slirp.c@ 11284

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1	#include "slirp.h"
2	#ifdef RT_OS_OS2
3	# include <paths.h>
4	#endif
5
6	#include <VBox/err.h>
7	#include <iprt/assert.h>
8
9	static const uint8_t special_ethaddr[6] = {
10	0x52, 0x54, 0x00, 0x12, 0x35, 0x00
11	};
12
13	#ifdef _WIN32
14
15	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
16	struct in_addr *pdns_addr,
17	const char **ppszDomain)
18	{
19	int rc = 0;
20	FIXED_INFO *FixedInfo=NULL;
21	ULONG BufLen;
22	DWORD ret;
23	IP_ADDR_STRING *pIPAddr;
24	struct in_addr tmp_addr;
25
26	FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
27	BufLen = sizeof(FIXED_INFO);
28
29	/** @todo: this API returns all DNS servers, no matter whether the
30	* corresponding network adapter is disabled or not. Maybe replace
31	* this by GetAdapterAddresses(), which is XP/Vista only though. */
32	if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
33	if (FixedInfo) {
34	GlobalFree(FixedInfo);
35	FixedInfo = NULL;
36	}
37	FixedInfo = GlobalAlloc(GPTR, BufLen);
38	}
39
40	if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
41	Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
42	if (FixedInfo) {
43	GlobalFree(FixedInfo);
44	FixedInfo = NULL;
45	}
46	rc = -1;
47	goto get_dns_prefix;
48	}
49
50	pIPAddr = &(FixedInfo->DnsServerList);
51	inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
52	Log(("nat: DNS Servers:\n"));
53	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
54	LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
55	*pdns_addr = tmp_addr;
56
57	pIPAddr = FixedInfo -> DnsServerList.Next;
58	while ( pIPAddr )
59	{
60	if (fVerbose)
61	LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
62	pIPAddr = pIPAddr ->Next;
63	}
64	if (FixedInfo) {
65	GlobalFree(FixedInfo);
66	FixedInfo = NULL;
67	}
68
69	get_dns_prefix:
70	if (ppszDomain)
71	{
72	OSVERSIONINFO ver;
73	char szDnsDomain[256];
74	DWORD dwSize = sizeof(szDnsDomain);
75
76	*ppszDomain = NULL;
77	GetVersionEx(&ver);
78	if (ver.dwMajorVersion >= 5)
79	{
80	/* GetComputerNameEx exists in Windows versions starting with 2000. */
81	if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
82	{
83	if (szDnsDomain[0])
84	{
85	/* Just non-empty strings are valid. */
86	*ppszDomain = RTStrDup(szDnsDomain);
87	if (pData->fPassDomain)
88	{
89	if (fVerbose)
90	LogRel(("NAT: passing domain name %s\n", szDnsDomain));
91	}
92	else
93	Log(("nat: ignoring domain %s\n", szDnsDomain));
94	}
95	}
96	else
97	Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
98	}
99	}
100	return rc;
101	}
102
103	#else
104
105	static int get_dns_addr_domain(PNATState pData, bool fVerbose,
106	struct in_addr *pdns_addr,
107	const char **ppszDomain)
108	{
109	char buff[512];
110	char buff2[256];
111	FILE *f;
112	int found = 0;
113	struct in_addr tmp_addr;
114
115	#ifdef RT_OS_OS2
116	/* Try various locations. */
117	char *etc = getenv("ETC");
118	f = NULL;
119	if (etc)
120	{
121	snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
122	f = fopen(buff, "rt");
123	}
124	if (!f) {
125	snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
126	f = fopen(buff, "rt");
127	}
128	if (!f) {
129	snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
130	f = fopen(buff, "rt");
131	}
132	#else
133	f = fopen("/etc/resolv.conf", "r");
134	#endif
135	if (!f)
136	return -1;
137
138	if (ppszDomain)
139	*ppszDomain = NULL;
140	Log(("nat: DNS Servers:\n"));
141	while (fgets(buff, 512, f) != NULL) {
142	if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
143	if (!inet_aton(buff2, &tmp_addr))
144	continue;
145	if (tmp_addr.s_addr == loopback_addr.s_addr)
146	tmp_addr = our_addr;
147	/* If it's the first one, set it to dns_addr */
148	if (!found)
149	{
150	if (fVerbose \|\| pdns_addr->s_addr != tmp_addr.s_addr)
151	LogRel(("NAT: DNS address: %s\n", buff2));
152	*pdns_addr = tmp_addr;
153	}
154	else
155	{
156	if (fVerbose)
157	LogRel(("NAT: ignored DNS address: %s\n", buff2));
158	}
159	found++;
160	}
161	if ( ppszDomain
162	&& (!strncmp(buff, "domain", 6) \|\| !strncmp(buff, "search", 6)))
163	{
164	/* Domain name/search list present. Pick first entry */
165	if (*ppszDomain == NULL)
166	{
167	char *tok;
168	char *saveptr;
169	tok = strtok_r(&buff[6], " \t\n", &saveptr);
170	if (tok)
171	{
172	*ppszDomain = RTStrDup(tok);
173	if (pData->fPassDomain)
174	{
175	if (fVerbose)
176	LogRel(("NAT: passing domain name %s\n", tok));
177	}
178	else
179	Log(("nat: ignoring domain %s\n", tok));
180	}
181	}
182	}
183	}
184	fclose(f);
185	if (!found)
186	return -1;
187	return 0;
188	}
189
190	#endif
191
192	int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
193	{
194	return get_dns_addr_domain(pData, false, pdns_addr, NULL);
195	}
196
197	int slirp_init(PNATState ppData, const char pszNetAddr, uint32_t u32Netmask,
198	bool fPassDomain, const char *pszTFTPPrefix,
199	const char pszBootFile, void pvUser)
200	{
201	int fNATfailed = 0;
202	PNATState pData = malloc(sizeof(NATState));
203	*ppData = pData;
204	if (!pData)
205	return VERR_NO_MEMORY;
206	if (u32Netmask & 0x1f)
207	/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
208	return VERR_INVALID_PARAMETER;
209	memset(pData, '\0', sizeof(NATState));
210	pData->fPassDomain = fPassDomain;
211	pData->pvUser = pvUser;
212	#if ARCH_BITS == 64
213	pData->cpvHashUsed = 1;
214	#endif
215	tftp_prefix = pszTFTPPrefix;
216	bootp_filename = pszBootFile;
217	pData->netmask = u32Netmask;
218
219	#ifdef _WIN32
220	{
221	WSADATA Data;
222	WSAStartup(MAKEWORD(2,0), &Data);
223	}
224	#endif
225
226	Assert(sizeof(struct ip) == 20);
227	link_up = 1;
228
229	if_init(pData);
230	ip_init(pData);
231
232	/* Initialise mbufs after setting the MTU */
233	m_init(pData);
234
235	/* set default addresses */
236	inet_aton("127.0.0.1", &loopback_addr);
237	inet_aton("127.0.0.1", &dns_addr);
238
239	if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
240	fNATfailed = 1;
241
242	inet_aton(pszNetAddr, &special_addr);
243	alias_addr.s_addr = special_addr.s_addr \| htonl(CTL_ALIAS);
244	getouraddr(pData);
245	return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
246	}
247
248	/**
249	* Marks the link as up, making it possible to establish new connections.
250	*/
251	void slirp_link_up(PNATState pData)
252	{
253	link_up = 1;
254	}
255
256	/**
257	* Marks the link as down and cleans up the current connections.
258	*/
259	void slirp_link_down(PNATState pData)
260	{
261	struct socket *so;
262
263	while ((so = tcb.so_next) != &tcb)
264	{
265	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
266	sofree(pData, so);
267	else
268	tcp_drop(pData, sototcpcb(so), 0);
269	}
270
271	while ((so = udb.so_next) != &udb)
272	udp_detach(pData, so);
273
274	link_up = 0;
275	}
276
277	/**
278	* Terminates the slirp component.
279	*/
280	void slirp_term(PNATState pData)
281	{
282	if (pData->pszDomain)
283	RTStrFree((char )(void )pData->pszDomain);
284
285	#if ARCH_BITS == 64
286	LogRel(("NAT: cpvHashUsed=%RU32 cpvHashCollisions=%RU32 cpvHashInserts=%RU64 cpvHashDone=%RU64\n",
287	pData->cpvHashUsed, pData->cpvHashCollisions, pData->cpvHashInserts, pData->cpvHashDone));
288	#endif
289
290	slirp_link_down(pData);
291	#ifdef WIN32
292	WSACleanup();
293	#endif
294	#ifdef LOG_ENABLED
295	Log(("\n"
296	"NAT statistics\n"
297	"--------------\n"
298	"\n"));
299	ipstats(pData);
300	tcpstats(pData);
301	udpstats(pData);
302	icmpstats(pData);
303	mbufstats(pData);
304	sockstats(pData);
305	Log(("\n"
306	"\n"
307	"\n"));
308	#endif
309	free(pData);
310	}
311
312
313	#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
314	#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE\|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
315	#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
316
317	/*
318	* curtime kept to an accuracy of 1ms
319	*/
320	#ifdef _WIN32
321	static void updtime(PNATState pData)
322	{
323	struct _timeb tb;
324
325	_ftime(&tb);
326	curtime = (u_int)tb.time * (u_int)1000;
327	curtime += (u_int)tb.millitm;
328	}
329	#else
330	static void updtime(PNATState pData)
331	{
332	gettimeofday(&tt, 0);
333
334	curtime = (u_int)tt.tv_sec * (u_int)1000;
335	curtime += (u_int)tt.tv_usec / (u_int)1000;
336
337	if ((tt.tv_usec % 1000) >= 500)
338	curtime++;
339	}
340	#endif
341
342	void slirp_select_fill(PNATState pData, int *pnfds,
343	fd_set readfds, fd_set writefds, fd_set *xfds)
344	{
345	struct socket so, so_next;
346	struct timeval timeout;
347	int nfds;
348	int tmp_time;
349
350	nfds = *pnfds;
351	/*
352	* First, TCP sockets
353	*/
354	do_slowtimo = 0;
355	if (link_up) {
356	/*
357	* *_slowtimo needs calling if there are IP fragments
358	* in the fragment queue, or there are TCP connections active
359	*/
360	do_slowtimo = ((tcb.so_next != &tcb) \|\|
361	((struct ipasfrag )&ipq != u32_to_ptr(pData, ipq.next, struct ipasfrag )));
362
363	for (so = tcb.so_next; so != &tcb; so = so_next) {
364	so_next = so->so_next;
365
366	/*
367	* See if we need a tcp_fasttimo
368	*/
369	if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
370	time_fasttimo = curtime; /* Flag when we want a fasttimo */
371
372	/*
373	* NOFDREF can include still connecting to local-host,
374	* newly socreated() sockets etc. Don't want to select these.
375	*/
376	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
377	continue;
378
379	/*
380	* Set for reading sockets which are accepting
381	*/
382	if (so->so_state & SS_FACCEPTCONN) {
383	FD_SET(so->s, readfds);
384	UPD_NFDS(so->s);
385	continue;
386	}
387
388	/*
389	* Set for writing sockets which are connecting
390	*/
391	if (so->so_state & SS_ISFCONNECTING) {
392	FD_SET(so->s, writefds);
393	UPD_NFDS(so->s);
394	continue;
395	}
396
397	/*
398	* Set for writing if we are connected, can send more, and
399	* we have something to send
400	*/
401	if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
402	FD_SET(so->s, writefds);
403	UPD_NFDS(so->s);
404	}
405
406	/*
407	* Set for reading (and urgent data) if we are connected, can
408	* receive more, and we have room for it XXX /2 ?
409	*/
410	if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
411	FD_SET(so->s, readfds);
412	FD_SET(so->s, xfds);
413	UPD_NFDS(so->s);
414	}
415	}
416
417	/*
418	* UDP sockets
419	*/
420	for (so = udb.so_next; so != &udb; so = so_next) {
421	so_next = so->so_next;
422
423	/*
424	* See if it's timed out
425	*/
426	if (so->so_expire) {
427	if (so->so_expire <= curtime) {
428	udp_detach(pData, so);
429	continue;
430	} else
431	do_slowtimo = 1; /* Let socket expire */
432	}
433
434	/*
435	* When UDP packets are received from over the
436	* link, they're sendto()'d straight away, so
437	* no need for setting for writing
438	* Limit the number of packets queued by this session
439	* to 4. Note that even though we try and limit this
440	* to 4 packets, the session could have more queued
441	* if the packets needed to be fragmented
442	* (XXX <= 4 ?)
443	*/
444	if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
445	FD_SET(so->s, readfds);
446	UPD_NFDS(so->s);
447	}
448	}
449	}
450
451	/*
452	* Setup timeout to use minimum CPU usage, especially when idle
453	*/
454
455	/*
456	* First, see the timeout needed by *timo
457	*/
458	timeout.tv_sec = 0;
459	timeout.tv_usec = -1;
460	/*
461	* If a slowtimo is needed, set timeout to 500ms from the last
462	* slow timeout. If a fast timeout is needed, set timeout within
463	* 200ms of when it was requested.
464	*/
465	if (do_slowtimo) {
466	/* XXX + 10000 because some select()'s aren't that accurate */
467	timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000;
468	if (timeout.tv_usec < 0)
469	timeout.tv_usec = 0;
470	else if (timeout.tv_usec > 510000)
471	timeout.tv_usec = 510000;
472
473	/* Can only fasttimo if we also slowtimo */
474	if (time_fasttimo) {
475	tmp_time = (200 - (curtime - time_fasttimo)) * 1000;
476	if (tmp_time < 0)
477	tmp_time = 0;
478
479	/* Choose the smallest of the 2 */
480	if (tmp_time < timeout.tv_usec)
481	timeout.tv_usec = (u_int)tmp_time;
482	}
483	}
484	*pnfds = nfds;
485	}
486
487	void slirp_select_poll(PNATState pData, fd_set readfds, fd_set writefds, fd_set *xfds)
488	{
489	struct socket so, so_next;
490	int ret;
491
492	/* Update time */
493	updtime(pData);
494
495	/*
496	* See if anything has timed out
497	*/
498	if (link_up) {
499	if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
500	tcp_fasttimo(pData);
501	time_fasttimo = 0;
502	}
503	if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
504	ip_slowtimo(pData);
505	tcp_slowtimo(pData);
506	last_slowtimo = curtime;
507	}
508	}
509
510	/*
511	* Check sockets
512	*/
513	if (link_up) {
514	/*
515	* Check TCP sockets
516	*/
517	for (so = tcb.so_next; so != &tcb; so = so_next) {
518	so_next = so->so_next;
519
520	/*
521	* FD_ISSET is meaningless on these sockets
522	* (and they can crash the program)
523	*/
524	if (so->so_state & SS_NOFDREF \|\| so->s == -1)
525	continue;
526
527	/*
528	* Check for URG data
529	* This will soread as well, so no need to
530	* test for readfds below if this succeeds
531	*/
532	if (FD_ISSET(so->s, xfds))
533	sorecvoob(pData, so);
534	/*
535	* Check sockets for reading
536	*/
537	else if (FD_ISSET(so->s, readfds)) {
538	/*
539	* Check for incoming connections
540	*/
541	if (so->so_state & SS_FACCEPTCONN) {
542	tcp_connect(pData, so);
543	continue;
544	} /* else */
545	ret = soread(pData, so);
546
547	/* Output it if we read something */
548	if (ret > 0)
549	tcp_output(pData, sototcpcb(so));
550	}
551
552	/*
553	* Check sockets for writing
554	*/
555	if (FD_ISSET(so->s, writefds)) {
556	/*
557	* Check for non-blocking, still-connecting sockets
558	*/
559	if (so->so_state & SS_ISFCONNECTING) {
560	/* Connected */
561	so->so_state &= ~SS_ISFCONNECTING;
562
563	/*
564	* This should be probably guarded by PROBE_CONN too. Anyway,
565	* we disable it on OS/2 because the below send call returns
566	* EFAULT which causes the opened TCP socket to close right
567	* after it has been opened and connected.
568	*/
569	#ifndef RT_OS_OS2
570	ret = send(so->s, (const char *)&ret, 0, 0);
571	if (ret < 0) {
572	/* XXXXX Must fix, zero bytes is a NOP */
573	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
574	errno == EINPROGRESS \|\| errno == ENOTCONN)
575	continue;
576
577	/* else failed */
578	so->so_state = SS_NOFDREF;
579	}
580	/* else so->so_state &= ~SS_ISFCONNECTING; */
581	#endif
582
583	/*
584	* Continue tcp_input
585	*/
586	tcp_input(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
587	/* continue; */
588	} else
589	ret = sowrite(pData, so);
590	/*
591	* XXXXX If we wrote something (a lot), there
592	* could be a need for a window update.
593	* In the worst case, the remote will send
594	* a window probe to get things going again
595	*/
596	}
597
598	/*
599	* Probe a still-connecting, non-blocking socket
600	* to check if it's still alive
601	*/
602	#ifdef PROBE_CONN
603	if (so->so_state & SS_ISFCONNECTING) {
604	ret = recv(so->s, (char *)&ret, 0,0);
605
606	if (ret < 0) {
607	/* XXX */
608	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
609	errno == EINPROGRESS \|\| errno == ENOTCONN)
610	continue; /* Still connecting, continue */
611
612	/* else failed */
613	so->so_state = SS_NOFDREF;
614
615	/* tcp_input will take care of it */
616	} else {
617	ret = send(so->s, &ret, 0,0);
618	if (ret < 0) {
619	/* XXX */
620	if (errno == EAGAIN \|\| errno == EWOULDBLOCK \|\|
621	errno == EINPROGRESS \|\| errno == ENOTCONN)
622	continue;
623	/* else failed */
624	so->so_state = SS_NOFDREF;
625	} else
626	so->so_state &= ~SS_ISFCONNECTING;
627
628	}
629	tcp_input((struct mbuf *)NULL, sizeof(struct ip),so);
630	} /* SS_ISFCONNECTING */
631	#endif
632	}
633
634	/*
635	* Now UDP sockets.
636	* Incoming packets are sent straight away, they're not buffered.
637	* Incoming UDP data isn't buffered either.
638	*/
639	for (so = udb.so_next; so != &udb; so = so_next) {
640	so_next = so->so_next;
641
642	if (so->s != -1 && FD_ISSET(so->s, readfds)) {
643	sorecvfrom(pData, so);
644	}
645	}
646	}
647
648	/*
649	* See if we can start outputting
650	*/
651	if (if_queued && link_up)
652	if_start(pData);
653	}
654
655	#define ETH_ALEN 6
656	#define ETH_HLEN 14
657
658	#define ETH_P_IP 0x0800 /* Internet Protocol packet */
659	#define ETH_P_ARP 0x0806 /* Address Resolution packet */
660
661	#define ARPOP_REQUEST 1 /* ARP request */
662	#define ARPOP_REPLY 2 /* ARP reply */
663
664	struct ethhdr
665	{
666	unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
667	unsigned char h_source[ETH_ALEN]; /* source ether addr */
668	unsigned short h_proto; /* packet type ID field */
669	};
670
671	struct arphdr
672	{
673	unsigned short ar_hrd; /* format of hardware address */
674	unsigned short ar_pro; /* format of protocol address */
675	unsigned char ar_hln; /* length of hardware address */
676	unsigned char ar_pln; /* length of protocol address */
677	unsigned short ar_op; /* ARP opcode (command) */
678
679	/*
680	* Ethernet looks like this : This bit is variable sized however...
681	*/
682	unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
683	unsigned char ar_sip[4]; /* sender IP address */
684	unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
685	unsigned char ar_tip[4]; /* target IP address */
686	};
687
688	static
689	void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
690	{
691	struct ethhdr eh = (struct ethhdr )pkt;
692	struct arphdr ah = (struct arphdr )(pkt + ETH_HLEN);
693	uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)];
694	struct ethhdr reh = (struct ethhdr )arp_reply;
695	struct arphdr rah = (struct arphdr )(arp_reply + ETH_HLEN);
696	int ar_op;
697	struct ex_list *ex_ptr;
698	uint32_t htip = ntohl((uint32_t)ah->ar_tip);
699
700	ar_op = ntohs(ah->ar_op);
701	switch(ar_op) {
702	case ARPOP_REQUEST:
703	if ((htip & pData->netmask) == ntohl(special_addr.s_addr)) {
704	if ( (htip & ~pData->netmask) == CTL_DNS
705	\|\| (htip & ~pData->netmask) == CTL_ALIAS)
706	goto arp_ok;
707	for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
708	if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
709	goto arp_ok;
710	}
711	return;
712	arp_ok:
713	/* XXX: make an ARP request to have the client address */
714	memcpy(client_ethaddr, eh->h_source, ETH_ALEN);
715
716	/* ARP request for alias/dns mac address */
717	memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
718	memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
719	reh->h_source[5] = ah->ar_tip[3];
720	reh->h_proto = htons(ETH_P_ARP);
721
722	rah->ar_hrd = htons(1);
723	rah->ar_pro = htons(ETH_P_IP);
724	rah->ar_hln = ETH_ALEN;
725	rah->ar_pln = 4;
726	rah->ar_op = htons(ARPOP_REPLY);
727	memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
728	memcpy(rah->ar_sip, ah->ar_tip, 4);
729	memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
730	memcpy(rah->ar_tip, ah->ar_sip, 4);
731	slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
732	}
733	break;
734	default:
735	break;
736	}
737	}
738
739	void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
740	{
741	struct mbuf *m;
742	int proto;
743
744	if (pkt_len < ETH_HLEN)
745	return;
746
747	proto = ntohs((uint16_t )(pkt + 12));
748	switch(proto) {
749	case ETH_P_ARP:
750	arp_input(pData, pkt, pkt_len);
751	break;
752	case ETH_P_IP:
753	/* Update time. Important if the network is very quiet, as otherwise
754	* the first outgoing connection gets an incorrect timestamp. */
755	updtime(pData);
756
757	m = m_get(pData);
758	if (!m)
759	return;
760	/* Note: we add to align the IP header */
761	if (M_FREEROOM(m) < pkt_len + 2) {
762	m_inc(m, pkt_len + 2);
763	}
764	m->m_len = pkt_len + 2;
765	memcpy(m->m_data + 2, pkt, pkt_len);
766
767	m->m_data += 2 + ETH_HLEN;
768	m->m_len -= 2 + ETH_HLEN;
769
770	ip_input(pData, m);
771	break;
772	default:
773	break;
774	}
775	}
776
777	/* output the IP packet to the ethernet device */
778	void if_encap(PNATState pData, const uint8_t *ip_data, int ip_data_len)
779	{
780	uint8_t buf[1600];
781	struct ethhdr eh = (struct ethhdr )buf;
782
783	if (ip_data_len + ETH_HLEN > sizeof(buf))
784	return;
785
786	memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
787	memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
788	/* XXX: not correct */
789	eh->h_source[5] = CTL_ALIAS;
790	eh->h_proto = htons(ETH_P_IP);
791	memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
792	slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
793	}
794
795	int slirp_redir(PNATState pData, int is_udp, int host_port,
796	struct in_addr guest_addr, int guest_port)
797	{
798	if (is_udp) {
799	if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
800	htons(guest_port), 0))
801	return -1;
802	} else {
803	if (!solisten(pData, htons(host_port), guest_addr.s_addr,
804	htons(guest_port), 0))
805	return -1;
806	}
807	return 0;
808	}
809
810	int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
811	int guest_port)
812	{
813	return add_exec(&exec_list, do_pty, (char *)args,
814	addr_low_byte, htons(guest_port));
815	}
816
817	void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
818	{
819	memcpy(client_ethaddr, ethaddr, ETH_ALEN);
820	}

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source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 11284

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