socket.c@ 37423

Last change on this file since 37423 was 37423, checked in by vboxsync, 13 years ago
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1	/* $Id: socket.c 37423 2011-06-12 18:37:56Z vboxsync $ */
2	/** @file
3	* NAT - socket handling.
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	* Copyright (c) 1995 Danny Gasparovski.
22	*
23	* Please read the file COPYRIGHT for the
24	* terms and conditions of the copyright.
25	*/
26
27	#define WANT_SYS_IOCTL_H
28	#include <slirp.h>
29	#include "ip_icmp.h"
30	#include "main.h"
31	#ifdef __sun__
32	#include <sys/filio.h>
33	#endif
34	#include <VBox/vmm/pdmdrv.h>
35	#if defined (RT_OS_WINDOWS)
36	#include <iphlpapi.h>
37	#include <icmpapi.h>
38	#endif
39
40
41	static void send_icmp_to_guest(PNATState, char , size_t, struct socket , const struct sockaddr_in *);
42	#ifdef RT_OS_WINDOWS
43	static void sorecvfrom_icmp_win(PNATState, struct socket *);
44	#else /* RT_OS_WINDOWS */
45	static void sorecvfrom_icmp_unix(PNATState, struct socket *);
46	#endif /* !RT_OS_WINDOWS */
47
48	void
49	so_init()
50	{
51	}
52
53	struct socket *
54	solookup(struct socket *head, struct in_addr laddr,
55	u_int lport, struct in_addr faddr, u_int fport)
56	{
57	struct socket *so;
58
59	for (so = head->so_next; so != head; so = so->so_next)
60	{
61	if ( so->so_lport == lport
62	&& so->so_laddr.s_addr == laddr.s_addr
63	&& so->so_faddr.s_addr == faddr.s_addr
64	&& so->so_fport == fport)
65	return so;
66	}
67
68	return (struct socket *)NULL;
69	}
70
71	/*
72	* Create a new socket, initialise the fields
73	* It is the responsibility of the caller to
74	* insque() it into the correct linked-list
75	*/
76	struct socket *
77	socreate()
78	{
79	struct socket *so;
80
81	so = (struct socket *)RTMemAllocZ(sizeof(struct socket));
82	if (so)
83	{
84	so->so_state = SS_NOFDREF;
85	so->s = -1;
86	#if !defined(RT_OS_WINDOWS)
87	so->so_poll_index = -1;
88	#endif
89	}
90	return so;
91	}
92
93	/*
94	* remque and free a socket, clobber cache
95	* VBOX_WITH_SLIRP_MT: before sofree queue should be locked, because
96	* in sofree we don't know from which queue item beeing removed.
97	*/
98	void
99	sofree(PNATState pData, struct socket *so)
100	{
101	struct socket *so_prev = NULL;
102	if (so == tcp_last_so)
103	tcp_last_so = &tcb;
104	else if (so == udp_last_so)
105	udp_last_so = &udb;
106
107	/* check if mbuf haven't been already freed */
108	if (so->so_m != NULL)
109	m_freem(pData, so->so_m);
110	#ifndef VBOX_WITH_SLIRP_MT
111	if (so->so_next && so->so_prev)
112	{
113	remque(pData, so); /* crashes if so is not in a queue */
114	NSOCK_DEC();
115	}
116
117	RTMemFree(so);
118	#else
119	so->so_deleted = 1;
120	#endif
121	}
122
123	#ifdef VBOX_WITH_SLIRP_MT
124	void
125	soread_queue(PNATState pData, struct socket so, int ret)
126	{
127	*ret = soread(pData, so);
128	}
129	#endif
130
131	/*
132	* Read from so's socket into sb_snd, updating all relevant sbuf fields
133	* NOTE: This will only be called if it is select()ed for reading, so
134	* a read() of 0 (or less) means it's disconnected
135	*/
136	#ifndef VBOX_WITH_SLIRP_BSD_SBUF
137	int
138	soread(PNATState pData, struct socket *so)
139	{
140	int n, nn, lss, total;
141	struct sbuf *sb = &so->so_snd;
142	size_t len = sb->sb_datalen - sb->sb_cc;
143	struct iovec iov[2];
144	int mss = so->so_tcpcb->t_maxseg;
145
146	STAM_PROFILE_START(&pData->StatIOread, a);
147	STAM_COUNTER_RESET(&pData->StatIORead_in_1);
148	STAM_COUNTER_RESET(&pData->StatIORead_in_2);
149
150	QSOCKET_LOCK(tcb);
151	SOCKET_LOCK(so);
152	QSOCKET_UNLOCK(tcb);
153
154	LogFlow(("soread: so = %lx\n", (long)so));
155
156	/*
157	* No need to check if there's enough room to read.
158	* soread wouldn't have been called if there weren't
159	*/
160
161	len = sb->sb_datalen - sb->sb_cc;
162
163	iov[0].iov_base = sb->sb_wptr;
164	iov[1].iov_base = 0;
165	iov[1].iov_len = 0;
166	if (sb->sb_wptr < sb->sb_rptr)
167	{
168	iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
169	/* Should never succeed, but... */
170	if (iov[0].iov_len > len)
171	iov[0].iov_len = len;
172	if (iov[0].iov_len > mss)
173	iov[0].iov_len -= iov[0].iov_len%mss;
174	n = 1;
175	}
176	else
177	{
178	iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
179	/* Should never succeed, but... */
180	if (iov[0].iov_len > len)
181	iov[0].iov_len = len;
182	len -= iov[0].iov_len;
183	if (len)
184	{
185	iov[1].iov_base = sb->sb_data;
186	iov[1].iov_len = sb->sb_rptr - sb->sb_data;
187	if (iov[1].iov_len > len)
188	iov[1].iov_len = len;
189	total = iov[0].iov_len + iov[1].iov_len;
190	if (total > mss)
191	{
192	lss = total % mss;
193	if (iov[1].iov_len > lss)
194	{
195	iov[1].iov_len -= lss;
196	n = 2;
197	}
198	else
199	{
200	lss -= iov[1].iov_len;
201	iov[0].iov_len -= lss;
202	n = 1;
203	}
204	}
205	else
206	n = 2;
207	}
208	else
209	{
210	if (iov[0].iov_len > mss)
211	iov[0].iov_len -= iov[0].iov_len%mss;
212	n = 1;
213	}
214	}
215
216	#ifdef HAVE_READV
217	nn = readv(so->s, (struct iovec *)iov, n);
218	Log2((" ... read nn = %d bytes\n", nn));
219	#else
220	nn = recv(so->s, iov[0].iov_base, iov[0].iov_len, (so->so_tcpcb->t_force? MSG_OOB:0));
221	#endif
222	if (nn <= 0)
223	{
224	/*
225	* Special case for WSAEnumNetworkEvents: If we receive 0 bytes that
226	* _could_ mean that the connection is closed. But we will receive an
227	* FD_CLOSE event later if the connection was _really_ closed. With
228	* www.youtube.com I see this very often. Closing the socket too early
229	* would be dangerous.
230	*/
231	int status;
232	unsigned long pending = 0;
233	status = ioctlsocket(so->s, FIONREAD, &pending);
234	if (status < 0)
235	Log(("NAT:error in WSAIoctl: %d\n", errno));
236	if (nn == 0 && (pending != 0))
237	{
238	SOCKET_UNLOCK(so);
239	STAM_PROFILE_STOP(&pData->StatIOread, a);
240	return 0;
241	}
242	if ( nn < 0
243	&& ( errno == EINTR
244	\|\| errno == EAGAIN
245	\|\| errno == EWOULDBLOCK))
246	{
247	SOCKET_UNLOCK(so);
248	STAM_PROFILE_STOP(&pData->StatIOread, a);
249	return 0;
250	}
251	else
252	{
253	/* nn == 0 means peer has performed an orderly shutdown */
254	Log2((" --- soread() disconnected, nn = %d, errno = %d (%s)\n",
255	nn, errno, strerror(errno)));
256	sofcantrcvmore(so);
257	tcp_sockclosed(pData, sototcpcb(so));
258	SOCKET_UNLOCK(so);
259	STAM_PROFILE_STOP(&pData->StatIOread, a);
260	return -1;
261	}
262	}
263	STAM_STATS(
264	if (n == 1)
265	{
266	STAM_COUNTER_INC(&pData->StatIORead_in_1);
267	STAM_COUNTER_ADD(&pData->StatIORead_in_1_bytes, nn);
268	}
269	else
270	{
271	STAM_COUNTER_INC(&pData->StatIORead_in_2);
272	STAM_COUNTER_ADD(&pData->StatIORead_in_2_1st_bytes, nn);
273	}
274	);
275
276	#ifndef HAVE_READV
277	/*
278	* If there was no error, try and read the second time round
279	* We read again if n = 2 (ie, there's another part of the buffer)
280	* and we read as much as we could in the first read
281	* We don't test for <= 0 this time, because there legitimately
282	* might not be any more data (since the socket is non-blocking),
283	* a close will be detected on next iteration.
284	* A return of -1 wont (shouldn't) happen, since it didn't happen above
285	*/
286	if (n == 2 && nn == iov[0].iov_len)
287	{
288	int ret;
289	ret = recv(so->s, iov[1].iov_base, iov[1].iov_len, 0);
290	if (ret > 0)
291	nn += ret;
292	STAM_STATS(
293	if (ret > 0)
294	{
295	STAM_COUNTER_INC(&pData->StatIORead_in_2);
296	STAM_COUNTER_ADD(&pData->StatIORead_in_2_2nd_bytes, ret);
297	}
298	);
299	}
300
301	Log2((" ... read nn = %d bytes\n", nn));
302	#endif
303
304	/* Update fields */
305	sb->sb_cc += nn;
306	sb->sb_wptr += nn;
307	if (sb->sb_wptr >= (sb->sb_data + sb->sb_datalen))
308	sb->sb_wptr -= sb->sb_datalen;
309	STAM_PROFILE_STOP(&pData->StatIOread, a);
310	SOCKET_UNLOCK(so);
311	return nn;
312	}
313	#else /* VBOX_WITH_SLIRP_BSD_SBUF */
314	int
315	soread(PNATState pData, struct socket *so)
316	{
317	int n;
318	char *buf;
319	struct sbuf *sb = &so->so_snd;
320	size_t len = sbspace(sb);
321	int mss = so->so_tcpcb->t_maxseg;
322
323	STAM_PROFILE_START(&pData->StatIOread, a);
324	STAM_COUNTER_RESET(&pData->StatIORead_in_1);
325	STAM_COUNTER_RESET(&pData->StatIORead_in_2);
326
327	QSOCKET_LOCK(tcb);
328	SOCKET_LOCK(so);
329	QSOCKET_UNLOCK(tcb);
330
331	LogFlow(("soread: so = %lx\n", (long)so));
332
333	if (len > mss)
334	len -= len % mss;
335	buf = RTMemAlloc(len);
336	if (buf == NULL)
337	{
338	Log(("NAT: can't alloc enough memory\n"));
339	return -1;
340	}
341
342	n = recv(so->s, buf, len, (so->so_tcpcb->t_force? MSG_OOB:0));
343	if (n <= 0)
344	{
345	/*
346	* Special case for WSAEnumNetworkEvents: If we receive 0 bytes that
347	* _could_ mean that the connection is closed. But we will receive an
348	* FD_CLOSE event later if the connection was _really_ closed. With
349	* www.youtube.com I see this very often. Closing the socket too early
350	* would be dangerous.
351	*/
352	int status;
353	unsigned long pending = 0;
354	status = ioctlsocket(so->s, FIONREAD, &pending);
355	if (status < 0)
356	Log(("NAT:error in WSAIoctl: %d\n", errno));
357	if (n == 0 && (pending != 0))
358	{
359	SOCKET_UNLOCK(so);
360	STAM_PROFILE_STOP(&pData->StatIOread, a);
361	RTMemFree(buf);
362	return 0;
363	}
364	if ( n < 0
365	&& ( errno == EINTR
366	\|\| errno == EAGAIN
367	\|\| errno == EWOULDBLOCK))
368	{
369	SOCKET_UNLOCK(so);
370	STAM_PROFILE_STOP(&pData->StatIOread, a);
371	RTMemFree(buf);
372	return 0;
373	}
374	else
375	{
376	Log2((" --- soread() disconnected, n = %d, errno = %d (%s)\n",
377	n, errno, strerror(errno)));
378	sofcantrcvmore(so);
379	tcp_sockclosed(pData, sototcpcb(so));
380	SOCKET_UNLOCK(so);
381	STAM_PROFILE_STOP(&pData->StatIOread, a);
382	RTMemFree(buf);
383	return -1;
384	}
385	}
386
387	sbuf_bcat(sb, buf, n);
388	RTMemFree(buf);
389	return n;
390	}
391	#endif
392
393	/*
394	* Get urgent data
395	*
396	* When the socket is created, we set it SO_OOBINLINE,
397	* so when OOB data arrives, we soread() it and everything
398	* in the send buffer is sent as urgent data
399	*/
400	void
401	sorecvoob(PNATState pData, struct socket *so)
402	{
403	struct tcpcb *tp = sototcpcb(so);
404	ssize_t ret;
405
406	LogFlow(("sorecvoob: so = %lx\n", (long)so));
407
408	/*
409	* We take a guess at how much urgent data has arrived.
410	* In most situations, when urgent data arrives, the next
411	* read() should get all the urgent data. This guess will
412	* be wrong however if more data arrives just after the
413	* urgent data, or the read() doesn't return all the
414	* urgent data.
415	*/
416	ret = soread(pData, so);
417	tp->snd_up = tp->snd_una + SBUF_LEN(&so->so_snd);
418	tp->t_force = 1;
419	tcp_output(pData, tp);
420	tp->t_force = 0;
421	}
422	#ifndef VBOX_WITH_SLIRP_BSD_SBUF
423	/*
424	* Send urgent data
425	* There's a lot duplicated code here, but...
426	*/
427	int
428	sosendoob(struct socket *so)
429	{
430	struct sbuf *sb = &so->so_rcv;
431	char buff[2048]; /* XXX Shouldn't be sending more oob data than this */
432
433	int n, len;
434
435	LogFlow(("sosendoob so = %lx\n", (long)so));
436
437	if (so->so_urgc > sizeof(buff))
438	so->so_urgc = sizeof(buff); /* XXX */
439
440	if (sb->sb_rptr < sb->sb_wptr)
441	{
442	/* We can send it directly */
443	n = send(so->s, sb->sb_rptr, so->so_urgc, (MSG_OOB)); /* \|MSG_DONTWAIT)); */
444	so->so_urgc -= n;
445
446	Log2((" --- sent %d bytes urgent data, %d urgent bytes left\n",
447	n, so->so_urgc));
448	}
449	else
450	{
451	/*
452	* Since there's no sendv or sendtov like writev,
453	* we must copy all data to a linear buffer then
454	* send it all
455	*/
456	len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
457	if (len > so->so_urgc)
458	len = so->so_urgc;
459	memcpy(buff, sb->sb_rptr, len);
460	so->so_urgc -= len;
461	if (so->so_urgc)
462	{
463	n = sb->sb_wptr - sb->sb_data;
464	if (n > so->so_urgc)
465	n = so->so_urgc;
466	memcpy(buff + len, sb->sb_data, n);
467	so->so_urgc -= n;
468	len += n;
469	}
470	n = send(so->s, buff, len, (MSG_OOB)); /* \|MSG_DONTWAIT)); */
471	#ifdef DEBUG
472	if (n != len)
473	Log(("Didn't send all data urgently XXXXX\n"));
474	#endif
475	Log2((" ---2 sent %d bytes urgent data, %d urgent bytes left\n",
476	n, so->so_urgc));
477	}
478
479	sb->sb_cc -= n;
480	sb->sb_rptr += n;
481	if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
482	sb->sb_rptr -= sb->sb_datalen;
483
484	return n;
485	}
486
487	/*
488	* Write data from so_rcv to so's socket,
489	* updating all sbuf field as necessary
490	*/
491	int
492	sowrite(PNATState pData, struct socket *so)
493	{
494	int n, nn;
495	struct sbuf *sb = &so->so_rcv;
496	size_t len = sb->sb_cc;
497	struct iovec iov[2];
498
499	STAM_PROFILE_START(&pData->StatIOwrite, a);
500	STAM_COUNTER_RESET(&pData->StatIOWrite_in_1);
501	STAM_COUNTER_RESET(&pData->StatIOWrite_in_1_bytes);
502	STAM_COUNTER_RESET(&pData->StatIOWrite_in_2);
503	STAM_COUNTER_RESET(&pData->StatIOWrite_in_2_1st_bytes);
504	STAM_COUNTER_RESET(&pData->StatIOWrite_in_2_2nd_bytes);
505	STAM_COUNTER_RESET(&pData->StatIOWrite_no_w);
506	STAM_COUNTER_RESET(&pData->StatIOWrite_rest);
507	STAM_COUNTER_RESET(&pData->StatIOWrite_rest_bytes);
508	LogFlow(("sowrite: so = %lx\n", (long)so));
509	QSOCKET_LOCK(tcb);
510	SOCKET_LOCK(so);
511	QSOCKET_UNLOCK(tcb);
512	if (so->so_urgc)
513	{
514	sosendoob(so);
515	if (sb->sb_cc == 0)
516	{
517	SOCKET_UNLOCK(so);
518	STAM_PROFILE_STOP(&pData->StatIOwrite, a);
519	return 0;
520	}
521	}
522
523	/*
524	* No need to check if there's something to write,
525	* sowrite wouldn't have been called otherwise
526	*/
527
528	len = sb->sb_cc;
529
530	iov[0].iov_base = sb->sb_rptr;
531	iov[1].iov_base = 0;
532	iov[1].iov_len = 0;
533	if (sb->sb_rptr < sb->sb_wptr)
534	{
535	iov[0].iov_len = sb->sb_wptr - sb->sb_rptr;
536	/* Should never succeed, but... */
537	if (iov[0].iov_len > len)
538	iov[0].iov_len = len;
539	n = 1;
540	}
541	else
542	{
543	iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_rptr;
544	if (iov[0].iov_len > len)
545	iov[0].iov_len = len;
546	len -= iov[0].iov_len;
547	if (len)
548	{
549	iov[1].iov_base = sb->sb_data;
550	iov[1].iov_len = sb->sb_wptr - sb->sb_data;
551	if (iov[1].iov_len > len)
552	iov[1].iov_len = len;
553	n = 2;
554	}
555	else
556	n = 1;
557	}
558	STAM_STATS({
559	if (n == 1)
560	{
561	STAM_COUNTER_INC(&pData->StatIOWrite_in_1);
562	STAM_COUNTER_ADD(&pData->StatIOWrite_in_1_bytes, iov[0].iov_len);
563	}
564	else
565	{
566	STAM_COUNTER_INC(&pData->StatIOWrite_in_2);
567	STAM_COUNTER_ADD(&pData->StatIOWrite_in_2_1st_bytes, iov[0].iov_len);
568	STAM_COUNTER_ADD(&pData->StatIOWrite_in_2_2nd_bytes, iov[1].iov_len);
569	}
570	});
571	/* Check if there's urgent data to send, and if so, send it */
572	#ifdef HAVE_READV
573	nn = writev(so->s, (const struct iovec *)iov, n);
574	Log2((" ... wrote nn = %d bytes\n", nn));
575	#else
576	nn = send(so->s, iov[0].iov_base, iov[0].iov_len, 0);
577	#endif
578	/* This should never happen, but people tell me it does shrug */
579	if ( nn < 0
580	&& ( errno == EAGAIN
581	\|\| errno == EINTR
582	\|\| errno == EWOULDBLOCK))
583	{
584	SOCKET_UNLOCK(so);
585	STAM_PROFILE_STOP(&pData->StatIOwrite, a);
586	return 0;
587	}
588
589	if (nn < 0 \|\| (nn == 0 && iov[0].iov_len > 0))
590	{
591	Log2((" --- sowrite disconnected, so->so_state = %x, errno = %d\n",
592	so->so_state, errno));
593	sofcantsendmore(so);
594	tcp_sockclosed(pData, sototcpcb(so));
595	SOCKET_UNLOCK(so);
596	STAM_PROFILE_STOP(&pData->StatIOwrite, a);
597	return -1;
598	}
599
600	#ifndef HAVE_READV
601	if (n == 2 && nn == iov[0].iov_len)
602	{
603	int ret;
604	ret = send(so->s, iov[1].iov_base, iov[1].iov_len, 0);
605	if (ret > 0)
606	nn += ret;
607	STAM_STATS({
608	if (ret > 0 && ret != iov[1].iov_len)
609	{
610	STAM_COUNTER_INC(&pData->StatIOWrite_rest);
611	STAM_COUNTER_ADD(&pData->StatIOWrite_rest_bytes, (iov[1].iov_len - ret));
612	}
613	});
614	}
615	Log2((" ... wrote nn = %d bytes\n", nn));
616	#endif
617
618	/* Update sbuf */
619	sb->sb_cc -= nn;
620	sb->sb_rptr += nn;
621	if (sb->sb_rptr >= (sb->sb_data + sb->sb_datalen))
622	sb->sb_rptr -= sb->sb_datalen;
623
624	/*
625	* If in DRAIN mode, and there's no more data, set
626	* it CANTSENDMORE
627	*/
628	if ((so->so_state & SS_FWDRAIN) && sb->sb_cc == 0)
629	sofcantsendmore(so);
630
631	SOCKET_UNLOCK(so);
632	STAM_PROFILE_STOP(&pData->StatIOwrite, a);
633	return nn;
634	}
635	#else /* VBOX_WITH_SLIRP_BSD_SBUF */
636	static int
637	do_sosend(struct socket *so, int fUrg)
638	{
639	struct sbuf *sb = &so->so_rcv;
640
641	int n, len;
642
643	LogFlow(("sosendoob: so = %lx\n", (long)so));
644
645	len = sbuf_len(sb);
646
647	n = send(so->s, sbuf_data(sb), len, (fUrg ? MSG_OOB : 0));
648	if (n < 0)
649	Log(("NAT: Can't sent sbuf via socket.\n"));
650	if (fUrg)
651	so->so_urgc -= n;
652	if (n > 0 && n < len)
653	{
654	char *ptr;
655	char *buff;
656	buff = RTMemAlloc(len);
657	if (buff == NULL)
658	{
659	Log(("NAT: No space to allocate temporal buffer\n"));
660	return -1;
661	}
662	ptr = sbuf_data(sb);
663	memcpy(buff, &ptr[n], len - n);
664	sbuf_bcpy(sb, buff, len - n);
665	RTMemFree(buff);
666	return n;
667	}
668	sbuf_clear(sb);
669	return n;
670	}
671	int
672	sosendoob(struct socket *so)
673	{
674	return do_sosend(so, 1);
675	}
676
677	/*
678	* Write data from so_rcv to so's socket,
679	* updating all sbuf field as necessary
680	*/
681	int
682	sowrite(PNATState pData, struct socket *so)
683	{
684	return do_sosend(so, 0);
685	}
686	#endif
687
688	/*
689	* recvfrom() a UDP socket
690	*/
691	void
692	sorecvfrom(PNATState pData, struct socket *so)
693	{
694	ssize_t ret = 0;
695	struct sockaddr_in addr;
696	socklen_t addrlen = sizeof(struct sockaddr_in);
697
698	LogFlow(("sorecvfrom: so = %lx\n", (long)so));
699
700	if (so->so_type == IPPROTO_ICMP)
701	{
702	/* This is a "ping" reply */
703	#ifdef RT_OS_WINDOWS
704	sorecvfrom_icmp_win(pData, so);
705	#else /* RT_OS_WINDOWS */
706	sorecvfrom_icmp_unix(pData, so);
707	#endif /* !RT_OS_WINDOWS */
708	udp_detach(pData, so);
709	}
710	else
711	{
712	/* A "normal" UDP packet */
713	struct mbuf *m;
714	ssize_t len;
715	u_long n = 0;
716	int size;
717	int rc = 0;
718	static int signalled = 0;
719	char *pchBuffer = NULL;
720	bool fWithTemporalBuffer = false;
721
722	QSOCKET_LOCK(udb);
723	SOCKET_LOCK(so);
724	QSOCKET_UNLOCK(udb);
725
726	/How many data has been received ?/
727	/*
728	* 1. calculate how much we can read
729	* 2. read as much as possible
730	* 3. attach buffer to allocated header mbuf
731	*/
732	rc = ioctlsocket(so->s, FIONREAD, &n);
733	if (rc == -1)
734	{
735	if ( errno == EAGAIN
736	\|\| errno == EWOULDBLOCK
737	\|\| errno == EINPROGRESS
738	\|\| errno == ENOTCONN)
739	return;
740	else if (signalled == 0)
741	{
742	LogRel(("NAT: can't fetch amount of bytes on socket %R[natsock], so message will be truncated.\n", so));
743	signalled = 1;
744	}
745	return;
746	}
747
748	len = sizeof(struct udpiphdr);
749	m = m_getjcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR, slirp_size(pData));
750	if (m == NULL)
751	return;
752
753	len += n;
754	m->m_data += ETH_HLEN;
755	m->m_pkthdr.header = mtod(m, void *);
756	m->m_data += sizeof(struct udpiphdr);
757
758	pchBuffer = mtod(m, char *);
759	fWithTemporalBuffer = false;
760	/*
761	* Even if amounts of bytes on socket is greater than MTU value
762	* Slirp will able fragment it, but we won't create temporal location
763	* here.
764	*/
765	if (n > (slirp_size(pData) - sizeof(struct udpiphdr)))
766	{
767	pchBuffer = RTMemAlloc((n) * sizeof(char));
768	if (!pchBuffer)
769	{
770	m_freem(pData, m);
771	return;
772	}
773	fWithTemporalBuffer = true;
774	}
775	ret = recvfrom(so->s, pchBuffer, n, 0,
776	(struct sockaddr *)&addr, &addrlen);
777	if (fWithTemporalBuffer)
778	{
779	if (ret > 0)
780	{
781	m_copyback(pData, m, 0, ret, pchBuffer);
782	/*
783	* If we've met comporison below our size prediction was failed
784	* it's not fatal just we've allocated for nothing. (@todo add counter here
785	* to calculate how rare we here)
786	*/
787	if(ret < slirp_size(pData) && !m->m_next)
788	Log(("NAT:udp: Expected size(%d) lesser than real(%d) and less minimal mbuf size(%d)\n",
789	n, ret, slirp_size(pData)));
790	}
791	/* we're freeing buffer anyway */
792	RTMemFree(pchBuffer);
793	}
794	else
795	m->m_len = ret;
796
797	if (ret < 0)
798	{
799	u_char code = ICMP_UNREACH_PORT;
800
801	if (errno == EHOSTUNREACH)
802	code = ICMP_UNREACH_HOST;
803	else if (errno == ENETUNREACH)
804	code = ICMP_UNREACH_NET;
805
806	m_freem(pData, m);
807	if ( errno == EAGAIN
808	\|\| errno == EWOULDBLOCK
809	\|\| errno == EINPROGRESS
810	\|\| errno == ENOTCONN)
811	{
812	return;
813	}
814
815	Log2((" rx error, tx icmp ICMP_UNREACH:%i\n", code));
816	icmp_error(pData, so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
817	so->so_m = NULL;
818	}
819	else
820	{
821	Assert((m_length(m,NULL) == ret));
822	/*
823	* Hack: domain name lookup will be used the most for UDP,
824	* and since they'll only be used once there's no need
825	* for the 4 minute (or whatever) timeout... So we time them
826	* out much quicker (10 seconds for now...)
827	*/
828	if (so->so_expire)
829	{
830	if (so->so_fport != RT_H2N_U16_C(53))
831	so->so_expire = curtime + SO_EXPIRE;
832	}
833	/*
834	* last argument should be changed if Slirp will inject IP attributes
835	* Note: Here we can't check if dnsproxy's sent initial request
836	*/
837	if ( pData->fUseDnsProxy
838	&& so->so_fport == RT_H2N_U16_C(53))
839	dnsproxy_answer(pData, so, m);
840
841	#if 0
842	if (m->m_len == len)
843	{
844	m_inc(m, MINCSIZE);
845	m->m_len = 0;
846	}
847	#endif
848
849	/*
850	* If this packet was destined for CTL_ADDR,
851	* make it look like that's where it came from, done by udp_output
852	*/
853	udp_output(pData, so, m, &addr);
854	SOCKET_UNLOCK(so);
855	} /* rx error */
856	} /* if ping packet */
857	}
858
859	/*
860	* sendto() a socket
861	*/
862	int
863	sosendto(PNATState pData, struct socket so, struct mbuf m)
864	{
865	int ret;
866	struct sockaddr_in *paddr;
867	struct sockaddr addr;
868	#if 0
869	struct sockaddr_in host_addr;
870	#endif
871	caddr_t buf = 0;
872	int mlen;
873
874	LogFlow(("sosendto: so = %lx, m = %lx\n", (long)so, (long)m));
875
876	memset(&addr, 0, sizeof(struct sockaddr));
877	#ifdef RT_OS_DARWIN
878	addr.sa_len = sizeof(struct sockaddr_in);
879	#endif
880	paddr = (struct sockaddr_in *)&addr;
881	paddr->sin_family = AF_INET;
882	if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
883	{
884	/* It's an alias */
885	uint32_t last_byte = RT_N2H_U32(so->so_faddr.s_addr) & ~pData->netmask;
886	switch(last_byte)
887	{
888	#if 0
889	/* handle this case at 'default:' */
890	case CTL_BROADCAST:
891	addr.sin_addr.s_addr = INADDR_BROADCAST;
892	/* Send the packet to host to fully emulate broadcast */
893	/** @todo r=klaus: on Linux host this causes the host to receive
894	* the packet twice for some reason. And I cannot find any place
895	* in the man pages which states that sending a broadcast does not
896	* reach the host itself. */
897	host_addr.sin_family = AF_INET;
898	host_addr.sin_port = so->so_fport;
899	host_addr.sin_addr = our_addr;
900	sendto(so->s, m->m_data, m->m_len, 0,
901	(struct sockaddr *)&host_addr, sizeof (struct sockaddr));
902	break;
903	#endif
904	case CTL_DNS:
905	case CTL_ALIAS:
906	default:
907	if (last_byte == ~pData->netmask)
908	paddr->sin_addr.s_addr = INADDR_BROADCAST;
909	else
910	paddr->sin_addr = loopback_addr;
911	break;
912	}
913	}
914	else
915	paddr->sin_addr = so->so_faddr;
916	paddr->sin_port = so->so_fport;
917
918	Log2((" sendto()ing, addr.sin_port=%d, addr.sin_addr.s_addr=%.16s\n",
919	RT_N2H_U16(paddr->sin_port), inet_ntoa(paddr->sin_addr)));
920
921	/* Don't care what port we get */
922	/*
923	* > nmap -sV -T4 -O -A -v -PU3483 255.255.255.255
924	* generates bodyless messages, annoying memmory management system.
925	*/
926	mlen = m_length(m, NULL);
927	if (mlen > 0)
928	{
929	buf = RTMemAlloc(mlen);
930	if (buf == NULL)
931	{
932	return -1;
933	}
934	m_copydata(m, 0, mlen, buf);
935	}
936	ret = sendto(so->s, buf, mlen, 0,
937	(struct sockaddr *)&addr, sizeof (struct sockaddr));
938	if (buf)
939	RTMemFree(buf);
940	if (ret < 0)
941	{
942	Log2(("UDP: sendto fails (%s)\n", strerror(errno)));
943	return -1;
944	}
945
946	/*
947	* Kill the socket if there's no reply in 4 minutes,
948	* but only if it's an expirable socket
949	*/
950	if (so->so_expire)
951	so->so_expire = curtime + SO_EXPIRE;
952	so->so_state = SS_ISFCONNECTED; /* So that it gets select()ed */
953	return 0;
954	}
955
956	/*
957	* XXX This should really be tcp_listen
958	*/
959	struct socket *
960	solisten(PNATState pData, u_int32_t bind_addr, u_int port, u_int32_t laddr, u_int lport, int flags)
961	{
962	struct sockaddr_in addr;
963	struct socket *so;
964	socklen_t addrlen = sizeof(addr);
965	int s, opt = 1;
966	int status;
967
968	LogFlow(("solisten: port = %d, laddr = %x, lport = %d, flags = %x\n", port, laddr, lport, flags));
969
970	if ((so = socreate()) == NULL)
971	{
972	/* RTMemFree(so); Not sofree() ??? free(NULL) == NOP */
973	return NULL;
974	}
975
976	/* Don't tcp_attach... we don't need so_snd nor so_rcv */
977	if ((so->so_tcpcb = tcp_newtcpcb(pData, so)) == NULL)
978	{
979	RTMemFree(so);
980	return NULL;
981	}
982
983	SOCKET_LOCK_CREATE(so);
984	SOCKET_LOCK(so);
985	QSOCKET_LOCK(tcb);
986	insque(pData, so,&tcb);
987	NSOCK_INC();
988	QSOCKET_UNLOCK(tcb);
989
990	/*
991	* SS_FACCEPTONCE sockets must time out.
992	*/
993	if (flags & SS_FACCEPTONCE)
994	so->so_tcpcb->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT*2;
995
996	so->so_state = (SS_FACCEPTCONN\|flags);
997	so->so_lport = lport; /* Kept in network format */
998	so->so_laddr.s_addr = laddr; /* Ditto */
999
1000	memset(&addr, 0, sizeof(addr));
1001	#ifdef RT_OS_DARWIN
1002	addr.sin_len = sizeof(addr);
1003	#endif
1004	addr.sin_family = AF_INET;
1005	addr.sin_addr.s_addr = bind_addr;
1006	addr.sin_port = port;
1007
1008	if ( ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0)
1009	\|\| (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,(char *)&opt, sizeof(int)) < 0)
1010	\|\| (bind(s,(struct sockaddr *)&addr, sizeof(addr)) < 0)
1011	\|\| (listen(s, 1) < 0))
1012	{
1013	#ifdef RT_OS_WINDOWS
1014	int tmperrno = WSAGetLastError(); /* Don't clobber the real reason we failed */
1015	closesocket(s);
1016	QSOCKET_LOCK(tcb);
1017	sofree(pData, so);
1018	QSOCKET_UNLOCK(tcb);
1019	/* Restore the real errno */
1020	WSASetLastError(tmperrno);
1021	#else
1022	int tmperrno = errno; /* Don't clobber the real reason we failed */
1023	close(s);
1024	QSOCKET_LOCK(tcb);
1025	sofree(pData, so);
1026	QSOCKET_UNLOCK(tcb);
1027	/* Restore the real errno */
1028	errno = tmperrno;
1029	#endif
1030	return NULL;
1031	}
1032	fd_nonblock(s);
1033	setsockopt(s, SOL_SOCKET, SO_OOBINLINE,(char *)&opt, sizeof(int));
1034
1035	getsockname(s,(struct sockaddr *)&addr,&addrlen);
1036	so->so_fport = addr.sin_port;
1037	/* set socket buffers */
1038	opt = pData->socket_rcv;
1039	status = setsockopt(s, SOL_SOCKET, SO_RCVBUF, (char *)&opt, sizeof(int));
1040	if (status < 0)
1041	{
1042	LogRel(("NAT: Error(%d) while setting RCV capacity to (%d)\n", errno, opt));
1043	goto no_sockopt;
1044	}
1045	opt = pData->socket_snd;
1046	status = setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&opt, sizeof(int));
1047	if (status < 0)
1048	{
1049	LogRel(("NAT: Error(%d) while setting SND capacity to (%d)\n", errno, opt));
1050	goto no_sockopt;
1051	}
1052	no_sockopt:
1053	if (addr.sin_addr.s_addr == 0 \|\| addr.sin_addr.s_addr == loopback_addr.s_addr)
1054	so->so_faddr = alias_addr;
1055	else
1056	so->so_faddr = addr.sin_addr;
1057
1058	so->s = s;
1059	SOCKET_UNLOCK(so);
1060	return so;
1061	}
1062
1063	/*
1064	* Data is available in so_rcv
1065	* Just write() the data to the socket
1066	* XXX not yet...
1067	*/
1068	void
1069	sorwakeup(struct socket *so)
1070	{
1071	#if 0
1072	sowrite(so);
1073	FD_CLR(so->s,&writefds);
1074	#endif
1075	}
1076
1077	/*
1078	* Data has been freed in so_snd
1079	* We have room for a read() if we want to
1080	* For now, don't read, it'll be done in the main loop
1081	*/
1082	void
1083	sowwakeup(struct socket *so)
1084	{
1085	}
1086
1087	/*
1088	* Various session state calls
1089	* XXX Should be #define's
1090	* The socket state stuff needs work, these often get call 2 or 3
1091	* times each when only 1 was needed
1092	*/
1093	void
1094	soisfconnecting(struct socket *so)
1095	{
1096	so->so_state &= ~(SS_NOFDREF\|SS_ISFCONNECTED\|SS_FCANTRCVMORE\|
1097	SS_FCANTSENDMORE\|SS_FWDRAIN);
1098	so->so_state \|= SS_ISFCONNECTING; /* Clobber other states */
1099	}
1100
1101	void
1102	soisfconnected(struct socket *so)
1103	{
1104	so->so_state &= ~(SS_ISFCONNECTING\|SS_FWDRAIN\|SS_NOFDREF);
1105	so->so_state \|= SS_ISFCONNECTED; /* Clobber other states */
1106	}
1107
1108	void
1109	sofcantrcvmore(struct socket *so)
1110	{
1111	if ((so->so_state & SS_NOFDREF) == 0)
1112	{
1113	shutdown(so->s, 0);
1114	}
1115	so->so_state &= ~(SS_ISFCONNECTING);
1116	if (so->so_state & SS_FCANTSENDMORE)
1117	so->so_state = SS_NOFDREF; /* Don't select it */
1118	/* XXX close() here as well? */
1119	else
1120	so->so_state \|= SS_FCANTRCVMORE;
1121	}
1122
1123	void
1124	sofcantsendmore(struct socket *so)
1125	{
1126	if ((so->so_state & SS_NOFDREF) == 0)
1127	shutdown(so->s, 1); /* send FIN to fhost */
1128
1129	so->so_state &= ~(SS_ISFCONNECTING);
1130	if (so->so_state & SS_FCANTRCVMORE)
1131	so->so_state = SS_NOFDREF; /* as above */
1132	else
1133	so->so_state \|= SS_FCANTSENDMORE;
1134	}
1135
1136	void
1137	soisfdisconnected(struct socket *so)
1138	{
1139	#if 0
1140	so->so_state &= ~(SS_ISFCONNECTING\|SS_ISFCONNECTED);
1141	close(so->s);
1142	so->so_state = SS_ISFDISCONNECTED;
1143	/*
1144	* XXX Do nothing ... ?
1145	*/
1146	#endif
1147	}
1148
1149	/*
1150	* Set write drain mode
1151	* Set CANTSENDMORE once all data has been write()n
1152	*/
1153	void
1154	sofwdrain(struct socket *so)
1155	{
1156	if (SBUF_LEN(&so->so_rcv))
1157	so->so_state \|= SS_FWDRAIN;
1158	else
1159	sofcantsendmore(so);
1160	}
1161
1162	static void
1163	send_icmp_to_guest(PNATState pData, char buff, size_t len, struct socket so, const struct sockaddr_in *addr)
1164	{
1165	struct ip *ip;
1166	uint32_t dst, src;
1167	char ip_copy[256];
1168	struct icmp *icp;
1169	int old_ip_len = 0;
1170	int hlen, original_hlen = 0;
1171	struct mbuf *m;
1172	struct icmp_msg *icm;
1173	uint8_t proto;
1174	int type = 0;
1175
1176	ip = (struct ip *)buff;
1177	/* Fix ip->ip_len to contain the total packet length including the header
1178	* in _host_ byte order for all OSes. On Darwin, that value already is in
1179	* host byte order. Solaris and Darwin report only the payload. */
1180	#ifndef RT_OS_DARWIN
1181	ip->ip_len = RT_N2H_U16(ip->ip_len);
1182	#endif
1183	hlen = (ip->ip_hl << 2);
1184	#if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_DARWIN)
1185	ip->ip_len += hlen;
1186	#endif
1187	if (ip->ip_len < hlen + ICMP_MINLEN)
1188	{
1189	Log(("send_icmp_to_guest: ICMP header is too small to understand which type/subtype of the datagram\n"));
1190	return;
1191	}
1192	icp = (struct icmp )((char )ip + hlen);
1193
1194	Log(("ICMP:received msg(t:%d, c:%d)\n", icp->icmp_type, icp->icmp_code));
1195	if ( icp->icmp_type != ICMP_ECHOREPLY
1196	&& icp->icmp_type != ICMP_TIMXCEED
1197	&& icp->icmp_type != ICMP_UNREACH)
1198	{
1199	return;
1200	}
1201
1202	/*
1203	* ICMP_ECHOREPLY, ICMP_TIMXCEED, ICMP_UNREACH minimal header size is
1204	* ICMP_ECHOREPLY assuming data 0
1205	* icmp_{type(8), code(8), cksum(16),identifier(16),seqnum(16)}
1206	*/
1207	if (ip->ip_len < hlen + 8)
1208	{
1209	Log(("send_icmp_to_guest: NAT accept ICMP_{ECHOREPLY, TIMXCEED, UNREACH} the minimum size is 64 (see rfc792)\n"));
1210	return;
1211	}
1212
1213	type = icp->icmp_type;
1214	if ( type == ICMP_TIMXCEED
1215	\|\| type == ICMP_UNREACH)
1216	{
1217	/*
1218	* ICMP_TIMXCEED, ICMP_UNREACH minimal header size is
1219	* icmp_{type(8), code(8), cksum(16),unused(32)} + IP header + 64 bit of original datagram
1220	*/
1221	if (ip->ip_len < hlen + 2*8 + sizeof(struct ip))
1222	{
1223	Log(("send_icmp_to_guest: NAT accept ICMP_{TIMXCEED, UNREACH} the minimum size of ipheader + 64 bit of data (see rfc792)\n"));
1224	return;
1225	}
1226	ip = &icp->icmp_ip;
1227	}
1228
1229	icm = icmp_find_original_mbuf(pData, ip);
1230	if (icm == NULL)
1231	{
1232	Log(("NAT: Can't find the corresponding packet for the received ICMP\n"));
1233	return;
1234	}
1235
1236	m = icm->im_m;
1237	Assert(m != NULL);
1238
1239	src = addr->sin_addr.s_addr;
1240	if (type == ICMP_ECHOREPLY)
1241	{
1242	struct ip ip0 = mtod(m, struct ip );
1243	struct icmp icp0 = (struct icmp )((char *)ip0 + (ip0->ip_hl << 2));
1244	if (icp0->icmp_type != ICMP_ECHO)
1245	{
1246	Log(("NAT: we haven't found echo for this reply\n"));
1247	return;
1248	}
1249	/*
1250	* while combining buffer to send (see ip_icmp.c) we control ICMP header only,
1251	* IP header combined by OS network stack, our local copy of IP header contians values
1252	* in host byte order so no byte order conversion is required. IP headers fields are converting
1253	* in ip_output0 routine only.
1254	*/
1255	if ( (ip->ip_len - hlen)
1256	!= (ip0->ip_len - (ip0->ip_hl << 2)))
1257	{
1258	Log(("NAT: ECHO(%d) lenght doesn't match ECHOREPLY(%d)\n",
1259	(ip->ip_len - hlen), (ip0->ip_len - (ip0->ip_hl << 2))));
1260	return;
1261	}
1262	}
1263
1264	/* ip points on origianal ip header */
1265	ip = mtod(m, struct ip *);
1266	proto = ip->ip_p;
1267	/* Now ip is pointing on header we've sent from guest */
1268	if ( icp->icmp_type == ICMP_TIMXCEED
1269	\|\| icp->icmp_type == ICMP_UNREACH)
1270	{
1271	old_ip_len = (ip->ip_hl << 2) + 64;
1272	if (old_ip_len > sizeof(ip_copy))
1273	old_ip_len = sizeof(ip_copy);
1274	memcpy(ip_copy, ip, old_ip_len);
1275	}
1276
1277	/* source address from original IP packet*/
1278	dst = ip->ip_src.s_addr;
1279
1280	/* overide ther tail of old packet */
1281	ip = mtod(m, struct ip ); / ip is from mbuf we've overrided */
1282	original_hlen = ip->ip_hl << 2;
1283	/* saves original ip header and options */
1284	m_copyback(pData, m, original_hlen, len - hlen, buff + hlen);
1285	ip->ip_len = m_length(m, NULL);
1286	ip->ip_p = IPPROTO_ICMP; /* the original package could be whatever, but we're response via ICMP*/
1287
1288	icp = (struct icmp )((char )ip + (ip->ip_hl << 2));
1289	type = icp->icmp_type;
1290	if ( type == ICMP_TIMXCEED
1291	\|\| type == ICMP_UNREACH)
1292	{
1293	/* according RFC 793 error messages required copy of initial IP header + 64 bit */
1294	memcpy(&icp->icmp_ip, ip_copy, old_ip_len);
1295	ip->ip_tos = ((ip->ip_tos & 0x1E) \| 0xC0); /* high priority for errors */
1296	}
1297
1298	ip->ip_src.s_addr = src;
1299	ip->ip_dst.s_addr = dst;
1300	icmp_reflect(pData, m);
1301	LIST_REMOVE(icm, im_list);
1302	/* Don't call m_free here*/
1303
1304	if ( type == ICMP_TIMXCEED
1305	\|\| type == ICMP_UNREACH)
1306	{
1307	icm->im_so->so_m = NULL;
1308	switch (proto)
1309	{
1310	case IPPROTO_UDP:
1311	/XXX: so->so_m already freed so we shouldn't call sofree /
1312	udp_detach(pData, icm->im_so);
1313	break;
1314	case IPPROTO_TCP:
1315	/close tcp should be here /
1316	break;
1317	default:
1318	/* do nothing */
1319	break;
1320	}
1321	}
1322	RTMemFree(icm);
1323	}
1324
1325	#ifdef RT_OS_WINDOWS
1326	static void
1327	sorecvfrom_icmp_win(PNATState pData, struct socket *so)
1328	{
1329	int len;
1330	int i;
1331	struct ip *ip;
1332	struct mbuf *m;
1333	struct icmp *icp;
1334	struct icmp_msg *icm;
1335	struct ip ip_broken; / ICMP returns header + 64 bit of packet */
1336	uint32_t src;
1337	ICMP_ECHO_REPLY *icr;
1338	int hlen = 0;
1339	int data_len = 0;
1340	int nbytes = 0;
1341	u_char code = ~0;
1342	int out_len;
1343	int size;
1344
1345	len = pData->pfIcmpParseReplies(pData->pvIcmpBuffer, pData->szIcmpBuffer);
1346	if (len < 0)
1347	{
1348	LogRel(("NAT: Error (%d) occurred on ICMP receiving\n", GetLastError()));
1349	return;
1350	}
1351	if (len == 0)
1352	return; /* no error */
1353
1354	icr = (ICMP_ECHO_REPLY *)pData->pvIcmpBuffer;
1355	for (i = 0; i < len; ++i)
1356	{
1357	switch(icr[i].Status)
1358	{
1359	case IP_DEST_HOST_UNREACHABLE:
1360	code = (code != ~0 ? code : ICMP_UNREACH_HOST);
1361	case IP_DEST_NET_UNREACHABLE:
1362	code = (code != ~0 ? code : ICMP_UNREACH_NET);
1363	case IP_DEST_PROT_UNREACHABLE:
1364	code = (code != ~0 ? code : ICMP_UNREACH_PROTOCOL);
1365	/* UNREACH error inject here */
1366	case IP_DEST_PORT_UNREACHABLE:
1367	code = (code != ~0 ? code : ICMP_UNREACH_PORT);
1368	icmp_error(pData, so->so_m, ICMP_UNREACH, code, 0, "Error occurred!!!");
1369	so->so_m = NULL;
1370	break;
1371	case IP_SUCCESS: /* echo replied */
1372	out_len = ETH_HLEN + sizeof(struct ip) + 8;
1373	size;
1374	size = MCLBYTES;
1375	if (out_len < MSIZE)
1376	size = MCLBYTES;
1377	else if (out_len < MCLBYTES)
1378	size = MCLBYTES;
1379	else if (out_len < MJUM9BYTES)
1380	size = MJUM9BYTES;
1381	else if (out_len < MJUM16BYTES)
1382	size = MJUM16BYTES;
1383	else
1384	AssertMsgFailed(("Unsupported size"));
1385
1386	m = m_getjcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR, size);
1387	if (m == NULL)
1388	return;
1389	m->m_len = 0;
1390	m->m_data += if_maxlinkhdr;
1391	ip = mtod(m, struct ip *);
1392	ip->ip_src.s_addr = icr[i].Address;
1393	ip->ip_p = IPPROTO_ICMP;
1394	ip->ip_dst.s_addr = so->so_laddr.s_addr; /XXX: still the hack/
1395	data_len = sizeof(struct ip);
1396	ip->ip_hl = data_len >> 2; /* requiered for icmp_reflect, no IP options */
1397	ip->ip_ttl = icr[i].Options.Ttl;
1398
1399	icp = (struct icmp )&ip[1]; / no options */
1400	icp->icmp_type = ICMP_ECHOREPLY;
1401	icp->icmp_code = 0;
1402	icp->icmp_id = so->so_icmp_id;
1403	icp->icmp_seq = so->so_icmp_seq;
1404
1405	data_len += ICMP_MINLEN;
1406
1407	hlen = (ip->ip_hl << 2);
1408	m->m_pkthdr.header = mtod(m, void *);
1409	m->m_len = data_len;
1410
1411	m_copyback(pData, m, hlen + 8, icr[i].DataSize, icr[i].Data);
1412
1413	data_len += icr[i].DataSize;
1414
1415	ip->ip_len = data_len;
1416	m->m_len = ip->ip_len;
1417
1418	icmp_reflect(pData, m);
1419	break;
1420	case IP_TTL_EXPIRED_TRANSIT: /* TTL expired */
1421
1422	ip_broken = icr[i].Data;
1423	icm = icmp_find_original_mbuf(pData, ip_broken);
1424	if (icm == NULL) {
1425	Log(("ICMP: can't find original package (first double word %x)\n", (uint32_t )ip_broken));
1426	return;
1427	}
1428	m = icm->im_m;
1429	ip = mtod(m, struct ip *);
1430	ip->ip_ttl = icr[i].Options.Ttl;
1431	src = ip->ip_src.s_addr;
1432	ip->ip_dst.s_addr = src;
1433	ip->ip_dst.s_addr = icr[i].Address;
1434
1435	hlen = (ip->ip_hl << 2);
1436	icp = (struct icmp )((char )ip + hlen);
1437	ip_broken->ip_src.s_addr = src; /it packet sent from host not from guest/
1438	data_len = (ip_broken->ip_hl << 2) + 64;
1439
1440	m->m_len = data_len;
1441	m->m_pkthdr.header = mtod(m, void *);
1442	m_copyback(pData, m, ip->ip_hl >> 2, icr[i].DataSize, icr[i].Data);
1443	icmp_reflect(pData, m);
1444	break;
1445	default:
1446	Log(("ICMP(default): message with Status: %x was received from %x\n", icr[i].Status, icr[i].Address));
1447	break;
1448	}
1449	}
1450	}
1451	#else /* !RT_OS_WINDOWS */
1452	static void sorecvfrom_icmp_unix(PNATState pData, struct socket *so)
1453	{
1454	struct sockaddr_in addr;
1455	socklen_t addrlen = sizeof(struct sockaddr_in);
1456	struct ip ip;
1457	char *buff;
1458	int len = 0;
1459
1460	/* 1- step: read the ip header */
1461	len = recvfrom(so->s, &ip, sizeof(struct ip), MSG_PEEK,
1462	(struct sockaddr *)&addr, &addrlen);
1463	if ( len < 0
1464	&& ( errno == EAGAIN
1465	\|\| errno == EWOULDBLOCK
1466	\|\| errno == EINPROGRESS
1467	\|\| errno == ENOTCONN))
1468	{
1469	Log(("sorecvfrom_icmp_unix: 1 - step can't read IP datagramm (would block)\n"));
1470	return;
1471	}
1472
1473	if ( len < sizeof(struct ip)
1474	\|\| len < 0
1475	\|\| len == 0)
1476	{
1477	u_char code;
1478	code = ICMP_UNREACH_PORT;
1479
1480	if (errno == EHOSTUNREACH)
1481	code = ICMP_UNREACH_HOST;
1482	else if (errno == ENETUNREACH)
1483	code = ICMP_UNREACH_NET;
1484
1485	LogRel((" udp icmp rx errno = %d (%s)\n", errno, strerror(errno)));
1486	icmp_error(pData, so->so_m, ICMP_UNREACH, code, 0, strerror(errno));
1487	so->so_m = NULL;
1488	Log(("sorecvfrom_icmp_unix: 1 - step can't read IP datagramm\n"));
1489	return;
1490	}
1491	/* basic check of IP header */
1492	if ( ip.ip_v != IPVERSION
1493	# ifndef RT_OS_DARWIN
1494	\|\| ip.ip_p != IPPROTO_ICMP
1495	# endif
1496	)
1497	{
1498	Log(("sorecvfrom_icmp_unix: 1 - step IP isn't IPv4\n"));
1499	return;
1500	}
1501	# ifndef RT_OS_DARWIN
1502	/* Darwin reports the IP length already in host byte order. */
1503	ip.ip_len = RT_N2H_U16(ip.ip_len);
1504	# endif
1505	# if defined(RT_OS_SOLARIS) \|\| defined(RT_OS_DARWIN)
1506	/* Solaris and Darwin report the payload only */
1507	ip.ip_len += (ip.ip_hl << 2);
1508	# endif
1509	/* Note: ip->ip_len in host byte order (all OS) */
1510	len = ip.ip_len;
1511	buff = RTMemAlloc(len);
1512	if (buff == NULL)
1513	{
1514	Log(("sorecvfrom_icmp_unix: 1 - step can't allocate enought room for datagram\n"));
1515	return;
1516	}
1517	/* 2 - step: we're reading rest of the datagramm to the buffer */
1518	addrlen = sizeof(struct sockaddr_in);
1519	memset(&addr, 0, addrlen);
1520	len = recvfrom(so->s, buff, len, 0,
1521	(struct sockaddr *)&addr, &addrlen);
1522	if ( len < 0
1523	&& ( errno == EAGAIN
1524	\|\| errno == EWOULDBLOCK
1525	\|\| errno == EINPROGRESS
1526	\|\| errno == ENOTCONN))
1527	{
1528	Log(("sorecvfrom_icmp_unix: 2 - step can't read IP body (would block expected:%d)\n",
1529	ip.ip_len));
1530	RTMemFree(buff);
1531	return;
1532	}
1533	if ( len < 0
1534	\|\| len == 0)
1535	{
1536	Log(("sorecvfrom_icmp_unix: 2 - step read of the rest of datagramm is fallen (errno:%d, len:%d expected: %d)\n",
1537	errno, len, (ip.ip_len - sizeof(struct ip))));
1538	RTMemFree(buff);
1539	return;
1540	}
1541	/* len is modified in 2nd read, when the rest of the datagramm was read */
1542	send_icmp_to_guest(pData, buff, len, so, &addr);
1543	RTMemFree(buff);
1544	}
1545	#endif /* !RT_OS_WINDOWS */

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source: vbox/trunk/src/VBox/Devices/Network/slirp/socket.c@ 37423

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