VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 48150

Last change on this file since 48150 was 48150, checked in by vboxsync, 11 years ago

NAT/slirp: include VBox/vmm/dbgf.h where it required only.
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File size: 63.8 KB
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1/* $Id: slirp.c 48150 2013-08-29 12:41:05Z vboxsync $ */
2/** @file
3 * NAT - slirp glue.
4 */
5
6/*
7 * Copyright (C) 2006-2012 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18/*
19 * This code is based on:
20 *
21 * libslirp glue
22 *
23 * Copyright (c) 2004-2008 Fabrice Bellard
24 *
25 * Permission is hereby granted, free of charge, to any person obtaining a copy
26 * of this software and associated documentation files (the "Software"), to deal
27 * in the Software without restriction, including without limitation the rights
28 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
29 * copies of the Software, and to permit persons to whom the Software is
30 * furnished to do so, subject to the following conditions:
31 *
32 * The above copyright notice and this permission notice shall be included in
33 * all copies or substantial portions of the Software.
34 *
35 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
36 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
37 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
38 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
39 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
40 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
41 * THE SOFTWARE.
42 */
43
44#include "slirp.h"
45#ifdef RT_OS_OS2
46# include <paths.h>
47#endif
48
49#include <VBox/err.h>
50#include <VBox/vmm/dbgf.h>
51#include <VBox/vmm/pdmdrv.h>
52#include <iprt/assert.h>
53#include <iprt/file.h>
54#ifndef RT_OS_WINDOWS
55# include <sys/ioctl.h>
56# include <poll.h>
57# include <netinet/in.h>
58#else
59# include <Winnls.h>
60# define _WINSOCK2API_
61# include <IPHlpApi.h>
62#endif
63#include <alias.h>
64
65#ifndef RT_OS_WINDOWS
66
67# define DO_ENGAGE_EVENT1(so, fdset, label) \
68 do { \
69 if ( so->so_poll_index != -1 \
70 && so->s == polls[so->so_poll_index].fd) \
71 { \
72 polls[so->so_poll_index].events |= N_(fdset ## _poll); \
73 break; \
74 } \
75 AssertRelease(poll_index < (nfds)); \
76 AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
77 polls[poll_index].fd = (so)->s; \
78 (so)->so_poll_index = poll_index; \
79 polls[poll_index].events = N_(fdset ## _poll); \
80 polls[poll_index].revents = 0; \
81 poll_index++; \
82 } while (0)
83
84# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
85 do { \
86 if ( so->so_poll_index != -1 \
87 && so->s == polls[so->so_poll_index].fd) \
88 { \
89 polls[so->so_poll_index].events |= \
90 N_(fdset1 ## _poll) | N_(fdset2 ## _poll); \
91 break; \
92 } \
93 AssertRelease(poll_index < (nfds)); \
94 polls[poll_index].fd = (so)->s; \
95 (so)->so_poll_index = poll_index; \
96 polls[poll_index].events = \
97 N_(fdset1 ## _poll) | N_(fdset2 ## _poll); \
98 poll_index++; \
99 } while (0)
100
101# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
102
103/*
104 * DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
105 * gcc warns about attempts to log POLLNVAL so construction in a last to lines
106 * used to catch POLLNVAL while logging and return false in case of error while
107 * normal usage.
108 */
109# define DO_CHECK_FD_SET(so, events, fdset) \
110 ( ((so)->so_poll_index != -1) \
111 && ((so)->so_poll_index <= ndfs) \
112 && ((so)->s == polls[so->so_poll_index].fd) \
113 && (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
114 && ( N_(fdset ## _poll) == POLLNVAL \
115 || !(polls[(so)->so_poll_index].revents & POLLNVAL)))
116
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# if 0 /* unused yet */
131# define rdhup_poll (POLLHUP)
132# define nval_poll (POLLNVAL)
133# endif
134
135# define ICMP_ENGAGE_EVENT(so, fdset) \
136 do { \
137 if (pData->icmp_socket.s != -1) \
138 DO_ENGAGE_EVENT1((so), fdset, ICMP); \
139 } while (0)
140
141#else /* RT_OS_WINDOWS */
142
143/*
144 * On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
145 * So no call to WSAEventSelect necessary.
146 */
147# define ICMP_ENGAGE_EVENT(so, fdset) do {} while (0)
148
149/*
150 * On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
151 */
152# define DO_ENGAGE_EVENT1(so, fdset1, label) \
153 do { \
154 rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
155 if (rc == SOCKET_ERROR) \
156 { \
157 /* This should not happen */ \
158 error = WSAGetLastError(); \
159 LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
160 error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
161 } \
162 } while (0); \
163 CONTINUE(label)
164
165# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
166 DO_ENGAGE_EVENT1((so), (fdset1), label)
167
168# define DO_POLL_EVENTS(rc, error, so, events, label) \
169 (rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
170 if ((rc) == SOCKET_ERROR) \
171 { \
172 (error) = WSAGetLastError(); \
173 LogRel(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
174 LogFunc(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (error))); \
175 CONTINUE(label); \
176 }
177
178# define acceptds_win FD_ACCEPT
179# define acceptds_win_bit FD_ACCEPT_BIT
180# define readfds_win FD_READ
181# define readfds_win_bit FD_READ_BIT
182# define writefds_win FD_WRITE
183# define writefds_win_bit FD_WRITE_BIT
184# define xfds_win FD_OOB
185# define xfds_win_bit FD_OOB_BIT
186# define closefds_win FD_CLOSE
187# define closefds_win_bit FD_CLOSE_BIT
188# define connectfds_win FD_CONNECT
189# define connectfds_win_bit FD_CONNECT_BIT
190
191# define closefds_win FD_CLOSE
192# define closefds_win_bit FD_CLOSE_BIT
193
194# define DO_CHECK_FD_SET(so, events, fdset) \
195 (((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
196
197# define DO_WIN_CHECK_FD_SET(so, events, fdset) DO_CHECK_FD_SET((so), (events), fdset)
198# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /*specific for Unix API */
199
200#endif /* RT_OS_WINDOWS */
201
202#define TCP_ENGAGE_EVENT1(so, fdset) \
203 DO_ENGAGE_EVENT1((so), fdset, tcp)
204
205#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
206 DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
207
208#ifdef RT_OS_WINDOWS
209# define WIN_TCP_ENGAGE_EVENT2(so, fdset, fdset2) TCP_ENGAGE_EVENT2(so, fdset1, fdset2)
210#endif
211
212#define UDP_ENGAGE_EVENT(so, fdset) \
213 DO_ENGAGE_EVENT1((so), fdset, udp)
214
215#define POLL_TCP_EVENTS(rc, error, so, events) \
216 DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
217
218#define POLL_UDP_EVENTS(rc, error, so, events) \
219 DO_POLL_EVENTS((rc), (error), (so), (events), udp)
220
221#define CHECK_FD_SET(so, events, set) \
222 (DO_CHECK_FD_SET((so), (events), set))
223
224#define WIN_CHECK_FD_SET(so, events, set) \
225 (DO_WIN_CHECK_FD_SET((so), (events), set))
226
227/*
228 * Loging macros
229 */
230#if VBOX_WITH_DEBUG_NAT_SOCKETS
231# if defined(RT_OS_WINDOWS)
232# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
233 do { \
234 LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
235 } while (0)
236# else /* !RT_OS_WINDOWS */
237# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
238 do { \
239 LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
240 CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
241 CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
242 CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
243 CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
244 CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
245 CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
246 } while (0)
247# endif /* !RT_OS_WINDOWS */
248#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
249# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
250#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
251
252#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
253 DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
254
255static void activate_port_forwarding(PNATState, const uint8_t *pEther);
256
257static const uint8_t special_ethaddr[6] =
258{
259 0x52, 0x54, 0x00, 0x12, 0x35, 0x00
260};
261
262static const uint8_t broadcast_ethaddr[6] =
263{
264 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
265};
266
267const uint8_t zerro_ethaddr[6] =
268{
269 0x0, 0x0, 0x0, 0x0, 0x0, 0x0
270};
271
272/**
273 * This helper routine do the checks in descriptions to
274 * ''fUnderPolling'' and ''fShouldBeRemoved'' flags
275 * @returns 1 if socket removed and 0 if no changes was made.
276 */
277static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
278{
279 AssertPtrReturn(pData, 0);
280 AssertPtrReturn(pSocket, 0);
281 AssertReturn(pSocket->fUnderPolling, 0);
282 if (pSocket->fShouldBeRemoved)
283 {
284 pSocket->fUnderPolling = 0;
285 sofree(pData, pSocket);
286 /* pSocket is PHANTOM, now */
287 return 1;
288 }
289 return 0;
290}
291
292int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
293 bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
294 int iIcmpCacheLimit, void *pvUser)
295{
296 int rc;
297 PNATState pData;
298 if (u32Netmask & 0x1f)
299 /* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
300 return VERR_INVALID_PARAMETER;
301 pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
302 *ppData = pData;
303 if (!pData)
304 return VERR_NO_MEMORY;
305 pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
306 pData->fUseHostResolver = fUseHostResolver;
307 pData->pvUser = pvUser;
308 pData->netmask = u32Netmask;
309
310 /* sockets & TCP defaults */
311 pData->socket_rcv = 64 * _1K;
312 pData->socket_snd = 64 * _1K;
313 tcp_sndspace = 64 * _1K;
314 tcp_rcvspace = 64 * _1K;
315
316 /*
317 * Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
318 * to avoid release log noise.
319 */
320 pData->soMaxConn = 10;
321
322#ifdef RT_OS_WINDOWS
323 {
324 WSADATA Data;
325 WSAStartup(MAKEWORD(2, 0), &Data);
326 }
327 pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
328#endif
329
330 link_up = 1;
331
332 rc = bootp_dhcp_init(pData);
333 if (RT_FAILURE(rc))
334 {
335 Log(("NAT: DHCP server initialization failed\n"));
336 RTMemFree(pData);
337 *ppData = NULL;
338 return rc;
339 }
340 debug_init(pData);
341 if_init(pData);
342 ip_init(pData);
343 icmp_init(pData, iIcmpCacheLimit);
344
345 /* Initialise mbufs *after* setting the MTU */
346 mbuf_init(pData);
347
348 pData->special_addr.s_addr = u32NetAddr;
349 pData->slirp_ethaddr = &special_ethaddr[0];
350 alias_addr.s_addr = pData->special_addr.s_addr | RT_H2N_U32_C(CTL_ALIAS);
351 /* @todo: add ability to configure this staff */
352
353 /* set default addresses */
354 inet_aton("127.0.0.1", &loopback_addr);
355 rc = slirpInitializeDnsSettings(pData);
356 AssertRCReturn(rc, VINF_NAT_DNS);
357 rc = slirpTftpInit(pData);
358 AssertRCReturn(rc, VINF_NAT_DNS);
359
360 if (i32AliasMode & ~(PKT_ALIAS_LOG|PKT_ALIAS_SAME_PORTS|PKT_ALIAS_PROXY_ONLY))
361 {
362 Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
363 i32AliasMode = 0;
364 }
365 pData->i32AliasMode = i32AliasMode;
366 getouraddr(pData);
367 {
368 int flags = 0;
369 struct in_addr proxy_addr;
370 pData->proxy_alias = LibAliasInit(pData, NULL);
371 if (pData->proxy_alias == NULL)
372 {
373 Log(("NAT: LibAlias default rule wasn't initialized\n"));
374 AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
375 }
376 flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
377#ifndef NO_FW_PUNCH
378 flags |= PKT_ALIAS_PUNCH_FW;
379#endif
380 flags |= pData->i32AliasMode; /* do transparent proxying */
381 flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
382 proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) | CTL_ALIAS);
383 LibAliasSetAddress(pData->proxy_alias, proxy_addr);
384 ftp_alias_load(pData);
385 nbt_alias_load(pData);
386 if (pData->fUseHostResolver)
387 dns_alias_load(pData);
388 }
389#ifdef VBOX_WITH_NAT_SEND2HOME
390 /* @todo: we should know all interfaces available on host. */
391 pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
392 pData->cInHomeAddressSize = 1;
393 inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
394 pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
395# ifdef RT_OS_DARWIN
396 pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
397# endif
398#endif
399 return VINF_SUCCESS;
400}
401
402/**
403 * Register statistics.
404 */
405void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
406{
407#ifdef VBOX_WITH_STATISTICS
408# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
409# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
410# include "counters.h"
411# undef COUNTER
412/** @todo register statistics for the variables dumped by:
413 * ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
414 * mbufstats(pData); sockstats(pData); */
415#else /* VBOX_WITH_STATISTICS */
416 NOREF(pData);
417 NOREF(pDrvIns);
418#endif /* !VBOX_WITH_STATISTICS */
419}
420
421/**
422 * Deregister statistics.
423 */
424void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
425{
426 if (pData == NULL)
427 return;
428#ifdef VBOX_WITH_STATISTICS
429# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
430# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
431# include "counters.h"
432#else /* VBOX_WITH_STATISTICS */
433 NOREF(pData);
434 NOREF(pDrvIns);
435#endif /* !VBOX_WITH_STATISTICS */
436}
437
438/**
439 * Marks the link as up, making it possible to establish new connections.
440 */
441void slirp_link_up(PNATState pData)
442{
443 struct arp_cache_entry *ac;
444 link_up = 1;
445
446 if (LIST_EMPTY(&pData->arp_cache))
447 return;
448
449 LIST_FOREACH(ac, &pData->arp_cache, list)
450 {
451 activate_port_forwarding(pData, ac->ether);
452 }
453}
454
455/**
456 * Marks the link as down and cleans up the current connections.
457 */
458void slirp_link_down(PNATState pData)
459{
460 struct socket *so;
461 struct port_forward_rule *rule;
462
463 while ((so = tcb.so_next) != &tcb)
464 {
465 /* Don't miss TCB releasing */
466 if ( !sototcpcb(so)
467 && ( so->so_state & SS_NOFDREF
468 || so->s == -1))
469 sofree(pData, so);
470 else
471 tcp_close(pData, sototcpcb(so));
472 }
473
474 while ((so = udb.so_next) != &udb)
475 udp_detach(pData, so);
476
477 /*
478 * Clear the active state of port-forwarding rules to force
479 * re-setup on restoration of communications.
480 */
481 LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
482 {
483 rule->activated = 0;
484 }
485 pData->cRedirectionsActive = 0;
486
487 link_up = 0;
488}
489
490/**
491 * Terminates the slirp component.
492 */
493void slirp_term(PNATState pData)
494{
495 if (pData == NULL)
496 return;
497 icmp_finit(pData);
498
499 slirp_link_down(pData);
500 slirpReleaseDnsSettings(pData);
501 ftp_alias_unload(pData);
502 nbt_alias_unload(pData);
503 if (pData->fUseHostResolver)
504 {
505 dns_alias_unload(pData);
506#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
507 while (!LIST_EMPTY(&pData->DNSMapHead))
508 {
509 PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
510 LIST_REMOVE(pDnsEntry, MapList);
511 RTStrFree(pDnsEntry->pszCName);
512 RTMemFree(pDnsEntry);
513 }
514#endif
515 }
516 while (!LIST_EMPTY(&instancehead))
517 {
518 struct libalias *la = LIST_FIRST(&instancehead);
519 /* libalias do all clean up */
520 LibAliasUninit(la);
521 }
522 while (!LIST_EMPTY(&pData->arp_cache))
523 {
524 struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
525 LIST_REMOVE(ac, list);
526 RTMemFree(ac);
527 }
528 slirpTftpTerm(pData);
529 bootp_dhcp_fini(pData);
530 m_fini(pData);
531#ifdef RT_OS_WINDOWS
532 WSACleanup();
533#endif
534#ifndef VBOX_WITH_SLIRP_BSD_SBUF
535#ifdef LOG_ENABLED
536 Log(("\n"
537 "NAT statistics\n"
538 "--------------\n"
539 "\n"));
540 ipstats(pData);
541 tcpstats(pData);
542 udpstats(pData);
543 icmpstats(pData);
544 mbufstats(pData);
545 sockstats(pData);
546 Log(("\n"
547 "\n"
548 "\n"));
549#endif
550#endif
551 RTMemFree(pData);
552}
553
554
555#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
556#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
557
558/*
559 * curtime kept to an accuracy of 1ms
560 */
561static void updtime(PNATState pData)
562{
563#ifdef RT_OS_WINDOWS
564 struct _timeb tb;
565
566 _ftime(&tb);
567 curtime = (u_int)tb.time * (u_int)1000;
568 curtime += (u_int)tb.millitm;
569#else
570 gettimeofday(&tt, 0);
571
572 curtime = (u_int)tt.tv_sec * (u_int)1000;
573 curtime += (u_int)tt.tv_usec / (u_int)1000;
574
575 if ((tt.tv_usec % 1000) >= 500)
576 curtime++;
577#endif
578}
579
580#ifdef RT_OS_WINDOWS
581void slirp_select_fill(PNATState pData, int *pnfds)
582#else /* RT_OS_WINDOWS */
583void slirp_select_fill(PNATState pData, int *pnfds, struct pollfd *polls)
584#endif /* !RT_OS_WINDOWS */
585{
586 struct socket *so, *so_next;
587 int nfds;
588#if defined(RT_OS_WINDOWS)
589 int rc;
590 int error;
591#else
592 int poll_index = 0;
593#endif
594 int i;
595
596 STAM_PROFILE_START(&pData->StatFill, a);
597
598 nfds = *pnfds;
599
600 /*
601 * First, TCP sockets
602 */
603 do_slowtimo = 0;
604 if (!link_up)
605 goto done;
606
607 /*
608 * *_slowtimo needs calling if there are IP fragments
609 * in the fragment queue, or there are TCP connections active
610 */
611 /* XXX:
612 * triggering of fragment expiration should be the same but use new macroses
613 */
614 do_slowtimo = (tcb.so_next != &tcb);
615 if (!do_slowtimo)
616 {
617 for (i = 0; i < IPREASS_NHASH; i++)
618 {
619 if (!TAILQ_EMPTY(&ipq[i]))
620 {
621 do_slowtimo = 1;
622 break;
623 }
624 }
625 }
626 /* always add the ICMP socket */
627#ifndef RT_OS_WINDOWS
628 pData->icmp_socket.so_poll_index = -1;
629#endif
630 ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
631
632 STAM_COUNTER_RESET(&pData->StatTCP);
633 STAM_COUNTER_RESET(&pData->StatTCPHot);
634
635 QSOCKET_FOREACH(so, so_next, tcp)
636 /* { */
637 Assert(so->so_type == IPPROTO_TCP);
638#if !defined(RT_OS_WINDOWS)
639 so->so_poll_index = -1;
640#endif
641 STAM_COUNTER_INC(&pData->StatTCP);
642#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
643 /* TCP socket can't be cloned */
644 Assert((!so->so_cloneOf));
645#endif
646 /*
647 * See if we need a tcp_fasttimo
648 */
649 if ( time_fasttimo == 0
650 && so->so_tcpcb != NULL
651 && so->so_tcpcb->t_flags & TF_DELACK)
652 {
653 time_fasttimo = curtime; /* Flag when we want a fasttimo */
654 }
655
656 /*
657 * NOFDREF can include still connecting to local-host,
658 * newly socreated() sockets etc. Don't want to select these.
659 */
660 if (so->so_state & SS_NOFDREF || so->s == -1)
661 CONTINUE(tcp);
662
663 /*
664 * Set for reading sockets which are accepting
665 */
666 if (so->so_state & SS_FACCEPTCONN)
667 {
668 STAM_COUNTER_INC(&pData->StatTCPHot);
669 TCP_ENGAGE_EVENT1(so, readfds);
670 CONTINUE(tcp);
671 }
672
673 /*
674 * Set for writing sockets which are connecting
675 */
676 if (so->so_state & SS_ISFCONNECTING)
677 {
678 Log2(("connecting %R[natsock] engaged\n",so));
679 STAM_COUNTER_INC(&pData->StatTCPHot);
680#ifdef RT_OS_WINDOWS
681 WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
682#else
683 TCP_ENGAGE_EVENT1(so, writefds);
684#endif
685 }
686
687 /*
688 * Set for writing if we are connected, can send more, and
689 * we have something to send
690 */
691 if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
692 {
693 STAM_COUNTER_INC(&pData->StatTCPHot);
694 TCP_ENGAGE_EVENT1(so, writefds);
695 }
696
697 /*
698 * Set for reading (and urgent data) if we are connected, can
699 * receive more, and we have room for it XXX /2 ?
700 */
701 /* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
702 if ( CONN_CANFRCV(so)
703 && (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
704#ifdef RT_OS_WINDOWS
705 && !(so->so_state & SS_ISFCONNECTING)
706#endif
707 )
708 {
709 STAM_COUNTER_INC(&pData->StatTCPHot);
710 TCP_ENGAGE_EVENT2(so, readfds, xfds);
711 }
712 LOOP_LABEL(tcp, so, so_next);
713 }
714
715 /*
716 * UDP sockets
717 */
718 STAM_COUNTER_RESET(&pData->StatUDP);
719 STAM_COUNTER_RESET(&pData->StatUDPHot);
720
721 QSOCKET_FOREACH(so, so_next, udp)
722 /* { */
723
724 Assert(so->so_type == IPPROTO_UDP);
725 STAM_COUNTER_INC(&pData->StatUDP);
726#if !defined(RT_OS_WINDOWS)
727 so->so_poll_index = -1;
728#endif
729
730 /*
731 * See if it's timed out
732 */
733 if (so->so_expire)
734 {
735 if (so->so_expire <= curtime)
736 {
737 Log2(("NAT: %R[natsock] expired\n", so));
738 if (so->so_timeout != NULL)
739 {
740 /* so_timeout - might change the so_expire value or
741 * drop so_timeout* from so.
742 */
743 so->so_timeout(pData, so, so->so_timeout_arg);
744 /* on 4.2 so->
745 */
746 if ( so_next->so_prev != so /* so_timeout freed the socket */
747 || so->so_timeout) /* so_timeout just freed so_timeout */
748 CONTINUE_NO_UNLOCK(udp);
749 }
750 UDP_DETACH(pData, so, so_next);
751 CONTINUE_NO_UNLOCK(udp);
752 }
753 }
754#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
755 if (so->so_cloneOf)
756 CONTINUE_NO_UNLOCK(udp);
757#endif
758
759 /*
760 * When UDP packets are received from over the link, they're
761 * sendto()'d straight away, so no need for setting for writing
762 * Limit the number of packets queued by this session to 4.
763 * Note that even though we try and limit this to 4 packets,
764 * the session could have more queued if the packets needed
765 * to be fragmented.
766 *
767 * (XXX <= 4 ?)
768 */
769 if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
770 {
771 STAM_COUNTER_INC(&pData->StatUDPHot);
772 UDP_ENGAGE_EVENT(so, readfds);
773 }
774 LOOP_LABEL(udp, so, so_next);
775 }
776done:
777
778#if defined(RT_OS_WINDOWS)
779 *pnfds = VBOX_EVENT_COUNT;
780#else /* RT_OS_WINDOWS */
781 AssertRelease(poll_index <= *pnfds);
782 *pnfds = poll_index;
783#endif /* !RT_OS_WINDOWS */
784
785 STAM_PROFILE_STOP(&pData->StatFill, a);
786}
787
788
789/**
790 * This function do Connection or sending tcp sequence to.
791 * @returns if true operation completed
792 * @note: functions call tcp_input that potentially could lead to tcp_drop
793 */
794static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
795{
796 int ret;
797 LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
798 /*
799 * Check for non-blocking, still-connecting sockets
800 */
801 if (so->so_state & SS_ISFCONNECTING)
802 {
803 Log2(("connecting %R[natsock] catched\n", so));
804 /* Connected */
805 so->so_state &= ~SS_ISFCONNECTING;
806
807 /*
808 * This should be probably guarded by PROBE_CONN too. Anyway,
809 * we disable it on OS/2 because the below send call returns
810 * EFAULT which causes the opened TCP socket to close right
811 * after it has been opened and connected.
812 */
813#ifndef RT_OS_OS2
814 ret = send(so->s, (const char *)&ret, 0, 0);
815 if (ret < 0)
816 {
817 /* XXXXX Must fix, zero bytes is a NOP */
818 if ( soIgnorableErrorCode(errno)
819 || errno == ENOTCONN)
820 {
821 LogFlowFunc(("LEAVE: false\n"));
822 return false;
823 }
824
825 /* else failed */
826 so->so_state = SS_NOFDREF;
827 }
828 /* else so->so_state &= ~SS_ISFCONNECTING; */
829#endif
830
831 /*
832 * Continue tcp_input
833 */
834 TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
835 /* continue; */
836 }
837 else if (!fConnectOnly)
838 SOWRITE(ret, pData, so);
839 /*
840 * XXX If we wrote something (a lot), there could be the need
841 * for a window update. In the worst case, the remote will send
842 * a window probe to get things going again.
843 */
844 LogFlowFunc(("LEAVE: true\n"));
845 return true;
846}
847
848#if defined(RT_OS_WINDOWS)
849void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
850#else /* RT_OS_WINDOWS */
851void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
852#endif /* !RT_OS_WINDOWS */
853{
854 struct socket *so, *so_next;
855 int ret;
856#if defined(RT_OS_WINDOWS)
857 WSANETWORKEVENTS NetworkEvents;
858 int rc;
859 int error;
860#endif
861
862 STAM_PROFILE_START(&pData->StatPoll, a);
863
864 /* Update time */
865 updtime(pData);
866
867 /*
868 * See if anything has timed out
869 */
870 if (link_up)
871 {
872 if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
873 {
874 STAM_PROFILE_START(&pData->StatFastTimer, b);
875 tcp_fasttimo(pData);
876 time_fasttimo = 0;
877 STAM_PROFILE_STOP(&pData->StatFastTimer, b);
878 }
879 if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
880 {
881 STAM_PROFILE_START(&pData->StatSlowTimer, c);
882 ip_slowtimo(pData);
883 tcp_slowtimo(pData);
884 last_slowtimo = curtime;
885 STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
886 }
887 }
888#if defined(RT_OS_WINDOWS)
889 if (fTimeout)
890 return; /* only timer update */
891#endif
892
893 /*
894 * Check sockets
895 */
896 if (!link_up)
897 goto done;
898#if defined(RT_OS_WINDOWS)
899 /*XXX: before renaming please make see define
900 * fIcmp in slirp_state.h
901 */
902 if (fIcmp)
903 sorecvfrom(pData, &pData->icmp_socket);
904#else
905 if ( (pData->icmp_socket.s != -1)
906 && CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
907 sorecvfrom(pData, &pData->icmp_socket);
908#endif
909 /*
910 * Check TCP sockets
911 */
912 QSOCKET_FOREACH(so, so_next, tcp)
913 /* { */
914 /* TCP socket can't be cloned */
915#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
916 Assert((!so->so_cloneOf));
917#endif
918 Assert(!so->fUnderPolling);
919 so->fUnderPolling = 1;
920 if (slirpVerifyAndFreeSocket(pData, so))
921 CONTINUE(tcp);
922 /*
923 * FD_ISSET is meaningless on these sockets
924 * (and they can crash the program)
925 */
926 if (so->so_state & SS_NOFDREF || so->s == -1)
927 {
928 so->fUnderPolling = 0;
929 CONTINUE(tcp);
930 }
931
932 POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
933
934 LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
935
936
937 /*
938 * Check for URG data
939 * This will soread as well, so no need to
940 * test for readfds below if this succeeds
941 */
942
943 /* out-of-band data */
944 if ( CHECK_FD_SET(so, NetworkEvents, xfds)
945#ifdef RT_OS_DARWIN
946 /* Darwin and probably BSD hosts generates POLLPRI|POLLHUP event on receiving TCP.flags.{ACK|URG|FIN} this
947 * combination on other Unixs hosts doesn't enter to this branch
948 */
949 && !CHECK_FD_SET(so, NetworkEvents, closefds)
950#endif
951#ifdef RT_OS_WINDOWS
952 /**
953 * In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
954 */
955 && !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
956#endif
957 )
958 {
959 sorecvoob(pData, so);
960 if (slirpVerifyAndFreeSocket(pData, so))
961 CONTINUE(tcp);
962 }
963
964 /*
965 * Check sockets for reading
966 */
967 else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
968 || WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
969 {
970
971#ifdef RT_OS_WINDOWS
972 if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
973 {
974 /* Finish connection first */
975 /* should we ignore return value? */
976 bool fRet = slirpConnectOrWrite(pData, so, true);
977 LogFunc(("fRet:%RTbool\n", fRet));
978 if (slirpVerifyAndFreeSocket(pData, so))
979 CONTINUE(tcp);
980 }
981#endif
982 /*
983 * Check for incoming connections
984 */
985 if (so->so_state & SS_FACCEPTCONN)
986 {
987 TCP_CONNECT(pData, so);
988 if (slirpVerifyAndFreeSocket(pData, so))
989 CONTINUE(tcp);
990 if (!CHECK_FD_SET(so, NetworkEvents, closefds))
991 {
992 so->fUnderPolling = 0;
993 CONTINUE(tcp);
994 }
995 }
996
997 ret = soread(pData, so);
998 if (slirpVerifyAndFreeSocket(pData, so))
999 CONTINUE(tcp);
1000 /* Output it if we read something */
1001 if (RT_LIKELY(ret > 0))
1002 TCP_OUTPUT(pData, sototcpcb(so));
1003
1004 if (slirpVerifyAndFreeSocket(pData, so))
1005 CONTINUE(tcp);
1006 }
1007
1008 /*
1009 * Check for FD_CLOSE events.
1010 * in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
1011 */
1012 if ( CHECK_FD_SET(so, NetworkEvents, closefds)
1013 || (so->so_close == 1))
1014 {
1015 /*
1016 * drain the socket
1017 */
1018 for (; so_next->so_prev == so
1019 && !slirpVerifyAndFreeSocket(pData, so);)
1020 {
1021 ret = soread(pData, so);
1022 if (slirpVerifyAndFreeSocket(pData, so))
1023 break;
1024
1025 if (ret > 0)
1026 TCP_OUTPUT(pData, sototcpcb(so));
1027 else if (so_next->so_prev == so)
1028 {
1029 Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
1030 break;
1031 }
1032 }
1033
1034 /* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
1035 if (so_next->so_prev == so)
1036 {
1037 /* mark the socket for termination _after_ it was drained */
1038 so->so_close = 1;
1039 /* No idea about Windows but on Posix, POLLHUP means that we can't send more.
1040 * Actually in the specific error scenario, POLLERR is set as well. */
1041#ifndef RT_OS_WINDOWS
1042 if (CHECK_FD_SET(so, NetworkEvents, rderr))
1043 sofcantsendmore(so);
1044#endif
1045 }
1046 if (so_next->so_prev == so)
1047 so->fUnderPolling = 0;
1048 CONTINUE(tcp);
1049 }
1050
1051 /*
1052 * Check sockets for writing
1053 */
1054 if ( CHECK_FD_SET(so, NetworkEvents, writefds)
1055#ifdef RT_OS_WINDOWS
1056 || WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
1057#endif
1058 )
1059 {
1060 int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
1061 /* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
1062 * so we should be ready to such situations.
1063 */
1064 if (slirpVerifyAndFreeSocket(pData, so))
1065 CONTINUE(tcp);
1066 else if (!fConnectOrWriteSuccess)
1067 {
1068 so->fUnderPolling = 0;
1069 CONTINUE(tcp);
1070 }
1071 /* slirpConnectionOrWrite succeeded and socket wasn't dropped */
1072 }
1073
1074 /*
1075 * Probe a still-connecting, non-blocking socket
1076 * to check if it's still alive
1077 */
1078#ifdef PROBE_CONN
1079 if (so->so_state & SS_ISFCONNECTING)
1080 {
1081 ret = recv(so->s, (char *)&ret, 0, 0);
1082
1083 if (ret < 0)
1084 {
1085 /* XXX */
1086 if ( soIgnorableErrorCode(errno)
1087 || errno == ENOTCONN)
1088 {
1089 CONTINUE(tcp); /* Still connecting, continue */
1090 }
1091
1092 /* else failed */
1093 so->so_state = SS_NOFDREF;
1094
1095 /* tcp_input will take care of it */
1096 }
1097 else
1098 {
1099 ret = send(so->s, &ret, 0, 0);
1100 if (ret < 0)
1101 {
1102 /* XXX */
1103 if ( soIgnorableErrorCode(errno)
1104 || errno == ENOTCONN)
1105 {
1106 CONTINUE(tcp);
1107 }
1108 /* else failed */
1109 so->so_state = SS_NOFDREF;
1110 }
1111 else
1112 so->so_state &= ~SS_ISFCONNECTING;
1113
1114 }
1115 TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1116 } /* SS_ISFCONNECTING */
1117#endif
1118 if (!slirpVerifyAndFreeSocket(pData, so))
1119 so->fUnderPolling = 0;
1120 LOOP_LABEL(tcp, so, so_next);
1121 }
1122
1123 /*
1124 * Now UDP sockets.
1125 * Incoming packets are sent straight away, they're not buffered.
1126 * Incoming UDP data isn't buffered either.
1127 */
1128 QSOCKET_FOREACH(so, so_next, udp)
1129 /* { */
1130#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
1131 if (so->so_cloneOf)
1132 CONTINUE_NO_UNLOCK(udp);
1133#endif
1134#if 0
1135 so->fUnderPolling = 1;
1136 if(slirpVerifyAndFreeSocket(pData, so));
1137 CONTINUE(udp);
1138 so->fUnderPolling = 0;
1139#endif
1140
1141 POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1142
1143 LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1144
1145 if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1146 {
1147 SORECVFROM(pData, so);
1148 }
1149 LOOP_LABEL(udp, so, so_next);
1150 }
1151
1152done:
1153
1154 STAM_PROFILE_STOP(&pData->StatPoll, a);
1155}
1156
1157
1158struct arphdr
1159{
1160 unsigned short ar_hrd; /* format of hardware address */
1161 unsigned short ar_pro; /* format of protocol address */
1162 unsigned char ar_hln; /* length of hardware address */
1163 unsigned char ar_pln; /* length of protocol address */
1164 unsigned short ar_op; /* ARP opcode (command) */
1165
1166 /*
1167 * Ethernet looks like this : This bit is variable sized however...
1168 */
1169 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1170 unsigned char ar_sip[4]; /* sender IP address */
1171 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1172 unsigned char ar_tip[4]; /* target IP address */
1173};
1174AssertCompileSize(struct arphdr, 28);
1175
1176static void arp_output(PNATState pData, const uint8_t *pcu8EtherSource, const struct arphdr *pcARPHeaderSource, uint32_t ip4TargetAddress)
1177{
1178 struct ethhdr *pEtherHeaderResponse;
1179 struct arphdr *pARPHeaderResponse;
1180 uint32_t ip4TargetAddressInHostFormat;
1181 struct mbuf *pMbufResponse;
1182
1183 Assert((pcu8EtherSource));
1184 if (!pcu8EtherSource)
1185 return;
1186 ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
1187
1188 pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1189 if (!pMbufResponse)
1190 return;
1191 pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
1192 /* @note: if_encap will swap src and dst*/
1193 memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
1194 pMbufResponse->m_data += ETH_HLEN;
1195 pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
1196 pMbufResponse->m_len = sizeof(struct arphdr);
1197
1198 pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
1199 pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1200 pARPHeaderResponse->ar_hln = ETH_ALEN;
1201 pARPHeaderResponse->ar_pln = 4;
1202 pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
1203 memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
1204
1205 if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
1206 {
1207 static bool fTagErrorReported;
1208 if (!fTagErrorReported)
1209 {
1210 LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
1211 (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
1212 fTagErrorReported = true;
1213 }
1214 }
1215 pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
1216
1217 memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
1218 memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
1219 memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
1220 if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
1221}
1222/**
1223 * @note This function will free m!
1224 */
1225static void arp_input(PNATState pData, struct mbuf *m)
1226{
1227 struct ethhdr *pEtherHeader;
1228 struct arphdr *pARPHeader;
1229 uint32_t ip4TargetAddress;
1230
1231 int ar_op;
1232 pEtherHeader = mtod(m, struct ethhdr *);
1233 pARPHeader = (struct arphdr *)&pEtherHeader[1];
1234
1235 ar_op = RT_N2H_U16(pARPHeader->ar_op);
1236 ip4TargetAddress = *(uint32_t*)pARPHeader->ar_tip;
1237
1238 switch (ar_op)
1239 {
1240 case ARPOP_REQUEST:
1241 if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
1242 || CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
1243 || CTL_CHECK(ip4TargetAddress, CTL_TFTP))
1244 arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
1245
1246 /* Gratuitous ARP */
1247 if ( *(uint32_t *)pARPHeader->ar_sip == *(uint32_t *)pARPHeader->ar_tip
1248 && memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
1249 && memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
1250 {
1251 /* We've received an announce about address assignment,
1252 * let's do an ARP cache update
1253 */
1254 static bool fGratuitousArpReported;
1255 if (!fGratuitousArpReported)
1256 {
1257 LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
1258 pARPHeader->ar_sip, pARPHeader->ar_sha));
1259 fGratuitousArpReported = true;
1260 }
1261 slirp_arp_cache_update_or_add(pData, *(uint32_t *)pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1262 }
1263 break;
1264
1265 case ARPOP_REPLY:
1266 slirp_arp_cache_update_or_add(pData, *(uint32_t *)pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
1267 break;
1268
1269 default:
1270 break;
1271 }
1272
1273 m_freem(pData, m);
1274}
1275
1276/**
1277 * Feed a packet into the slirp engine.
1278 *
1279 * @param m Data buffer, m_len is not valid.
1280 * @param cbBuf The length of the data in m.
1281 */
1282void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
1283{
1284 int proto;
1285 static bool fWarnedIpv6;
1286 struct ethhdr *eh;
1287 uint8_t au8Ether[ETH_ALEN];
1288
1289 m->m_len = cbBuf;
1290 if (cbBuf < ETH_HLEN)
1291 {
1292 Log(("NAT: packet having size %d has been ignored\n", m->m_len));
1293 m_freem(pData, m);
1294 return;
1295 }
1296 eh = mtod(m, struct ethhdr *);
1297 proto = RT_N2H_U16(eh->h_proto);
1298
1299 memcpy(au8Ether, eh->h_source, ETH_ALEN);
1300
1301 switch(proto)
1302 {
1303 case ETH_P_ARP:
1304 arp_input(pData, m);
1305 break;
1306
1307 case ETH_P_IP:
1308 /* Update time. Important if the network is very quiet, as otherwise
1309 * the first outgoing connection gets an incorrect timestamp. */
1310 updtime(pData);
1311 m_adj(m, ETH_HLEN);
1312 M_ASSERTPKTHDR(m);
1313 m->m_pkthdr.header = mtod(m, void *);
1314 ip_input(pData, m);
1315 break;
1316
1317 case ETH_P_IPV6:
1318 m_freem(pData, m);
1319 if (!fWarnedIpv6)
1320 {
1321 LogRel(("NAT: IPv6 not supported\n"));
1322 fWarnedIpv6 = true;
1323 }
1324 break;
1325
1326 default:
1327 Log(("NAT: Unsupported protocol %x\n", proto));
1328 m_freem(pData, m);
1329 break;
1330 }
1331
1332 if (pData->cRedirectionsActive != pData->cRedirectionsStored)
1333 activate_port_forwarding(pData, au8Ether);
1334}
1335
1336/**
1337 * Output the IP packet to the ethernet device.
1338 *
1339 * @note This function will free m!
1340 */
1341void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
1342{
1343 struct ethhdr *eh;
1344 uint8_t *mbuf = NULL;
1345 size_t mlen = 0;
1346 STAM_PROFILE_START(&pData->StatIF_encap, a);
1347 LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
1348 pData, eth_proto, m, flags));
1349
1350 M_ASSERTPKTHDR(m);
1351 m->m_data -= ETH_HLEN;
1352 m->m_len += ETH_HLEN;
1353 eh = mtod(m, struct ethhdr *);
1354 mlen = m->m_len;
1355
1356 if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
1357 {
1358 struct m_tag *t = m_tag_first(m);
1359 uint8_t u8ServiceId = CTL_ALIAS;
1360 memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
1361 memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
1362 Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
1363 if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
1364 {
1365 /* don't do anything */
1366 m_freem(pData, m);
1367 goto done;
1368 }
1369 if ( t
1370 && (t = m_tag_find(m, PACKET_SERVICE, NULL)))
1371 {
1372 Assert(t);
1373 u8ServiceId = *(uint8_t *)&t[1];
1374 }
1375 eh->h_source[5] = u8ServiceId;
1376 }
1377 /*
1378 * we're processing the chain, that isn't not expected.
1379 */
1380 Assert((!m->m_next));
1381 if (m->m_next)
1382 {
1383 Log(("NAT: if_encap's recived the chain, dropping...\n"));
1384 m_freem(pData, m);
1385 goto done;
1386 }
1387 mbuf = mtod(m, uint8_t *);
1388 eh->h_proto = RT_H2N_U16(eth_proto);
1389 LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
1390 if (flags & ETH_ENCAP_URG)
1391 slirp_urg_output(pData->pvUser, m, mbuf, mlen);
1392 else
1393 slirp_output(pData->pvUser, m, mbuf, mlen);
1394done:
1395 STAM_PROFILE_STOP(&pData->StatIF_encap, a);
1396 LogFlowFuncLeave();
1397}
1398
1399/**
1400 * Still we're using dhcp server leasing to map ether to IP
1401 * @todo see rt_lookup_in_cache
1402 */
1403static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
1404{
1405 uint32_t ip = INADDR_ANY;
1406 int rc;
1407
1408 if (eth_addr == NULL)
1409 return INADDR_ANY;
1410
1411 if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
1412 || memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
1413 return INADDR_ANY;
1414
1415 rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
1416 if (RT_SUCCESS(rc))
1417 return ip;
1418
1419 bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
1420 /* ignore return code, ip will be set to INADDR_ANY on error */
1421 return ip;
1422}
1423
1424/**
1425 * We need check if we've activated port forwarding
1426 * for specific machine ... that of course relates to
1427 * service mode
1428 * @todo finish this for service case
1429 */
1430static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
1431{
1432 struct port_forward_rule *rule, *tmp;
1433 const uint8_t *pu8EthSource = h_source;
1434
1435 /* check mac here */
1436 LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
1437 {
1438 struct socket *so;
1439 struct alias_link *alias_link;
1440 struct libalias *lib;
1441 int flags;
1442 struct sockaddr sa;
1443 struct sockaddr_in *psin;
1444 socklen_t socketlen;
1445 struct in_addr alias;
1446 int rc;
1447 uint32_t guest_addr; /* need to understand if we already give address to guest */
1448
1449 if (rule->activated)
1450 continue;
1451
1452#ifdef VBOX_WITH_NAT_SERVICE
1453 /**
1454 * case when guest ip is INADDR_ANY shouldn't appear in NAT service
1455 */
1456 Assert((rule->guest_addr.s_addr != INADDR_ANY));
1457 guest_addr = rule->guest_addr.s_addr;
1458#else /* VBOX_WITH_NAT_SERVICE */
1459 guest_addr = find_guest_ip(pData, pu8EthSource);
1460#endif /* !VBOX_WITH_NAT_SERVICE */
1461 if (guest_addr == INADDR_ANY)
1462 {
1463 /* the address wasn't granted */
1464 return;
1465 }
1466
1467#if !defined(VBOX_WITH_NAT_SERVICE)
1468 if ( rule->guest_addr.s_addr != guest_addr
1469 && rule->guest_addr.s_addr != INADDR_ANY)
1470 continue;
1471 if (rule->guest_addr.s_addr == INADDR_ANY)
1472 rule->guest_addr.s_addr = guest_addr;
1473#endif
1474
1475 LogRel(("NAT: set redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1476 rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1477
1478 if (rule->proto == IPPROTO_UDP)
1479 so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1480 RT_H2N_U16(rule->guest_port), 0);
1481 else
1482 so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
1483 RT_H2N_U16(rule->guest_port), 0);
1484
1485 if (so == NULL)
1486 goto remove_port_forwarding;
1487
1488 psin = (struct sockaddr_in *)&sa;
1489 psin->sin_family = AF_INET;
1490 psin->sin_port = 0;
1491 psin->sin_addr.s_addr = INADDR_ANY;
1492 socketlen = sizeof(struct sockaddr);
1493
1494 rc = getsockname(so->s, &sa, &socketlen);
1495 if (rc < 0 || sa.sa_family != AF_INET)
1496 goto remove_port_forwarding;
1497
1498 psin = (struct sockaddr_in *)&sa;
1499
1500 lib = LibAliasInit(pData, NULL);
1501 flags = LibAliasSetMode(lib, 0, 0);
1502 flags |= pData->i32AliasMode;
1503 flags |= PKT_ALIAS_REVERSE; /* set reverse */
1504 flags = LibAliasSetMode(lib, flags, ~0);
1505
1506 alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) | CTL_ALIAS);
1507 alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
1508 alias, RT_H2N_U16(rule->guest_port),
1509 pData->special_addr, -1, /* not very clear for now */
1510 rule->proto);
1511 if (!alias_link)
1512 goto remove_port_forwarding;
1513
1514 so->so_la = lib;
1515 rule->activated = 1;
1516 rule->so = so;
1517 pData->cRedirectionsActive++;
1518 continue;
1519
1520 remove_port_forwarding:
1521 LogRel(("NAT: failed to redirect %s %d => %d\n",
1522 (rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
1523 LIST_REMOVE(rule, list);
1524 pData->cRedirectionsStored--;
1525 RTMemFree(rule);
1526 }
1527}
1528
1529/**
1530 * Changes in 3.1 instead of opening new socket do the following:
1531 * gain more information:
1532 * 1. bind IP
1533 * 2. host port
1534 * 3. guest port
1535 * 4. proto
1536 * 5. guest MAC address
1537 * the guest's MAC address is rather important for service, but we easily
1538 * could get it from VM configuration in DrvNAT or Service, the idea is activating
1539 * corresponding port-forwarding
1540 */
1541int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1542 struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
1543{
1544 struct port_forward_rule *rule = NULL;
1545 LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1546 {
1547 if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1548 && rule->host_port == host_port
1549 && rule->bind_ip.s_addr == host_addr.s_addr
1550 && rule->guest_port == guest_port
1551 && rule->guest_addr.s_addr == guest_addr.s_addr
1552 )
1553 return 0; /* rule has been already registered */
1554 }
1555
1556 rule = RTMemAllocZ(sizeof(struct port_forward_rule));
1557 if (rule == NULL)
1558 return 1;
1559
1560 rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
1561 rule->host_port = host_port;
1562 rule->guest_port = guest_port;
1563 rule->guest_addr.s_addr = guest_addr.s_addr;
1564 rule->bind_ip.s_addr = host_addr.s_addr;
1565 if (ethaddr != NULL)
1566 memcpy(rule->mac_address, ethaddr, ETH_ALEN);
1567 /* @todo add mac address */
1568 LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
1569 pData->cRedirectionsStored++;
1570 /* activate port-forwarding if guest has already got assigned IP */
1571 if ( ethaddr
1572 && memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
1573 activate_port_forwarding(pData, ethaddr);
1574 return 0;
1575}
1576
1577int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
1578 struct in_addr guest_addr, int guest_port)
1579{
1580 struct port_forward_rule *rule = NULL;
1581 LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
1582 {
1583 if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
1584 && rule->host_port == host_port
1585 && rule->guest_port == guest_port
1586 && rule->bind_ip.s_addr == host_addr.s_addr
1587 && rule->guest_addr.s_addr == guest_addr.s_addr
1588 && rule->activated)
1589 {
1590 LogRel(("NAT: remove redirect %s host port %d => guest port %d @ %RTnaipv4\n",
1591 rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
1592
1593 LibAliasUninit(rule->so->so_la);
1594 if (is_udp)
1595 udp_detach(pData, rule->so);
1596 else
1597 tcp_close(pData, sototcpcb(rule->so));
1598 LIST_REMOVE(rule, list);
1599 RTMemFree(rule);
1600 pData->cRedirectionsStored--;
1601 break;
1602 }
1603
1604 }
1605 return 0;
1606}
1607
1608void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
1609{
1610#ifndef VBOX_WITH_NAT_SERVICE
1611 memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1612#endif
1613 if (GuestIP != INADDR_ANY)
1614 {
1615 slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
1616 activate_port_forwarding(pData, ethaddr);
1617 }
1618}
1619
1620#if defined(RT_OS_WINDOWS)
1621HANDLE *slirp_get_events(PNATState pData)
1622{
1623 return pData->phEvents;
1624}
1625void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1626{
1627 pData->phEvents[index] = hEvent;
1628}
1629#endif
1630
1631unsigned int slirp_get_timeout_ms(PNATState pData)
1632{
1633 if (link_up)
1634 {
1635 if (time_fasttimo)
1636 return 2;
1637 if (do_slowtimo)
1638 return 500; /* see PR_SLOWHZ */
1639 }
1640 return 3600*1000; /* one hour */
1641}
1642
1643#ifndef RT_OS_WINDOWS
1644int slirp_get_nsock(PNATState pData)
1645{
1646 return pData->nsock;
1647}
1648#endif
1649
1650/*
1651 * this function called from NAT thread
1652 */
1653void slirp_post_sent(PNATState pData, void *pvArg)
1654{
1655 struct mbuf *m = (struct mbuf *)pvArg;
1656 m_freem(pData, m);
1657}
1658
1659void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
1660{
1661 Log2(("tftp_prefix: %s\n", tftpPrefix));
1662 tftp_prefix = tftpPrefix;
1663}
1664
1665void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
1666{
1667 Log2(("bootFile: %s\n", bootFile));
1668 bootp_filename = bootFile;
1669}
1670
1671void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
1672{
1673 Log2(("next_server: %s\n", next_server));
1674 if (next_server == NULL)
1675 pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) | CTL_TFTP);
1676 else
1677 inet_aton(next_server, &pData->tftp_server);
1678}
1679
1680int slirp_set_binding_address(PNATState pData, char *addr)
1681{
1682 if (addr == NULL || (inet_aton(addr, &pData->bindIP) == 0))
1683 {
1684 pData->bindIP.s_addr = INADDR_ANY;
1685 return 1;
1686 }
1687 return 0;
1688}
1689
1690void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
1691{
1692 if (!pData->fUseHostResolver)
1693 {
1694 Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
1695 pData->fUseDnsProxy = fDNSProxy;
1696 }
1697 else if (fDNSProxy)
1698 LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
1699}
1700
1701#define CHECK_ARG(name, val, lim_min, lim_max) \
1702 do { \
1703 if ((val) < (lim_min) || (val) > (lim_max)) \
1704 { \
1705 LogRel(("NAT: (" #name ":%d) has been ignored, " \
1706 "because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
1707 return; \
1708 } \
1709 else \
1710 LogRel(("NAT: (" #name ":%d)\n", (val))); \
1711 } while (0)
1712
1713void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
1714{
1715 LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
1716 /* Conditions */
1717 if (iSoMaxConn > SOMAXCONN)
1718 {
1719 LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
1720 iSoMaxConn = SOMAXCONN;
1721 }
1722
1723 if (iSoMaxConn < 1)
1724 {
1725 LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
1726 LogFlowFuncLeave();
1727 return;
1728 }
1729
1730 /* Asignment */
1731 if (pData->soMaxConn != iSoMaxConn)
1732 {
1733 LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
1734 pData->soMaxConn, iSoMaxConn));
1735 pData->soMaxConn = iSoMaxConn;
1736 }
1737 LogFlowFuncLeave();
1738}
1739/* don't allow user set less 8kB and more than 1M values */
1740#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
1741void slirp_set_rcvbuf(PNATState pData, int kilobytes)
1742{
1743 _8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
1744 pData->socket_rcv = kilobytes;
1745}
1746void slirp_set_sndbuf(PNATState pData, int kilobytes)
1747{
1748 _8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
1749 pData->socket_snd = kilobytes * _1K;
1750}
1751void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
1752{
1753 _8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
1754 tcp_rcvspace = kilobytes * _1K;
1755}
1756void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
1757{
1758 _8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
1759 tcp_sndspace = kilobytes * _1K;
1760}
1761
1762/*
1763 * Looking for Ether by ip in ARP-cache
1764 * Note: it´s responsible of caller to allocate buffer for result
1765 * @returns iprt status code
1766 */
1767int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
1768{
1769 struct arp_cache_entry *ac;
1770
1771 if (ether == NULL)
1772 return VERR_INVALID_PARAMETER;
1773
1774 if (LIST_EMPTY(&pData->arp_cache))
1775 return VERR_NOT_FOUND;
1776
1777 LIST_FOREACH(ac, &pData->arp_cache, list)
1778 {
1779 if ( ac->ip == ip
1780 && memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
1781 {
1782 memcpy(ether, ac->ether, ETH_ALEN);
1783 return VINF_SUCCESS;
1784 }
1785 }
1786 return VERR_NOT_FOUND;
1787}
1788
1789/*
1790 * Looking for IP by Ether in ARP-cache
1791 * Note: it´s responsible of caller to allocate buffer for result
1792 * @returns 0 - if found, 1 - otherwise
1793 */
1794int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t *ether, uint32_t *ip)
1795{
1796 struct arp_cache_entry *ac;
1797 *ip = INADDR_ANY;
1798
1799 if (LIST_EMPTY(&pData->arp_cache))
1800 return VERR_NOT_FOUND;
1801
1802 LIST_FOREACH(ac, &pData->arp_cache, list)
1803 {
1804 if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
1805 {
1806 *ip = ac->ip;
1807 return VINF_SUCCESS;
1808 }
1809 }
1810 return VERR_NOT_FOUND;
1811}
1812
1813void slirp_arp_who_has(PNATState pData, uint32_t dst)
1814{
1815 struct mbuf *m;
1816 struct ethhdr *ehdr;
1817 struct arphdr *ahdr;
1818 static bool fWarned = false;
1819 LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
1820
1821 /* ARP request WHO HAS 0.0.0.0 is one of the signals
1822 * that something has been broken at Slirp. Investigating
1823 * pcap dumps it's easy to miss warning ARP requests being
1824 * focused on investigation of other protocols flow.
1825 */
1826#ifdef DEBUG_vvl
1827 Assert((dst != INADDR_ANY));
1828 NOREF(fWarned);
1829#else
1830 if ( dst == INADDR_ANY
1831 && !fWarned)
1832 {
1833 LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
1834 fWarned = true;
1835 }
1836#endif /* !DEBUG_vvl */
1837
1838 m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
1839 if (m == NULL)
1840 {
1841 Log(("NAT: Can't alloc mbuf for ARP request\n"));
1842 LogFlowFuncLeave();
1843 return;
1844 }
1845 ehdr = mtod(m, struct ethhdr *);
1846 memset(ehdr->h_source, 0xff, ETH_ALEN);
1847 ahdr = (struct arphdr *)&ehdr[1];
1848 ahdr->ar_hrd = RT_H2N_U16_C(1);
1849 ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
1850 ahdr->ar_hln = ETH_ALEN;
1851 ahdr->ar_pln = 4;
1852 ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
1853 memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
1854 /* we assume that this request come from gw, but not from DNS or TFTP */
1855 ahdr->ar_sha[5] = CTL_ALIAS;
1856 *(uint32_t *)ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) | CTL_ALIAS);
1857 memset(ahdr->ar_tha, 0xff, ETH_ALEN); /*broadcast*/
1858 *(uint32_t *)ahdr->ar_tip = dst;
1859 /* warn!!! should falls in mbuf minimal size */
1860 m->m_len = sizeof(struct arphdr) + ETH_HLEN;
1861 m->m_data += ETH_HLEN;
1862 m->m_len -= ETH_HLEN;
1863 if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
1864 LogFlowFuncLeave();
1865}
1866#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
1867void slirp_add_host_resolver_mapping(PNATState pData, const char *pszHostName, const char *pszHostNamePattern, uint32_t u32HostIP)
1868{
1869 LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
1870 pszHostName ? pszHostName : "(null)",
1871 pszHostNamePattern ? pszHostNamePattern : "(null)",
1872 u32HostIP));
1873 if ( ( pszHostName
1874 || pszHostNamePattern)
1875 && u32HostIP != INADDR_ANY
1876 && u32HostIP != INADDR_BROADCAST)
1877 {
1878 PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
1879 if (!pDnsMapping)
1880 {
1881 LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
1882 LogFlowFuncLeave();
1883 return;
1884 }
1885 pDnsMapping->u32IpAddress = u32HostIP;
1886 if (pszHostName)
1887 pDnsMapping->pszCName = RTStrDup(pszHostName);
1888 else if (pszHostNamePattern)
1889 pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
1890 if ( !pDnsMapping->pszCName
1891 && !pDnsMapping->pszPattern)
1892 {
1893 LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
1894 RTMemFree(pDnsMapping);
1895 LogFlowFuncLeave();
1896 return;
1897 }
1898 LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
1899 LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
1900 pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
1901 pDnsMapping->u32IpAddress));
1902 }
1903 LogFlowFuncLeave();
1904}
1905#endif
1906
1907/* updates the arp cache
1908 * @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1909 * @returns 0 - if has found and updated
1910 * 1 - if hasn't found.
1911 */
1912static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
1913{
1914 struct arp_cache_entry *ac;
1915 Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1916 && memcmp(mac, zerro_ethaddr, ETH_ALEN)));
1917 LIST_FOREACH(ac, &pData->arp_cache, list)
1918 {
1919 if (!memcmp(ac->ether, mac, ETH_ALEN))
1920 {
1921 ac->ip = dst;
1922 return 0;
1923 }
1924 }
1925 return 1;
1926}
1927
1928/**
1929 * add entry to the arp cache
1930 * @note: this is helper function, slirp_arp_cache_update_or_add should be used.
1931 */
1932static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
1933{
1934 struct arp_cache_entry *ac = NULL;
1935 Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
1936 && memcmp(ether, zerro_ethaddr, ETH_ALEN)));
1937 ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
1938 if (ac == NULL)
1939 {
1940 Log(("NAT: Can't allocate arp cache entry\n"));
1941 return;
1942 }
1943 ac->ip = ip;
1944 memcpy(ac->ether, ether, ETH_ALEN);
1945 LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
1946}
1947
1948/* updates or adds entry to the arp cache
1949 * @returns 0 - if has found and updated
1950 * 1 - if hasn't found.
1951 */
1952int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
1953{
1954 if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
1955 || !memcmp(mac, zerro_ethaddr, ETH_ALEN))
1956 {
1957 static bool fBroadcastEtherAddReported;
1958 if (!fBroadcastEtherAddReported)
1959 {
1960 LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
1961 mac, dst));
1962 fBroadcastEtherAddReported = true;
1963 }
1964 return 1;
1965 }
1966 if (slirp_arp_cache_update(pData, dst, mac))
1967 slirp_arp_cache_add(pData, dst, mac);
1968
1969 return 0;
1970}
1971
1972
1973void slirp_set_mtu(PNATState pData, int mtu)
1974{
1975 if (mtu < 20 || mtu >= 16000)
1976 {
1977 LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
1978 mtu = 1500;
1979 }
1980 /* MTU is maximum transition unit on */
1981 if_mtu =
1982 if_mru = mtu;
1983}
1984
1985/**
1986 * Info handler.
1987 */
1988void slirp_info(PNATState pData, const void *pvArg, const char *pszArgs)
1989{
1990 struct socket *so, *so_next;
1991 struct arp_cache_entry *ac;
1992 struct port_forward_rule *rule;
1993 PCDBGFINFOHLP pHlp = (PCDBGFINFOHLP)pvArg;
1994 NOREF(pszArgs);
1995
1996 pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
1997 pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
1998 QSOCKET_FOREACH(so, so_next, tcp)
1999 /* { */
2000 pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2001 }
2002
2003 pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
2004 QSOCKET_FOREACH(so, so_next, udp)
2005 /* { */
2006 pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
2007 }
2008
2009 pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
2010 LIST_FOREACH(ac, &pData->arp_cache, list)
2011 {
2012 pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
2013 }
2014
2015 pHlp->pfnPrintf(pHlp, "NAT rules:\n");
2016 LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
2017 {
2018 pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
2019 rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
2020 rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
2021 rule->activated ? ' ' : '*');
2022 }
2023}
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