VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/slirp/slirp.c@ 16653

Last change on this file since 16653 was 16653, checked in by vboxsync, 16 years ago

NAT: fixed memmory corruption in new Unix multiplexing mechanism
  • Property svn:eol-style set to native
File size: 47.6 KB
Line 
1#include "slirp.h"
2#ifdef RT_OS_OS2
3# include <paths.h>
4#endif
5
6#include <VBox/err.h>
7#include <VBox/pdmdrv.h>
8#include <iprt/assert.h>
9#ifndef RT_OS_WINDOWS
10#include <poll.h>
11#endif
12
13#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) || !defined(RT_OS_WINDOWS)
14
15# ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
16# define DO_ENGAGE_EVENT1(so, fdset, label) \
17 do { \
18 FD_SET((so)->s, (fdset)); \
19 UPD_NFDS((so)->s); \
20 } while(0)
21
22
23# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
24 do { \
25 FD_SET((so)->s, (fdset1)); \
26 FD_SET((so)->s, (fdset2)); \
27 UPD_NFDS((so)->s); \
28 } while(0)
29
30# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
31
32# define DO_CHECK_FD_SET(so, events, fdset) (FD_ISSET((so)->s, fdset))
33# define DO_UNIX_CHECK_FD_SET(so, events, fdset ) 0 /*specific for Unix API */
34# else /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
35# define DO_ENGAGE_EVENT1(so, fdset, label) \
36 do { \
37 AssertRelease(poll_index < (nfds)); \
38 if( so->so_poll_index != -1 \
39 && so->s == polls[so->so_poll_index].fd) { \
40 polls[poll_index].events |= N_(fdset ## _poll); \
41 break; /* out of this loop */ \
42 } \
43 AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
44 polls[poll_index].fd = (so)->s; \
45 (so)->so_poll_index = poll_index; \
46 polls[poll_index].events = N_(fdset ## _poll); \
47 polls[poll_index].revents = 0; \
48 poll_index++; \
49 } while(0)
50
51
52# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
53 do { \
54 AssertRelease(poll_index < (nfds)); \
55 if( so->so_poll_index != -1 \
56 && so->s == polls[so->so_poll_index].fd) { \
57 polls[poll_index].events |= N_(fdset1 ## _poll) | N_(fdset1 ## _poll); \
58 break; /* out of this loop */ \
59 } \
60 polls[poll_index].fd = (so)->s; \
61 (so)->so_poll_index = poll_index; \
62 polls[poll_index].events = N_(fdset1 ## _poll) | N_(fdset1 ## _poll); \
63 poll_index++; \
64 } while(0)
65
66# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
67
68# define DO_CHECK_FD_SET(so, events, fdset) ( ((so)->so_poll_index != -1) \
69 && ((so)->so_poll_index <= ndfs) \
70 && ((so)->s == polls[so->so_poll_index].fd) \
71 && (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)))
72# define DO_UNIX_CHECK_FD_SET(so, events, fdset ) DO_CHECK_FD_SET((so), (events), fdset) /*specific for Unix API */
73# define DO_WIN_CHECK_FD_SET(so, events, fdset ) 0 /* specific for Windows Winsock API */
74# endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
75
76# ifndef RT_OS_WINDOWS
77
78# ifndef RT_OS_LINUX
79# define readfds_poll (POLLRDNORM)
80# define writefds_poll (POLLWRNORM)
81# define xfds_poll (POLLRDBAND|POLLWRBAND|POLLPRI)
82# else
83# define readfds_poll (POLLIN)
84# define writefds_poll (POLLOUT)
85# define xfds_poll (POLLPRI)
86# endif
87# define rderr_poll (POLLERR)
88# define rdhup_poll (POLLHUP)
89# define nval_poll (POLLNVAL)
90
91# define ICMP_ENGAGE_EVENT(so, fdset) \
92 do { \
93 if (pData->icmp_socket.s != -1) \
94 DO_ENGAGE_EVENT1((so), fdset, ICMP); \
95 } while (0)
96# else /* !RT_OS_WINDOWS */
97# define DO_WIN_CHECK_FD_SET(so, events, fdset ) DO_CHECK_FD_SET((so), (events), fdset)
98# define ICMP_ENGAGE_EVENT(so, fdset) do {} while(0)
99#endif /* RT_OS_WINDOWS */
100
101#else /* defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS) */
102
103/*
104 * On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
105 * So no call to WSAEventSelect necessary.
106 */
107# define ICMP_ENGAGE_EVENT(so, fdset) do {} while(0)
108
109# define DO_ENGAGE_EVENT1(so, fdset1, label) \
110 do { \
111 rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
112 if (rc == SOCKET_ERROR) \
113 { \
114 /* This should not happen */ \
115 error = WSAGetLastError(); \
116 LogRel(("WSAEventSelect (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
117 error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
118 } \
119 } while(0); \
120 CONTINUE(label)
121
122# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
123 DO_ENGAGE_EVENT1((so), (fdset1), label)
124
125# define DO_POLL_EVENTS(rc, error, so, events, label) \
126 (rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
127 if ((rc) == SOCKET_ERROR) \
128 { \
129 (error) = WSAGetLastError(); \
130 LogRel(("WSAEnumNetworkEvents " #label " error %d\n", (error))); \
131 CONTINUE(label); \
132 }
133
134# define acceptds_win FD_ACCEPT
135# define acceptds_win_bit FD_ACCEPT_BIT
136
137# define readfds_win FD_READ
138# define readfds_win_bit FD_READ_BIT
139
140# define writefds_win FD_WRITE
141# define writefds_win_bit FD_WRITE_BIT
142
143# define xfds_win FD_OOB
144# define xfds_win_bit FD_OOB_BIT
145
146# define DO_CHECK_FD_SET(so, events, fdset) \
147 (((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
148
149# define DO_WIN_CHECK_FD_SET(so, events, fdset ) DO_CHECK_FD_SET((so), (events), fdset)
150# define DO_UNIX_CHECK_FD_SET(so, events, fdset ) 1 /*specific for Unix API */
151
152#endif /* defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS) */
153
154#define TCP_ENGAGE_EVENT1(so, fdset) \
155 DO_ENGAGE_EVENT1((so), fdset, tcp)
156
157#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
158 DO_ENGAGE_EVENT2((so), fdset1, fdset2, tcp)
159
160#define UDP_ENGAGE_EVENT(so, fdset) \
161 DO_ENGAGE_EVENT1((so), fdset, udp)
162
163#define POLL_TCP_EVENTS(rc, error, so, events) \
164 DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
165
166#define POLL_UDP_EVENTS(rc, error, so, events) \
167 DO_POLL_EVENTS((rc), (error), (so), (events), udp)
168
169#define CHECK_FD_SET(so, events, set) \
170 (DO_CHECK_FD_SET((so), (events), set))
171
172#define WIN_CHECK_FD_SET(so, events, set) \
173 (DO_WIN_CHECK_FD_SET((so), (events), set))
174#define UNIX_CHECK_FD_SET(so, events, set) \
175 (DO_UNIX_CHECK_FD_SET(so, events, set))
176
177/*
178 * Loging macros
179 */
180#if VBOX_WITH_DEBUG_NAT_SOCKETS
181# if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
182# if defined(RT_OS_WINDOWS)
183# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
184 do { \
185 LogRel((" " #proto " %R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
186 } while (0)
187# else /* RT_OS_WINDOWS */
188# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
189 do { \
190 LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
191 CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
192 CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
193 CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
194 CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
195 CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
196 CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
197 } while (0)
198# endif /* !RT_OS_WINDOWS */
199# else /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
200# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
201 do { \
202 LogRel((" " #proto " %R[natsock] %s %s %s\n", (so), FD_ISSET((so)->s, (r_fdset))?"READ":"",\
203 FD_ISSET((so)->s, (w_fdset))?"WRITE":"", FD_ISSET((so)->s, (x_fdset))?"OOB":"")); \
204 } while (0)
205# endif
206#else /* VBOX_WITH_DEBUG_NAT_SOCKETS */
207# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
208#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
209
210#define LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) DO_LOG_NAT_SOCK((so), proto, (winevent), r_fdset, w_fdset, x_fdset)
211
212static const uint8_t special_ethaddr[6] =
213{
214 0x52, 0x54, 0x00, 0x12, 0x35, 0x00
215};
216
217#ifdef RT_OS_WINDOWS
218
219static int get_dns_addr_domain(PNATState pData, bool fVerbose,
220 struct in_addr *pdns_addr,
221 const char **ppszDomain)
222{
223 int rc = 0;
224 FIXED_INFO *FixedInfo = NULL;
225 ULONG BufLen;
226 DWORD ret;
227 IP_ADDR_STRING *pIPAddr;
228 struct in_addr tmp_addr;
229
230 FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
231 BufLen = sizeof(FIXED_INFO);
232
233 /** @todo: this API returns all DNS servers, no matter whether the
234 * corresponding network adapter is disabled or not. Maybe replace
235 * this by GetAdapterAddresses(), which is XP/Vista only though. */
236 if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen))
237 {
238 if (FixedInfo)
239 {
240 GlobalFree(FixedInfo);
241 FixedInfo = NULL;
242 }
243 FixedInfo = GlobalAlloc(GPTR, BufLen);
244 }
245
246 if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS)
247 {
248 Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
249 if (FixedInfo)
250 {
251 GlobalFree(FixedInfo);
252 FixedInfo = NULL;
253 }
254 rc = -1;
255 goto get_dns_prefix;
256 }
257
258#ifndef VBOX_WITH_MULTI_DNS
259 pIPAddr = &(FixedInfo->DnsServerList);
260 inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
261 Log(("nat: DNS Servers:\n"));
262 if (fVerbose || pdns_addr->s_addr != tmp_addr.s_addr)
263 LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
264 *pdns_addr = tmp_addr;
265
266 pIPAddr = FixedInfo -> DnsServerList.Next;
267 while (pIPAddr)
268 {
269 if (fVerbose)
270 LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
271 pIPAddr = pIPAddr ->Next;
272 }
273#else
274 /*localhost mask */
275 for (pIPAddr = &FixedInfo->DnsServerList; pIPAddr != NULL; pIPAddr = pIPAddr->Next)
276 {
277 struct dns_entry *da;
278 if(!inet_aton(pIPAddr->IpAddress.String, &tmp_addr))
279 continue;
280 da = RTMemAllocZ(sizeof (struct dns_entry));
281 if (da == NULL)
282 {
283 LogRel(("can't alloc memory for DNS entry\n"));
284 return -1;
285 }
286 /*check */
287 if ((da->de_addr.s_addr & htonl(IN_CLASSA_NET)) == ntohl(INADDR_LOOPBACK & IN_CLASSA_NET)) {
288 da->de_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
289 }
290 LIST_INSERT_HEAD(&pData->dns_list_head, da, de_list);
291 }
292#endif
293 if (FixedInfo)
294 {
295 GlobalFree(FixedInfo);
296 FixedInfo = NULL;
297 }
298
299get_dns_prefix:
300 if (ppszDomain)
301 {
302 OSVERSIONINFO ver;
303 char szDnsDomain[256];
304 DWORD dwSize = sizeof(szDnsDomain);
305
306 *ppszDomain = NULL;
307 GetVersionEx(&ver);
308 if (ver.dwMajorVersion >= 5)
309 {
310 /* GetComputerNameEx exists in Windows versions starting with 2000. */
311 if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
312 {
313 if (szDnsDomain[0])
314 {
315 /* Just non-empty strings are valid. */
316 *ppszDomain = RTStrDup(szDnsDomain);
317 if (pData->fPassDomain)
318 {
319 if (fVerbose)
320 LogRel(("NAT: passing domain name %s\n", szDnsDomain));
321 }
322 else
323 Log(("nat: ignoring domain %s\n", szDnsDomain));
324 }
325 }
326 else
327 Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
328 }
329 }
330 return rc;
331}
332
333#else
334
335static int get_dns_addr_domain(PNATState pData, bool fVerbose,
336 struct in_addr *pdns_addr,
337 const char **ppszDomain)
338{
339 char buff[512];
340 char buff2[256];
341 FILE *f;
342 int found = 0;
343 struct in_addr tmp_addr;
344
345#ifdef RT_OS_OS2
346 /* Try various locations. */
347 char *etc = getenv("ETC");
348 f = NULL;
349 if (etc)
350 {
351 snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
352 f = fopen(buff, "rt");
353 }
354 if (!f)
355 {
356 snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
357 f = fopen(buff, "rt");
358 }
359 if (!f)
360 {
361 snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
362 f = fopen(buff, "rt");
363 }
364#else
365 f = fopen("/etc/resolv.conf", "r");
366#endif
367 if (!f)
368 return -1;
369
370 if (ppszDomain)
371 *ppszDomain = NULL;
372 Log(("nat: DNS Servers:\n"));
373 while (fgets(buff, 512, f) != NULL)
374 {
375#ifdef VBOX_WITH_MULTI_DNS
376 struct dns_entry *da = NULL;
377#endif
378 if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1)
379 {
380 if (!inet_aton(buff2, &tmp_addr))
381 continue;
382#ifndef VBOX_WITH_MULTI_DNS
383 /* If it's the first one, set it to dns_addr */
384 if (!found)
385 {
386 if (fVerbose || pdns_addr->s_addr != tmp_addr.s_addr)
387 LogRel(("NAT: DNS address: %s\n", buff2));
388 *pdns_addr = tmp_addr;
389 }
390 else
391 {
392 if (fVerbose)
393 LogRel(("NAT: ignored DNS address: %s\n", buff2));
394 }
395#else
396 /*localhost mask */
397 da = RTMemAllocZ(sizeof (struct dns_entry));
398 if (da == NULL)
399 {
400 LogRel(("can't alloc memory for DNS entry\n"));
401 return -1;
402 }
403 /*check */
404 da->de_addr.s_addr = tmp_addr.s_addr;
405 if ((da->de_addr.s_addr & htonl(IN_CLASSA_NET)) == ntohl(INADDR_LOOPBACK & IN_CLASSA_NET)) {
406 da->de_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
407 }
408 LIST_INSERT_HEAD(&pData->dns_list_head, da, de_list);
409#endif
410 found++;
411 }
412 if ( ppszDomain
413 && (!strncmp(buff, "domain", 6) || !strncmp(buff, "search", 6)))
414 {
415 /* Domain name/search list present. Pick first entry */
416 if (*ppszDomain == NULL)
417 {
418 char *tok;
419 char *saveptr;
420 tok = strtok_r(&buff[6], " \t\n", &saveptr);
421 if (tok)
422 {
423 *ppszDomain = RTStrDup(tok);
424 if (pData->fPassDomain)
425 {
426 if (fVerbose)
427 LogRel(("NAT: passing domain name %s\n", tok));
428 }
429 else
430 Log(("nat: ignoring domain %s\n", tok));
431 }
432 }
433 }
434 }
435 fclose(f);
436 if (!found)
437 return -1;
438 return 0;
439}
440
441#endif
442
443int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
444{
445 return get_dns_addr_domain(pData, false, pdns_addr, NULL);
446}
447
448int slirp_init(PNATState *ppData, const char *pszNetAddr, uint32_t u32Netmask,
449 bool fPassDomain, const char *pszTFTPPrefix,
450 const char *pszBootFile, void *pvUser)
451{
452 int fNATfailed = 0;
453 int rc;
454 PNATState pData = RTMemAllocZ(sizeof(NATState));
455 *ppData = pData;
456 if (!pData)
457 return VERR_NO_MEMORY;
458 if (u32Netmask & 0x1f)
459 /* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
460 return VERR_INVALID_PARAMETER;
461 memset(pData, '\0', sizeof(NATState));
462 pData->fPassDomain = fPassDomain;
463 pData->pvUser = pvUser;
464 tftp_prefix = pszTFTPPrefix;
465 bootp_filename = pszBootFile;
466 pData->netmask = u32Netmask;
467
468#ifdef RT_OS_WINDOWS
469 {
470 WSADATA Data;
471 WSAStartup(MAKEWORD(2,0), &Data);
472 }
473# if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
474 pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
475# endif
476#endif
477#ifdef VBOX_WITH_SLIRP_MT
478 QSOCKET_LOCK_CREATE(tcb);
479 QSOCKET_LOCK_CREATE(udb);
480 rc = RTReqCreateQueue(&pData->pReqQueue);
481 AssertReleaseRC(rc);
482#endif
483
484 link_up = 1;
485
486 debug_init();
487 if_init(pData);
488 ip_init(pData);
489 icmp_init(pData);
490
491 /* Initialise mbufs *after* setting the MTU */
492 m_init(pData);
493
494 inet_aton(pszNetAddr, &special_addr);
495 alias_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS);
496 /* @todo: add ability to configure this staff */
497 pData->tftp_server.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_TFTP);
498
499 /* set default addresses */
500 inet_aton("127.0.0.1", &loopback_addr);
501#ifndef VBOX_WITH_MULTI_DNS
502 inet_aton("127.0.0.1", &dns_addr);
503
504 if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
505#else
506 LIST_INIT(&pData->dns_list_head);
507 if (get_dns_addr_domain(pData, true, NULL, &pData->pszDomain) < 0)
508#endif
509 fNATfailed = 1;
510
511 getouraddr(pData);
512 return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
513}
514
515/**
516 * Statistics counters.
517 */
518void slirp_register_timers(PNATState pData, PPDMDRVINS pDrvIns)
519{
520#ifdef VBOX_WITH_STATISTICS
521 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFill, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
522 STAMUNIT_TICKS_PER_CALL, "Profiling slirp fills", "/Drivers/NAT%d/Fill", pDrvIns->iInstance);
523 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPoll, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
524 STAMUNIT_TICKS_PER_CALL, "Profiling slirp polls", "/Drivers/NAT%d/Poll", pDrvIns->iInstance);
525 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFastTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
526 STAMUNIT_TICKS_PER_CALL, "Profiling slirp fast timer", "/Drivers/NAT%d/TimerFast", pDrvIns->iInstance);
527 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatSlowTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
528 STAMUNIT_TICKS_PER_CALL, "Profiling slirp slow timer", "/Drivers/NAT%d/TimerSlow", pDrvIns->iInstance);
529 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
530 STAMUNIT_COUNT, "TCP sockets", "/Drivers/NAT%d/SockTCP", pDrvIns->iInstance);
531 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
532 STAMUNIT_COUNT, "TCP sockets active", "/Drivers/NAT%d/SockTCPHot", pDrvIns->iInstance);
533 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
534 STAMUNIT_COUNT, "UDP sockets", "/Drivers/NAT%d/SockUDP", pDrvIns->iInstance);
535 PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
536 STAMUNIT_COUNT, "UDP sockets active", "/Drivers/NAT%d/SockUDPHot", pDrvIns->iInstance);
537#endif /* VBOX_WITH_STATISTICS */
538}
539
540/**
541 * Marks the link as up, making it possible to establish new connections.
542 */
543void slirp_link_up(PNATState pData)
544{
545 link_up = 1;
546}
547
548/**
549 * Marks the link as down and cleans up the current connections.
550 */
551void slirp_link_down(PNATState pData)
552{
553 struct socket *so;
554
555 while ((so = tcb.so_next) != &tcb)
556 {
557 if (so->so_state & SS_NOFDREF || so->s == -1)
558 sofree(pData, so);
559 else
560 tcp_drop(pData, sototcpcb(so), 0);
561 }
562
563 while ((so = udb.so_next) != &udb)
564 udp_detach(pData, so);
565
566 link_up = 0;
567}
568
569/**
570 * Terminates the slirp component.
571 */
572void slirp_term(PNATState pData)
573{
574#ifdef VBOX_WITH_MULTI_DNS
575 struct dns_entry *de = NULL;
576#endif
577 if (pData->pszDomain)
578 RTStrFree((char *)(void *)pData->pszDomain);
579
580#ifdef RT_OS_WINDOWS
581 pData->pfIcmpCloseHandle(pData->icmp_socket.sh);
582 FreeLibrary(pData->hmIcmpLibrary);
583 RTMemFree(pData->pvIcmpBuffer);
584# else
585 closesocket(pData->icmp_socket.s);
586#endif
587
588 slirp_link_down(pData);
589#ifdef VBOX_WITH_MULTI_DNS
590 while(!LIST_EMPTY(&pData->dns_list_head)) {
591 de = LIST_FIRST(&pData->dns_list_head);
592 LIST_REMOVE(de, de_list);
593 RTMemFree(de);
594 }
595#endif
596#ifdef RT_OS_WINDOWS
597 WSACleanup();
598#endif
599#ifdef LOG_ENABLED
600 Log(("\n"
601 "NAT statistics\n"
602 "--------------\n"
603 "\n"));
604 ipstats(pData);
605 tcpstats(pData);
606 udpstats(pData);
607 icmpstats(pData);
608 mbufstats(pData);
609 sockstats(pData);
610 Log(("\n"
611 "\n"
612 "\n"));
613#endif
614 RTMemFree(pData);
615}
616
617
618#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
619#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
620#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
621
622/*
623 * curtime kept to an accuracy of 1ms
624 */
625#ifdef RT_OS_WINDOWS
626static void updtime(PNATState pData)
627{
628 struct _timeb tb;
629
630 _ftime(&tb);
631 curtime = (u_int)tb.time * (u_int)1000;
632 curtime += (u_int)tb.millitm;
633}
634#else
635static void updtime(PNATState pData)
636{
637 gettimeofday(&tt, 0);
638
639 curtime = (u_int)tt.tv_sec * (u_int)1000;
640 curtime += (u_int)tt.tv_usec / (u_int)1000;
641
642 if ((tt.tv_usec % 1000) >= 500)
643 curtime++;
644}
645#endif
646
647#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
648void slirp_select_fill(PNATState pData, int *pnfds,
649 fd_set *readfds, fd_set *writefds, fd_set *xfds)
650#else /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
651# ifdef RT_OS_WINDOWS
652void slirp_select_fill(PNATState pData, int *pnfds)
653# else /* RT_OS_WINDOWS */
654void slirp_select_fill(PNATState pData, int *pnfds, struct pollfd *polls)
655# endif /* !RT_OS_WINDOWS */
656#endif /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
657{
658 struct socket *so, *so_next;
659 int nfds;
660#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
661 int rc;
662 int error;
663#endif
664#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && !defined(RT_OS_WINDOWS)
665 int poll_index = 0;
666#endif
667 int i;
668
669 STAM_PROFILE_START(&pData->StatFill, a);
670
671 nfds = *pnfds;
672
673 /*
674 * First, TCP sockets
675 */
676 do_slowtimo = 0;
677 if (link_up)
678 {
679 /*
680 * *_slowtimo needs calling if there are IP fragments
681 * in the fragment queue, or there are TCP connections active
682 */
683 /* XXX:
684 * triggering of fragment expiration should be the same but use new macroses
685 */
686 do_slowtimo = (tcb.so_next != &tcb);
687 if (!do_slowtimo)
688 {
689 for (i = 0; i < IPREASS_NHASH; i++)
690 {
691 if (!TAILQ_EMPTY(&ipq[i]))
692 {
693 do_slowtimo = 1;
694 break;
695 }
696 }
697 }
698 ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
699
700 STAM_COUNTER_RESET(&pData->StatTCP);
701 STAM_COUNTER_RESET(&pData->StatTCPHot);
702
703 QSOCKET_FOREACH(so, so_next, tcp)
704 /* { */
705#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && !defined(RT_OS_WINDOWS)
706 so->so_poll_index = -1;
707#endif
708 STAM_COUNTER_INC(&pData->StatTCP);
709
710 /*
711 * See if we need a tcp_fasttimo
712 */
713 if ( time_fasttimo == 0
714 && so->so_tcpcb != NULL
715 && so->so_tcpcb->t_flags & TF_DELACK)
716 time_fasttimo = curtime; /* Flag when we want a fasttimo */
717
718 /*
719 * NOFDREF can include still connecting to local-host,
720 * newly socreated() sockets etc. Don't want to select these.
721 */
722 if (so->so_state & SS_NOFDREF || so->s == -1)
723 CONTINUE(tcp);
724
725 /*
726 * Set for reading sockets which are accepting
727 */
728 if (so->so_state & SS_FACCEPTCONN)
729 {
730 STAM_COUNTER_INC(&pData->StatTCPHot);
731 TCP_ENGAGE_EVENT1(so, readfds);
732 CONTINUE(tcp);
733 }
734
735 /*
736 * Set for writing sockets which are connecting
737 */
738 if (so->so_state & SS_ISFCONNECTING)
739 {
740 Log2(("connecting %R[natsock] engaged\n",so));
741 STAM_COUNTER_INC(&pData->StatTCPHot);
742 TCP_ENGAGE_EVENT1(so, writefds);
743 }
744
745 /*
746 * Set for writing if we are connected, can send more, and
747 * we have something to send
748 */
749 if (CONN_CANFSEND(so) && so->so_rcv.sb_cc)
750 {
751 STAM_COUNTER_INC(&pData->StatTCPHot);
752 TCP_ENGAGE_EVENT1(so, writefds);
753 }
754
755 /*
756 * Set for reading (and urgent data) if we are connected, can
757 * receive more, and we have room for it XXX /2 ?
758 */
759 if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2)))
760 {
761 STAM_COUNTER_INC(&pData->StatTCPHot);
762 TCP_ENGAGE_EVENT2(so, readfds, xfds);
763 }
764 LOOP_LABEL(tcp, so, so_next);
765 }
766
767 /*
768 * UDP sockets
769 */
770 STAM_COUNTER_RESET(&pData->StatUDP);
771 STAM_COUNTER_RESET(&pData->StatUDPHot);
772
773 QSOCKET_FOREACH(so, so_next, udp)
774 /* { */
775
776 STAM_COUNTER_INC(&pData->StatUDP);
777#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && !defined(RT_OS_WINDOWS)
778 so->so_poll_index = -1;
779#endif
780
781 /*
782 * See if it's timed out
783 */
784 if (so->so_expire)
785 {
786 if (so->so_expire <= curtime)
787 {
788#ifdef VBOX_WITH_SLIRP_MT
789 /* we need so_next for continue our cycle*/
790 so_next = so->so_next;
791#endif
792 UDP_DETACH(pData, so, so_next);
793 CONTINUE_NO_UNLOCK(udp);
794 }
795 else
796 do_slowtimo = 1; /* Let socket expire */
797 }
798
799 /*
800 * When UDP packets are received from over the link, they're
801 * sendto()'d straight away, so no need for setting for writing
802 * Limit the number of packets queued by this session to 4.
803 * Note that even though we try and limit this to 4 packets,
804 * the session could have more queued if the packets needed
805 * to be fragmented.
806 *
807 * (XXX <= 4 ?)
808 */
809 if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
810 {
811 STAM_COUNTER_INC(&pData->StatUDPHot);
812 UDP_ENGAGE_EVENT(so, readfds);
813 }
814 LOOP_LABEL(udp, so, so_next);
815 }
816
817 }
818
819#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
820# if defined(RT_OS_WINDOWS)
821 *pnfds = VBOX_EVENT_COUNT;
822# else /* RT_OS_WINDOWS */
823 AssertRelease(poll_index <= *pnfds);
824 *pnfds = poll_index;
825# endif /* !RT_OS_WINDOWS */
826#else /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
827 *pnfds = nfds;
828#endif /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
829
830 STAM_PROFILE_STOP(&pData->StatFill, a);
831}
832
833#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
834# if defined(RT_OS_WINDOWS)
835void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
836# else /* RT_OS_WINDOWS */
837void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
838# endif /* !RT_OS_WINDOWS */
839#else /* VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
840void slirp_select_poll(PNATState pData, fd_set *readfds, fd_set *writefds, fd_set *xfds)
841#endif /* !VBOX_WITH_SIMPLIFIED_SLIRP_SYNC */
842{
843 struct socket *so, *so_next;
844 int ret;
845#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
846 WSANETWORKEVENTS NetworkEvents;
847 int rc;
848 int error;
849#endif
850#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && !defined(RT_OS_WINDOWS)
851 int poll_index = 0;
852#endif
853
854 STAM_PROFILE_START(&pData->StatPoll, a);
855
856 /* Update time */
857 updtime(pData);
858
859 /*
860 * See if anything has timed out
861 */
862 if (link_up)
863 {
864 if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
865 {
866 STAM_PROFILE_START(&pData->StatFastTimer, a);
867 tcp_fasttimo(pData);
868 time_fasttimo = 0;
869 STAM_PROFILE_STOP(&pData->StatFastTimer, a);
870 }
871 if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
872 {
873 STAM_PROFILE_START(&pData->StatSlowTimer, a);
874 ip_slowtimo(pData);
875 tcp_slowtimo(pData);
876 last_slowtimo = curtime;
877 STAM_PROFILE_STOP(&pData->StatSlowTimer, a);
878 }
879 }
880#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
881 if (fTimeout)
882 return; /* only timer update */
883#endif
884
885 /*
886 * Check sockets
887 */
888 if (link_up)
889 {
890#if defined(RT_OS_WINDOWS)
891 /*XXX: before renaming please make see define
892 * fIcmp in slirp_state.h
893 */
894 if (fIcmp)
895 sorecvfrom(pData, &pData->icmp_socket);
896#else
897 if ( (pData->icmp_socket.s != -1)
898 && CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
899 sorecvfrom(pData, &pData->icmp_socket);
900#endif
901 /*
902 * Check TCP sockets
903 */
904 QSOCKET_FOREACH(so, so_next, tcp)
905 /* { */
906
907#ifdef VBOX_WITH_SLIRP_MT
908 if ( so->so_state & SS_NOFDREF
909 && so->so_deleted == 1)
910 {
911 struct socket *son, *sop = NULL;
912 QSOCKET_LOCK(tcb);
913 if (so->so_next != NULL)
914 {
915 if (so->so_next != &tcb)
916 SOCKET_LOCK(so->so_next);
917 son = so->so_next;
918 }
919 if ( so->so_prev != &tcb
920 && so->so_prev != NULL)
921 {
922 SOCKET_LOCK(so->so_prev);
923 sop = so->so_prev;
924 }
925 QSOCKET_UNLOCK(tcb);
926 remque(pData, so);
927 NSOCK_DEC();
928 SOCKET_UNLOCK(so);
929 SOCKET_LOCK_DESTROY(so);
930 RTMemFree(so);
931 so_next = son;
932 if (sop != NULL)
933 SOCKET_UNLOCK(sop);
934 CONTINUE_NO_UNLOCK(tcp);
935 }
936#endif
937 /*
938 * FD_ISSET is meaningless on these sockets
939 * (and they can crash the program)
940 */
941 if (so->so_state & SS_NOFDREF || so->s == -1)
942 CONTINUE(tcp);
943
944 POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
945
946 LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
947
948
949 /*
950 * Check for URG data
951 * This will soread as well, so no need to
952 * test for readfds below if this succeeds
953 */
954
955 /* out-of-band data */
956 if (CHECK_FD_SET(so, NetworkEvents, xfds))
957 {
958 sorecvoob(pData, so);
959 }
960
961 /*
962 * Check sockets for reading
963 */
964 else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
965 || WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
966 {
967 /*
968 * Check for incoming connections
969 */
970 if (so->so_state & SS_FACCEPTCONN)
971 {
972 TCP_CONNECT(pData, so);
973#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
974 if (!(NetworkEvents.lNetworkEvents & FD_CLOSE))
975#endif
976 CONTINUE(tcp);
977 }
978
979 ret = soread(pData, so);
980 /* Output it if we read something */
981 if (ret > 0)
982 TCP_OUTPUT(pData, sototcpcb(so));
983 }
984
985#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
986 /*
987 * Check for FD_CLOSE events.
988 */
989 if (NetworkEvents.lNetworkEvents & FD_CLOSE)
990 {
991 /*
992 * drain the socket
993 */
994 for (;;)
995 {
996 ret = soread(pData, so);
997 if (ret > 0)
998 TCP_OUTPUT(pData, sototcpcb(so));
999 else
1000 break;
1001 }
1002 }
1003#endif
1004
1005 /*
1006 * Check sockets for writing
1007 */
1008 if (CHECK_FD_SET(so, NetworkEvents, writefds))
1009 {
1010 /*
1011 * Check for non-blocking, still-connecting sockets
1012 */
1013 if (so->so_state & SS_ISFCONNECTING)
1014 {
1015 Log2(("connecting %R[natsock] catched\n", so));
1016 /* Connected */
1017 so->so_state &= ~SS_ISFCONNECTING;
1018
1019 /*
1020 * This should be probably guarded by PROBE_CONN too. Anyway,
1021 * we disable it on OS/2 because the below send call returns
1022 * EFAULT which causes the opened TCP socket to close right
1023 * after it has been opened and connected.
1024 */
1025#ifndef RT_OS_OS2
1026 ret = send(so->s, (const char *)&ret, 0, 0);
1027 if (ret < 0)
1028 {
1029 /* XXXXX Must fix, zero bytes is a NOP */
1030 if ( errno == EAGAIN
1031 || errno == EWOULDBLOCK
1032 || errno == EINPROGRESS
1033 || errno == ENOTCONN)
1034 CONTINUE(tcp);
1035
1036 /* else failed */
1037 so->so_state = SS_NOFDREF;
1038 }
1039 /* else so->so_state &= ~SS_ISFCONNECTING; */
1040#endif
1041
1042 /*
1043 * Continue tcp_input
1044 */
1045 TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
1046 /* continue; */
1047 }
1048 else
1049 SOWRITE(ret, pData, so);
1050 /*
1051 * XXX If we wrote something (a lot), there could be the need
1052 * for a window update. In the worst case, the remote will send
1053 * a window probe to get things going again.
1054 */
1055 }
1056
1057 /*
1058 * Probe a still-connecting, non-blocking socket
1059 * to check if it's still alive
1060 */
1061#ifdef PROBE_CONN
1062 if (so->so_state & SS_ISFCONNECTING)
1063 {
1064 ret = recv(so->s, (char *)&ret, 0, 0);
1065
1066 if (ret < 0)
1067 {
1068 /* XXX */
1069 if ( errno == EAGAIN
1070 || errno == EWOULDBLOCK
1071 || errno == EINPROGRESS
1072 || errno == ENOTCONN)
1073 {
1074 CONTINUE(tcp); /* Still connecting, continue */
1075 }
1076
1077 /* else failed */
1078 so->so_state = SS_NOFDREF;
1079
1080 /* tcp_input will take care of it */
1081 }
1082 else
1083 {
1084 ret = send(so->s, &ret, 0, 0);
1085 if (ret < 0)
1086 {
1087 /* XXX */
1088 if ( errno == EAGAIN
1089 || errno == EWOULDBLOCK
1090 || errno == EINPROGRESS
1091 || errno == ENOTCONN)
1092 {
1093 CONTINUE(tcp);
1094 }
1095 /* else failed */
1096 so->so_state = SS_NOFDREF;
1097 }
1098 else
1099 so->so_state &= ~SS_ISFCONNECTING;
1100
1101 }
1102 TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
1103 } /* SS_ISFCONNECTING */
1104#endif
1105#ifndef RT_OS_WINDOWS
1106 if ( UNIX_CHECK_FD_SET(so, NetworkEvents, rdhup)
1107 && UNIX_CHECK_FD_SET(so, NetworkEvents, rderr))
1108 {
1109 if (so->so_state & SS_ISFCONNECTING)
1110 {
1111 so->so_state = SS_NOFDREF;
1112 TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
1113 CONTINUE(tcp);
1114 }
1115 /* Here should be other error handlings */
1116 AssertRelease(!"shouldn't be here!!!");
1117 }
1118#endif
1119 LOOP_LABEL(tcp, so, so_next);
1120 }
1121
1122 /*
1123 * Now UDP sockets.
1124 * Incoming packets are sent straight away, they're not buffered.
1125 * Incoming UDP data isn't buffered either.
1126 */
1127 QSOCKET_FOREACH(so, so_next, udp)
1128 /* { */
1129#ifdef VBOX_WITH_SLIRP_MT
1130 if ( so->so_state & SS_NOFDREF
1131 && so->so_deleted == 1)
1132 {
1133 struct socket *son, *sop = NULL;
1134 QSOCKET_LOCK(udb);
1135 if (so->so_next != NULL)
1136 {
1137 if (so->so_next != &udb)
1138 SOCKET_LOCK(so->so_next);
1139 son = so->so_next;
1140 }
1141 if ( so->so_prev != &udb
1142 && so->so_prev != NULL)
1143 {
1144 SOCKET_LOCK(so->so_prev);
1145 sop = so->so_prev;
1146 }
1147 QSOCKET_UNLOCK(udb);
1148 remque(pData, so);
1149 NSOCK_DEC();
1150 SOCKET_UNLOCK(so);
1151 SOCKET_LOCK_DESTROY(so);
1152 RTMemFree(so);
1153 so_next = son;
1154 if (sop != NULL)
1155 SOCKET_UNLOCK(sop);
1156 CONTINUE_NO_UNLOCK(udp);
1157 }
1158#endif
1159 POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
1160
1161 LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
1162
1163 if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
1164 {
1165 SORECVFROM(pData, so);
1166 }
1167 LOOP_LABEL(udp, so, so_next);
1168 }
1169
1170 }
1171
1172#ifndef VBOX_WITH_SLIRP_MT
1173 /*
1174 * See if we can start outputting
1175 */
1176 if (if_queued && link_up)
1177 if_start(pData);
1178#endif
1179
1180 STAM_PROFILE_STOP(&pData->StatPoll, a);
1181}
1182
1183#define ETH_ALEN 6
1184#define ETH_HLEN 14
1185
1186#define ARPOP_REQUEST 1 /* ARP request */
1187#define ARPOP_REPLY 2 /* ARP reply */
1188
1189struct ethhdr
1190{
1191 unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
1192 unsigned char h_source[ETH_ALEN]; /* source ether addr */
1193 unsigned short h_proto; /* packet type ID field */
1194};
1195
1196struct arphdr
1197{
1198 unsigned short ar_hrd; /* format of hardware address */
1199 unsigned short ar_pro; /* format of protocol address */
1200 unsigned char ar_hln; /* length of hardware address */
1201 unsigned char ar_pln; /* length of protocol address */
1202 unsigned short ar_op; /* ARP opcode (command) */
1203
1204 /*
1205 * Ethernet looks like this : This bit is variable sized however...
1206 */
1207 unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
1208 unsigned char ar_sip[4]; /* sender IP address */
1209 unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
1210 unsigned char ar_tip[4]; /* target IP address */
1211};
1212
1213static
1214#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1215void arp_input(PNATState pData, struct mbuf *m)
1216#else
1217void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
1218#endif
1219{
1220 struct ethhdr *eh;
1221 struct ethhdr *reh;
1222 struct arphdr *ah;
1223 struct arphdr *rah;
1224 int ar_op;
1225 struct ex_list *ex_ptr;
1226 uint32_t htip;
1227#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1228 uint8_t arp_reply[sizeof(struct arphdr) + ETH_HLEN];
1229 eh = (struct ethhdr *)pkt;
1230#else
1231 struct mbuf *mr;
1232 eh = mtod(m, struct ethhdr *);
1233#endif
1234 ah = (struct arphdr *)&eh[1];
1235 htip = ntohl(*(uint32_t*)ah->ar_tip);
1236
1237#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1238 mr = m_get(pData);
1239 mr->m_data += if_maxlinkhdr;
1240 mr->m_len = sizeof(struct arphdr);
1241 rah = mtod(mr, struct arphdr *);
1242#else
1243 reh = (struct ethhdr *)arp_reply;
1244 rah = (struct arphdr *)&reh[1];
1245#endif
1246
1247 ar_op = ntohs(ah->ar_op);
1248 switch(ar_op)
1249 {
1250 case ARPOP_REQUEST:
1251 if ((htip & pData->netmask) == ntohl(special_addr.s_addr))
1252 {
1253 if ( CTL_CHECK(htip,CTL_DNS)
1254 || CTL_CHECK(htip, CTL_ALIAS)
1255 || CTL_CHECK(htip, CTL_TFTP))
1256 goto arp_ok;
1257 for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
1258 {
1259 if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
1260 goto arp_ok;
1261 }
1262 return;
1263 arp_ok:
1264
1265#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1266 memcpy(reh->h_dest, eh->h_source, ETH_ALEN);
1267 memcpy(reh->h_source, &special_addr, ETH_ALEN);
1268 reh->h_source[5] = ah->ar_tip[3];
1269 reh->h_proto = htons(ETH_P_ARP);
1270#endif
1271 rah->ar_hrd = htons(1);
1272 rah->ar_pro = htons(ETH_P_IP);
1273 rah->ar_hln = ETH_ALEN;
1274 rah->ar_pln = 4;
1275 rah->ar_op = htons(ARPOP_REPLY);
1276 memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN);
1277
1278 switch (htip & ~pData->netmask)
1279 {
1280 case CTL_DNS:
1281 case CTL_ALIAS:
1282 rah->ar_sha[5] = (uint8_t)(htip & ~pData->netmask);
1283 break;
1284 default:;
1285 }
1286
1287 memcpy(rah->ar_sip, ah->ar_tip, 4);
1288 memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
1289 memcpy(rah->ar_tip, ah->ar_sip, 4);
1290#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1291 if_encap(pData, ETH_P_ARP, mr);
1292 m_free(pData, m);
1293#else
1294 slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
1295#endif
1296 }
1297 break;
1298 default:
1299 break;
1300 }
1301}
1302
1303void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
1304{
1305 struct mbuf *m;
1306 int proto;
1307 static bool fWarnedIpv6;
1308
1309 if (pkt_len < ETH_HLEN)
1310 {
1311 LogRel(("NAT: packet having size %d has been ingnored\n", pkt_len));
1312 return;
1313 }
1314
1315 m = m_get(pData);
1316 if (!m)
1317 {
1318 LogRel(("can't allocate new mbuf\n"));
1319 return;
1320 }
1321
1322 /* Note: we add to align the IP header */
1323
1324 if (M_FREEROOM(m) < pkt_len)
1325 m_inc(m, pkt_len);
1326
1327 m->m_len = pkt_len ;
1328 memcpy(m->m_data, pkt, pkt_len);
1329
1330 proto = ntohs(*(uint16_t *)(pkt + 12));
1331 switch(proto)
1332 {
1333 case ETH_P_ARP:
1334#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1335 arp_input(pData, m);
1336#else
1337 arp_input(pData, pkt, pkt_len);
1338 m_free(pData, m);
1339#endif
1340 break;
1341 case ETH_P_IP:
1342 /* Update time. Important if the network is very quiet, as otherwise
1343 * the first outgoing connection gets an incorrect timestamp. */
1344 updtime(pData);
1345 m->m_data += ETH_HLEN;
1346 m->m_len -= ETH_HLEN;
1347 ip_input(pData, m);
1348 break;
1349 case ETH_P_IPV6:
1350 m_free(pData, m);
1351 if (!fWarnedIpv6)
1352 {
1353 LogRel(("NAT: IPv6 not supported\n"));
1354 fWarnedIpv6 = true;
1355 }
1356 break;
1357 default:
1358 LogRel(("NAT: Unsupported protocol %x\n", proto));
1359 m_free(pData, m);
1360 break;
1361 }
1362 RTMemFree((void *)pkt);
1363}
1364
1365/* output the IP packet to the ethernet device */
1366#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1367void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m)
1368#else
1369void if_encap(PNATState pData, uint8_t *ip_data, int ip_data_len)
1370#endif
1371{
1372#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1373 struct ethhdr *eh;
1374 uint8_t *buf = RTMemAlloc(1600);
1375 m->m_data -= if_maxlinkhdr;
1376 m->m_len += ETH_HLEN;
1377 eh = mtod(m, struct ethhdr *);
1378#else
1379 uint8_t buf[1600];
1380 struct ethhdr *eh = (struct ethhdr *)buf;
1381
1382 if (ip_data_len + ETH_HLEN > sizeof(buf))
1383 return;
1384
1385 memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
1386#endif
1387
1388
1389 memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
1390 memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
1391 /* XXX: not correct */
1392 eh->h_source[5] = CTL_ALIAS;
1393#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
1394 eh->h_proto = htons(eth_proto);
1395#if 0
1396 slirp_output(pData->pvUser, m, mtod(m, uint8_t *), m->m_len);
1397#else
1398 memcpy(buf, mtod(m, uint8_t *), m->m_len);
1399 slirp_output(pData->pvUser, NULL, buf, m->m_len);
1400 m_free(pData, m);
1401#endif
1402#else
1403 eh->h_proto = htons(ETH_P_IP);
1404 slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
1405#endif
1406}
1407
1408int slirp_redir(PNATState pData, int is_udp, int host_port,
1409 struct in_addr guest_addr, int guest_port)
1410{
1411 if (is_udp)
1412 {
1413 if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
1414 htons(guest_port), 0))
1415 return -1;
1416 }
1417 else
1418 {
1419 if (!solisten(pData, htons(host_port), guest_addr.s_addr,
1420 htons(guest_port), 0))
1421 return -1;
1422 }
1423 return 0;
1424}
1425
1426int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
1427 int guest_port)
1428{
1429 return add_exec(&exec_list, do_pty, (char *)args,
1430 addr_low_byte, htons(guest_port));
1431}
1432
1433void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
1434{
1435 memcpy(client_ethaddr, ethaddr, ETH_ALEN);
1436}
1437
1438#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
1439HANDLE *slirp_get_events(PNATState pData)
1440{
1441 return pData->phEvents;
1442}
1443void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
1444{
1445 pData->phEvents[index] = hEvent;
1446}
1447#endif
1448
1449unsigned int slirp_get_timeout_ms(PNATState pData)
1450{
1451 if (link_up)
1452 {
1453 if (time_fasttimo)
1454 return 2;
1455 if (do_slowtimo)
1456 return 500; /* see PR_SLOWHZ */
1457 }
1458 return 0;
1459}
1460
1461#ifndef RT_OS_WINDOWS
1462int slirp_get_nsock(PNATState pData)
1463{
1464 return pData->nsock;
1465}
1466#endif
1467
1468/*
1469 * this function called from NAT thread
1470 */
1471void slirp_post_sent(PNATState pData, void *pvArg)
1472{
1473 struct socket *so = 0;
1474 struct tcpcb *tp = 0;
1475 struct mbuf *m = (struct mbuf *)pvArg;
1476 m_free(pData, m);
1477}
1478#ifdef VBOX_WITH_SLIRP_MT
1479void slirp_process_queue(PNATState pData)
1480{
1481 RTReqProcess(pData->pReqQueue, RT_INDEFINITE_WAIT);
1482}
1483void *slirp_get_queue(PNATState pData)
1484{
1485 return pData->pReqQueue;
1486}
1487#endif
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