS
1232	\|\| errno == ENOTCONN)
1233	CONTINUE(tcp);
1234
1235	/* else failed */
1236	so->so_state = SS_NOFDREF;
1237	}
1238	/* else so->so_state &= ~SS_ISFCONNECTING; */
1239	#endif
1240
1241	/*
1242	* Continue tcp_input
1243	*/
1244	TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
1245	/* continue; */
1246	}
1247	else
1248	SOWRITE(ret, pData, so);
1249	/*
1250	* XXX If we wrote something (a lot), there could be the need
1251	* for a window update. In the worst case, the remote will send
1252	* a window probe to get things going again.
1253	*/
1254	}
1255
1256	/*
1257	* Probe a still-connecting, non-blocking socket
1258	* to check if it's still alive
1259	*/
1260	#ifdef PROBE_CONN
1261	if (so->so_state & SS_ISFCONNECTING)
1262	{
1263	ret = recv(so->s, (char *)&ret, 0, 0);
1264
1265	if (ret < 0)
1266	{
1267	/* XXX */
1268	if ( errno == EAGAIN
1269	\|\| errno == EWOULDBLOCK
1270	\|\| errno == EINPROGRESS
1271	\|\| errno == ENOTCONN)
1272	{
1273	CONTINUE(tcp); /* Still connecting, continue */
1274	}
1275
1276	/* else failed */
1277	so->so_state = SS_NOFDREF;
1278
1279	/* tcp_input will take care of it */
1280	}
1281	else
1282	{
1283	ret = send(so->s, &ret, 0, 0);
1284	if (ret < 0)
1285	{
1286	/* XXX */
1287	if ( errno == EAGAIN
1288	\|\| errno == EWOULDBLOCK
1289	\|\| errno == EINPROGRESS
1290	\|\| errno == ENOTCONN)
1291	{
1292	CONTINUE(tcp);
1293	}
1294	/* else failed */
1295	so->so_state = SS_NOFDREF;
1296	}
1297	else
1298	so->so_state &= ~SS_ISFCONNECTING;
1299
1300	}
1301	TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1302	} /* SS_ISFCONNECTING */
1303	#endif
1304	LOOP_LABEL(tcp, so, so_next);
1305	}
1306
1307	/*
1308	* Now UDP sockets.
1309	* Incoming packets are sent straight away, they're not buffered.
1310	* Incoming UDP data isn't buffered either.
1311	*/
1312	QSOCKET_FOREACH(so, so_next, udp)
1313	/* { */
1314	#ifdef VBOX_WITH_SLIRP_MT
1315	if ( so->so_state & SS_NOFDREF
1316	&& so->so_deleted == 1)
1317	{
1318	struct socket son, sop = NULL;
1319	QSOCKET_LOCK(udb);
1320	if (so->so_next != NULL)
1321	{
1322	if (so->so_next != &udb)
1323	SOCKET_LOCK(so->so_next);
1324	son = so->so_next;
1325	}
1326	if ( so->so_prev != &udb
1327	&& so->so_prev != NULL)
1328	{
1329	SOCKET_LOCK(so->so_prev);
1330	sop = so->so_prev;
1331	}
1332	QSOCKET_UNLOCK(udb);
1333	remque(pData, so);
1334	NSOCK_DEC();
1335	SOCKET_UNLOCK(so);
1336	SOCKET_LOCK_DESTROY(so);
1337	RTMemFree(so);
1338	so_next = son;
1339	if (sop != NULL)
1340	SOCKET_UNLOCK(sop);
1341	CONTINUE_NO_UNLOCK(udp);
1342	}
1343	#endif
1344	POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1345
1346	LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1347
1348	if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1349	{
1350	SORECVFROM(pData, so);
1351	}
1352	LOOP_LABEL(udp, so, so_next);
1353	}
1354
1355	done:
1356
1357	STAM_PROFILE_STOP(&pData->StatPoll, a);
1358	}
1359
1360
1361	struct arphdr
1362	{
1363	unsigned short ar_hrd; /* format of hardware address */
1364	unsigned short ar_pro; /* format of protocol address */
1365	unsigned char ar_hln; /* length of hardware address */
1366	unsigned char ar_pln; /* length of protocol address */
1367	unsigned short ar_op; /* ARP opcode (command) */
1368
1369	/*
1370	* Ethernet looks like this : This bit is variable sized however...
1371	*/
1372	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1373	unsigned char ar_sip[4]; /* sender IP address */
1374	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1375	unsigned char ar_tip[4]; /* target IP address */
1376	};
1377	AssertCompileSize(struct arphdr, 28);
1378
1379	static void arp_input(PNATState pData, struct mbuf *m)
1380	{
1381	struct ethhdr *eh;
1382	struct ethhdr *reh;
1383	struct arphdr *ah;
1384	struct arphdr *rah;
1385	int ar_op;
1386	uint32_t htip;
1387	uint32_t tip;
1388	struct mbuf *mr;
1389	eh = mtod(m, struct ethhdr *);
1390	ah = (struct arphdr *)&eh[1];
1391	htip = RT_N2H_U32((uint32_t)ah->ar_tip);
1392	tip = (uint32_t)ah->ar_tip;
1393
1394	ar_op = RT_N2H_U16(ah->ar_op);
1395
1396	switch (ar_op)
1397	{
1398	case ARPOP_REQUEST:
1399	mr = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1400	if (mr == NULL)
1401	return;
1402	reh = mtod(mr, struct ethhdr *);
1403	mr->m_data += ETH_HLEN;
1404	rah = mtod(mr, struct arphdr *);
1405	mr->m_len = sizeof(struct arphdr);
1406	Assert(mr);
1407	memcpy(reh->h_source, eh->h_source, ETH_ALEN); /* XXX: if_encap will swap src and dst*/
1408	#ifdef VBOX_WITH_NAT_SERVICE
1409	if (tip == pData->special_addr.s_addr)
1410	goto arp_ok;
1411	#endif
1412	if ((htip & pData->netmask) == RT_N2H_U32(pData->special_addr.s_addr))
1413	{
1414	if ( CTL_CHECK(htip, CTL_DNS)
1415	\|\| CTL_CHECK(htip, CTL_ALIAS)
1416	\|\| CTL_CHECK(htip, CTL_TFTP))
1417	goto arp_ok;
1418	m_freem(pData, m);
1419	m_freem(pData, mr);
1420	return;
1421
1422	arp_ok:
1423	rah->ar_hrd = RT_H2N_U16_C(1);
1424	rah->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1425	rah->ar_hln = ETH_ALEN;
1426	rah->ar_pln = 4;
1427	rah->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1428	memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN);
1429
1430	switch (htip & ~pData->netmask)
1431	{
1432	case CTL_DNS:
1433	case CTL_ALIAS:
1434	rah->ar_sha[5] = (uint8_t)(htip & ~pData->netmask);
1435	break;
1436	default:;
1437	}
1438
1439	memcpy(rah->ar_sip, ah->ar_tip, 4);
1440	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
1441	memcpy(rah->ar_tip, ah->ar_sip, 4);
1442	if_encap(pData, ETH_P_ARP, mr, ETH_ENCAP_URG);
1443	m_freem(pData, m);
1444	}
1445	/* Gratuitous ARP */
1446	if ( (uint32_t )ah->ar_sip == (uint32_t )ah->ar_tip
1447	&& memcmp(ah->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1448	&& memcmp(eh->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1449	{
1450	/* we've received anounce about address asignment
1451	* Let's do ARP cache update
1452	*/
1453	if (slirp_arp_cache_update(pData, (uint32_t )ah->ar_tip, &eh->h_dest[0]) == 0)
1454	{
1455	m_freem(pData, mr);
1456	m_freem(pData, m);
1457	break;
1458	}
1459	slirp_arp_cache_add(pData, (uint32_t )ah->ar_tip, &eh->h_dest[0]);
1460	}
1461	break;
1462
1463	case ARPOP_REPLY:
1464	if (slirp_arp_cache_update(pData, (uint32_t )ah->ar_sip, &ah->ar_sha[0]) == 0)
1465	{
1466	m_freem(pData, m);
1467	break;
1468	}
1469	slirp_arp_cache_add(pData, (uint32_t )ah->ar_sip, ah->ar_sha);
1470	m_freem(pData, m);
1471	break;
1472
1473	default:
1474	break;
1475	}
1476	}
1477
1478	/**
1479	* Feed a packet into the slirp engine.
1480	*
1481	* @param m Data buffer, m_len is not valid.
1482	* @param cbBuf The length of the data in m.
1483	*/
1484	void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1485	{
1486	int proto;
1487	static bool fWarnedIpv6;
1488	struct ethhdr *eh;
1489	uint8_t au8Ether[ETH_ALEN];
1490
1491	m->m_len = cbBuf;
1492	if (cbBuf < ETH_HLEN)
1493	{
1494	LogRel(("NAT: packet having size %d has been ignored\n", m->m_len));
1495	m_freem(pData, m);
1496	return;
1497	}
1498	eh = mtod(m, struct ethhdr *);
1499	proto = RT_N2H_U16(eh->h_proto);
1500
1501	memcpy(au8Ether, eh->h_source, ETH_ALEN);
1502
1503	switch(proto)
1504	{
1505	case ETH_P_ARP:
1506	arp_input(pData, m);
1507	break;
1508
1509	case ETH_P_IP:
1510	/* Update time. Important if the network is very quiet, as otherwise
1511	* the first outgoing connection gets an incorrect timestamp. */
1512	updtime(pData);
1513	m_adj(m, ETH_HLEN);
1514	M_ASSERTPKTHDR(m);
1515	m->m_pkthdr.header = mtod(m, void *);
1516	ip_input(pData, m);
1517	break;
1518
1519	case ETH_P_IPV6:
1520	m_freem(pData, m);
1521	if (!fWarnedIpv6)
1522	{
1523	LogRel(("NAT: IPv6 not supported\n"));
1524	fWarnedIpv6 = true;
1525	}
1526	break;
1527
1528	default:
1529	Log(("NAT: Unsupported protocol %x\n", proto));
1530	m_freem(pData, m);
1531	break;
1532	}
1533
1534	if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1535	activate_port_forwarding(pData, au8Ether);
1536	}
1537
1538	/* output the IP packet to the ethernet device */
1539	void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1540	{
1541	struct ethhdr *eh;
1542	uint8_t *buf = NULL;
1543	size_t mlen = 0;
1544	STAM_PROFILE_START(&pData->StatIF_encap, a);
1545
1546	M_ASSERTPKTHDR(m);
1547	m->m_data -= ETH_HLEN;
1548	m->m_len += ETH_HLEN;
1549	eh = mtod(m, struct ethhdr *);
1550
1551	if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1552	{
1553	memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1554	memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1555	Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1556	if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1557	{
1558	/* don't do anything */
1559	m_freem(pData, m);
1560	goto done;
1561	}
1562	}
1563	mlen = m_length(m, NULL);
1564	buf = RTMemAlloc(mlen);
1565	if (buf == NULL)
1566	{
1567	LogRel(("NAT: Can't alloc memory for outgoing buffer\n"));
1568	m_freem(pData, m);
1569	goto done;
1570	}
1571	eh->h_proto = RT_H2N_U16(eth_proto);
1572	m_copydata(m, 0, mlen, (char *)buf);
1573	if (flags & ETH_ENCAP_URG)
1574	slirp_urg_output(pData->pvUser, m, buf, mlen);
1575	else
1576	slirp_output(pData->pvUser, m, buf, mlen);
1577	done:
1578	STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1579	}
1580
1581	/**
1582	* Still we're using dhcp server leasing to map ether to IP
1583	* @todo see rt_lookup_in_cache
1584	*/
1585	static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1586	{
1587	uint32_t ip = INADDR_ANY;
1588	int rc;
1589
1590	if (eth_addr == NULL)
1591	return INADDR_ANY;
1592
1593	if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1594	\|\| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1595	return INADDR_ANY;
1596
1597	rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1598	if (RT_SUCCESS(rc))
1599	return ip;
1600
1601	bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1602	/* ignore return code, ip will be set to INADDR_ANY on error */
1603	return ip;
1604	}
1605
1606	/**
1607	* We need check if we've activated port forwarding
1608	* for specific machine ... that of course relates to
1609	* service mode
1610	* @todo finish this for service case
1611	*/
1612	static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1613	{
1614	struct port_forward_rule rule, tmp;
1615
1616	/* check mac here */
1617	LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1618	{
1619	struct socket *so;
1620	struct alias_link *alias_link;
1621	struct libalias *lib;
1622	int flags;
1623	struct sockaddr sa;
1624	struct sockaddr_in *psin;
1625	socklen_t socketlen;
1626	struct in_addr alias;
1627	int rc;
1628	uint32_t guest_addr; /* need to understand if we already give address to guest */
1629
1630	if (rule->activated)
1631	continue;
1632
1633	#ifdef VBOX_WITH_NAT_SERVICE
1634	if (memcmp(rule->mac_address, h_source, ETH_ALEN) != 0)
1635	continue; /not right mac, @todo: it'd be better do the list port forwarding per mac /
1636	guest_addr = find_guest_ip(pData, h_source);
1637	#else
1638	#if 0
1639	if (memcmp(client_ethaddr, h_source, ETH_ALEN) != 0)
1640	continue;
1641	#endif
1642	guest_addr = find_guest_ip(pData, h_source);
1643	#endif
1644	if (guest_addr == INADDR_ANY)
1645	{
1646	/* the address wasn't granted */
1647	return;
1648	}
1649
1650	#if !defined(VBOX_WITH_NAT_SERVICE)
1651	if (rule->guest_addr.s_addr != guest_addr)
1652	continue;
1653	#endif
1654
1655	LogRel(("NAT: set redirect %s host port %d => guest port %d @ %R[IP4]\n",
1656	(rule->proto == IPPROTO_UDP?"UDP":"TCP"),
1657	rule->host_port, rule->guest_port, &guest_addr));
1658
1659	if (rule->proto == IPPROTO_UDP)
1660	so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1661	RT_H2N_U16(rule->guest_port), 0);
1662	else
1663	so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1664	RT_H2N_U16(rule->guest_port), 0);
1665
1666	if (so == NULL)
1667	goto remove_port_forwarding;
1668
1669	psin = (struct sockaddr_in *)&sa;
1670	psin->sin_family = AF_INET;
1671	psin->sin_port = 0;
1672	psin->sin_addr.s_addr = INADDR_ANY;
1673	socketlen = sizeof(struct sockaddr);
1674
1675	rc = getsockname(so->s, &sa, &socketlen);
1676	if (rc < 0 \|\| sa.sa_family != AF_INET)
1677	goto remove_port_forwarding;
1678
1679	psin = (struct sockaddr_in *)&sa;
1680
1681	lib = LibAliasInit(pData, NULL);
1682	flags = LibAliasSetMode(lib, 0, 0);
1683	flags \|= pData->i32AliasMode;
1684	flags \|= PKT_ALIAS_REVERSE; /* set reverse */
1685	flags = LibAliasSetMode(lib, flags, ~0);
1686
1687	alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) \| CTL_ALIAS);
1688	alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
1689	alias, RT_H2N_U16(rule->guest_port),
1690	pData->special_addr, -1, /* not very clear for now */
1691	rule->proto);
1692	if (!alias_link)
1693	goto remove_port_forwarding;
1694
1695	so->so_la = lib;
1696	rule->activated = 1;
1697	pData->cRedirectionsActive++;
1698	continue;
1699
1700	remove_port_forwarding:
1701	LogRel(("NAT: failed to redirect %s %d => %d\n",
1702	(rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
1703	LIST_REMOVE(rule, list);
1704	pData->cRedirectionsStored--;
1705	RTMemFree(rule);
1706	}
1707	}
1708
1709	/**
1710	* Changes in 3.1 instead of opening new socket do the following:
1711	* gain more information:
1712	* 1. bind IP
1713	* 2. host port
1714	* 3. guest port
1715	* 4. proto
1716	* 5. guest MAC address
1717	* the guest's MAC address is rather important for service, but we easily
1718	* could get it from VM configuration in DrvNAT or Service, the idea is activating
1719	* corresponding port-forwarding
1720	*/
1721	int slirp_redir(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1722	struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1723	{
1724	struct port_forward_rule *rule = NULL;
1725	Assert(memcmp(ethaddr, zerro_ethaddr, ETH_ALEN) == 0);
1726
1727	rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1728	if (rule == NULL)
1729	return 1;
1730
1731	rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1732	rule->host_port = host_port;
1733	rule->guest_port = guest_port;
1734	#ifndef VBOX_WITH_NAT_SERVICE
1735	rule->guest_addr.s_addr = guest_addr.s_addr;
1736	#endif
1737	rule->bind_ip.s_addr = host_addr.s_addr;
1738	memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1739	/* @todo add mac address */
1740	LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1741	pData->cRedirectionsStored++;
1742	return 0;
1743	}
1744
1745	void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1746	{
1747	#ifndef VBOX_WITH_NAT_SERVICE
1748	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1749	#endif
1750	if (GuestIP != INADDR_ANY)
1751	{
1752	slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1753	activate_port_forwarding(pData, ethaddr);
1754	}
1755	}
1756
1757	#if defined(RT_OS_WINDOWS)
1758	HANDLE *slirp_get_events(PNATState pData)
1759	{
1760	return pData->phEvents;
1761	}
1762	void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1763	{
1764	pData->phEvents[index] = hEvent;
1765	}
1766	#endif
1767
1768	unsigned int slirp_get_timeout_ms(PNATState pData)
1769	{
1770	if (link_up)
1771	{
1772	if (time_fasttimo)
1773	return 2;
1774	if (do_slowtimo)
1775	return 500; /* see PR_SLOWHZ */
1776	}
1777	return 36001000; / one hour */
1778	}
1779
1780	#ifndef RT_OS_WINDOWS
1781	int slirp_get_nsock(PNATState pData)
1782	{
1783	return pData->nsock;
1784	}
1785	#endif
1786
1787	/*
1788	* this function called from NAT thread
1789	*/
1790	void slirp_post_sent(PNATState pData, void *pvArg)
1791	{
1792	struct socket *so = 0;
1793	struct tcpcb *tp = 0;
1794	struct mbuf m = (struct mbuf )pvArg;
1795	m_freem(pData, m);
1796	}
1797	#ifdef VBOX_WITH_SLIRP_MT
1798	void slirp_process_queue(PNATState pData)
1799	{
1800	RTReqProcess(pData->pReqQueue, RT_INDEFINITE_WAIT);
1801	}
1802	void *slirp_get_queue(PNATState pData)
1803	{
1804	return pData->pReqQueue;
1805	}
1806	#endif
1807
1808	void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1809	{
1810	Log2(("tftp_prefix:%s\n", tftpPrefix));
1811	tftp_prefix = tftpPrefix;
1812	}
1813
1814	void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1815	{
1816	Log2(("bootFile:%s\n", bootFile));
1817	bootp_filename = bootFile;
1818	}
1819
1820	void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1821	{
1822	Log2(("next_server:%s\n", next_server));
1823	if (next_server == NULL)
1824	pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_TFTP);
1825	else
1826	inet_aton(next_server, &pData->tftp_server);
1827	}
1828
1829	int slirp_set_binding_address(PNATState pData, char *addr)
1830	{
1831	if (addr == NULL \|\| (inet_aton(addr, &pData->bindIP) == 0))
1832	{
1833	pData->bindIP.s_addr = INADDR_ANY;
1834	return 1;
1835	}
1836	return 0;
1837	}
1838
1839	void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1840	{
1841	if (!pData->fUseHostResolver)
1842	{
1843	Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1844	pData->fUseDnsProxy = fDNSProxy;
1845	}
1846	else
1847	LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1848	}
1849
1850	#define CHECK_ARG(name, val, lim_min, lim_max) \
1851	do { \
1852	if ((val) < (lim_min) \|\| (val) > (lim_max)) \
1853	{ \
1854	LogRel(("NAT: (" #name ":%d) has been ignored, " \
1855	"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1856	return; \
1857	} \
1858	else \
1859	LogRel(("NAT: (" #name ":%d)\n", (val))); \
1860	} while (0)
1861
1862	/* don't allow user set less 8kB and more than 1M values */
1863	#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1864	void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1865	{
1866	_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1867	pData->socket_rcv = kilobytes;
1868	}
1869	void slirp_set_sndbuf(PNATState pData, int kilobytes)
1870	{
1871	_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1872	pData->socket_snd = kilobytes * _1K;
1873	}
1874	void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1875	{
1876	_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1877	tcp_rcvspace = kilobytes * _1K;
1878	}
1879	void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1880	{
1881	_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1882	tcp_sndspace = kilobytes * _1K;
1883	}
1884
1885	/*
1886	* Looking for Ether by ip in ARP-cache
1887	* Note: it´s responsible of caller to allocate buffer for result
1888	* @returns iprt status code
1889	*/
1890	int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1891	{
1892	struct arp_cache_entry *ac;
1893
1894	if (ether == NULL)
1895	return VERR_INVALID_PARAMETER;
1896
1897	if (LIST_EMPTY(&pData->arp_cache))
1898	return VERR_NOT_FOUND;
1899
1900	LIST_FOREACH(ac, &pData->arp_cache, list)
1901	{
1902	if (ac->ip == ip)
1903	{
1904	memcpy(ether, ac->ether, ETH_ALEN);
1905	return VINF_SUCCESS;
1906	}
1907	}
1908	return VERR_NOT_FOUND;
1909	}
1910
1911	/*
1912	* Looking for IP by Ether in ARP-cache
1913	* Note: it´s responsible of caller to allocate buffer for result
1914	* @returns 0 - if found, 1 - otherwise
1915	*/
1916	int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t ether, uint32_t ip)
1917	{
1918	struct arp_cache_entry *ac;
1919	*ip = INADDR_ANY;
1920
1921	if (LIST_EMPTY(&pData->arp_cache))
1922	return VERR_NOT_FOUND;
1923
1924	LIST_FOREACH(ac, &pData->arp_cache, list)
1925	{
1926	if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1927	{
1928	*ip = ac->ip;
1929	return VINF_SUCCESS;
1930	}
1931	}
1932	return VERR_NOT_FOUND;
1933	}
1934
1935	void slirp_arp_who_has(PNATState pData, uint32_t dst)
1936	{
1937	struct mbuf *m;
1938	struct ethhdr *ehdr;
1939	struct arphdr *ahdr;
1940
1941	m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1942	if (m == NULL)
1943	{
1944	LogRel(("NAT: Can't alloc mbuf for ARP request\n"));
1945	return;
1946	}
1947	ehdr = mtod(m, struct ethhdr *);
1948	memset(ehdr->h_source, 0xff, ETH_ALEN);
1949	ahdr = (struct arphdr *)&ehdr[1];
1950	ahdr->ar_hrd = RT_H2N_U16_C(1);
1951	ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1952	ahdr->ar_hln = ETH_ALEN;
1953	ahdr->ar_pln = 4;
1954	ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1955	memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1956	(uint32_t )ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) \| CTL_ALIAS);
1957	memset(ahdr->ar_tha, 0xff, ETH_ALEN); /broadcast/
1958	(uint32_t )ahdr->ar_tip = dst;
1959	/* warn!!! should falls in mbuf minimal size */
1960	m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1961	m->m_data += ETH_HLEN;
1962	m->m_len -= ETH_HLEN;
1963	if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1964	}
1965
1966	int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1967	{
1968	if (slirp_arp_cache_update(pData, dst, mac))
1969	slirp_arp_cache_add(pData, dst, mac);
1970
1971	return 0;
1972	}
1973
1974	/* updates the arp cache
1975	* @returns 0 - if has found and updated
1976	* 1 - if hasn't found.
1977	*/
1978	int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1979	{
1980	struct arp_cache_entry *ac;
1981	LIST_FOREACH(ac, &pData->arp_cache, list)
1982	{
1983	if (memcmp(ac->ether, mac, ETH_ALEN) == 0)
1984	{
1985	ac->ip = dst;
1986	return 0;
1987	}
1988	}
1989	return 1;
1990	}
1991
1992	void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1993	{
1994	struct arp_cache_entry *ac = NULL;
1995	ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1996	if (ac == NULL)
1997	{
1998	LogRel(("NAT: Can't allocate arp cache entry\n"));
1999	return;
2000	}
2001	ac->ip = ip;
2002	memcpy(ac->ether, ether, ETH_ALEN);
2003	LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
2004	}
2005
2006	void slirp_set_mtu(PNATState pData, int mtu)
2007	{
2008	if (mtu < 20 \|\| mtu >= 16000)
2009	{
2010	LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
2011	mtu = 1500;
2012	}
2013	if_mtu =
2014	if_mru = mtu;
2015	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 30016

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