slirp.c revision 0f252ad257bdf002284cb2a1359814cd9fa3f2a9
#include "slirp.h"
#ifdef RT_OS_OS2
# include <paths.h>
#endif
#include <VBox/err.h>
#include <VBox/pdmdrv.h>
#include <iprt/assert.h>
#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) || !defined(RT_OS_WINDOWS)
# define DO_ENGAGE_EVENT1(so, fdset, label) \
do { \
FD_SET((so)->s, (fdset)); \
UPD_NFDS((so)->s); \
} while(0)
# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
do { \
FD_SET((so)->s, (fdset1)); \
FD_SET((so)->s, (fdset2)); \
UPD_NFDS((so)->s); \
} while(0)
# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
# define DO_CHECK_FD_SET(so, events, fdset) (FD_ISSET((so)->s, (fdset)))
# define DO_WIN_CHECK_FD_SET(so, events, fdset ) 0 /* specific for Windows Winsock API */
# ifndef RT_OS_WINDOWS
# define ICMP_ENGAGE_EVENT(so, fdset) \
do { \
if (pData->icmp_socket.s != -1) \
DO_ENGAGE_EVENT1((so), (fdset), ICMP); \
} while (0)
# else /* !RT_OS_WINDOWS */
# define ICMP_ENGAGE_EVENT(so, fdset) do {} while(0)
#endif /* RT_OS_WINDOWS */
#else /* defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS) */
/*
* On Windows, we will be notified by IcmpSendEcho2() when the response arrives.
* So no call to WSAEventSelect necessary.
*/
# define ICMP_ENGAGE_EVENT(so, fdset) do {} while(0)
# define DO_ENGAGE_EVENT1(so, fdset1, label) \
do { \
rc = WSAEventSelect((so)->s, VBOX_SOCKET_EVENT, FD_ALL_EVENTS); \
if (rc == SOCKET_ERROR) \
{ \
/* This should not happen */ \
error = WSAGetLastError(); \
LogRel(("WSAEventSelector (" #label ") error %d (so=%x, socket=%s, event=%x)\n", \
error, (so), (so)->s, VBOX_SOCKET_EVENT)); \
} \
} while(0); \
CONTINUE(label)
# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
DO_ENGAGE_EVENT1((so), (fdset1), label)
# define DO_POLL_EVENTS(rc, error, so, events, label) \
(rc) = WSAEnumNetworkEvents((so)->s, VBOX_SOCKET_EVENT, (events)); \
if ((rc) == SOCKET_ERROR) \
{ \
(error) = WSAGetLastError(); \
LogRel(("WSAEnumNetworkEvents " #label " error %d\n", (error))); \
CONTINUE(label); \
}
# define acceptds_win FD_ACCEPT
# define acceptds_win_bit FD_ACCEPT_BIT
# define readfds_win FD_READ
# define readfds_win_bit FD_READ_BIT
# define writefds_win FD_WRITE
# define writefds_win_bit FD_WRITE_BIT
# define xfds_win FD_OOB
# define xfds_win_bit FD_OOB_BIT
# define DO_CHECK_FD_SET(so, events, fdset) \
(((events).lNetworkEvents & fdset ## _win) && ((events).iErrorCode[fdset ## _win_bit] == 0))
# define DO_WIN_CHECK_FD_SET(so, events, fdset ) DO_CHECK_FD_SET((so), (events), fdset)
#endif /* defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS) */
#define TCP_ENGAGE_EVENT1(so, fdset) \
DO_ENGAGE_EVENT1((so), (fdset), tcp)
#define TCP_ENGAGE_EVENT2(so, fdset1, fdset2) \
DO_ENGAGE_EVENT2((so), (fdset1), (fdset2), tcp)
#define UDP_ENGAGE_EVENT(so, fdset) \
DO_ENGAGE_EVENT1((so), (fdset), udp)
#define POLL_TCP_EVENTS(rc, error, so, events) \
DO_POLL_EVENTS((rc), (error), (so), (events), tcp)
#define POLL_UDP_EVENTS(rc, error, so, events) \
DO_POLL_EVENTS((rc), (error), (so), (events), udp)
#define CHECK_FD_SET(so, events, set) \
(DO_CHECK_FD_SET((so), (events), set))
#define WIN_CHECK_FD_SET(so, events, set) \
(DO_WIN_CHECK_FD_SET((so), (events), set))
/*
* Loging macros
*/
#if VBOX_WITH_DEBUG_NAT_SOCKETS
# if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
do { \
LogRel((" " #proto "%R[natsock] %R[natwinnetevents]\n", (so), (winevent))); \
} while (0)
# else
# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
do { \
LogRel((" " #proto " %R[natsock] %s %s %s\n", (so), FD_ISSET((so)->s, (r_fdset))?"READ":"",\
FD_ISSET((so)->s, (w_fdset))?"WRITE":"", FD_ISSET((so)->s, (x_fdset))?"OOB":"")); \
} while (0)
# endif /* VBOX_WITH_DEBUG_NAT_SOCKETS */
#else
# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) do {} while (0)
#endif /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
#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))
static const uint8_t special_ethaddr[6] =
{
0x52, 0x54, 0x00, 0x12, 0x35, 0x00
};
#ifdef RT_OS_WINDOWS
static int get_dns_addr_domain(PNATState pData, bool fVerbose,
struct in_addr *pdns_addr,
const char **ppszDomain)
{
int rc = 0;
FIXED_INFO *FixedInfo = NULL;
ULONG BufLen;
DWORD ret;
IP_ADDR_STRING *pIPAddr;
struct in_addr tmp_addr;
FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
BufLen = sizeof(FIXED_INFO);
/** @todo: this API returns all DNS servers, no matter whether the
* corresponding network adapter is disabled or not. Maybe replace
* this by GetAdapterAddresses(), which is XP/Vista only though. */
if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen))
{
if (FixedInfo)
{
GlobalFree(FixedInfo);
FixedInfo = NULL;
}
FixedInfo = GlobalAlloc(GPTR, BufLen);
}
if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS)
{
Log(("GetNetworkParams failed. ret = %08x\n", (u_int)ret ));
if (FixedInfo)
{
GlobalFree(FixedInfo);
FixedInfo = NULL;
}
rc = -1;
goto get_dns_prefix;
}
#ifndef VBOX_WITH_MULTI_DNS
pIPAddr = &(FixedInfo->DnsServerList);
inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
Log(("nat: DNS Servers:\n"));
if (fVerbose || pdns_addr->s_addr != tmp_addr.s_addr)
LogRel(("NAT: DNS address: %s\n", pIPAddr->IpAddress.String));
*pdns_addr = tmp_addr;
pIPAddr = FixedInfo -> DnsServerList.Next;
while (pIPAddr)
{
if (fVerbose)
LogRel(("NAT: ignored DNS address: %s\n", pIPAddr ->IpAddress.String));
pIPAddr = pIPAddr ->Next;
}
#else
/*localhost mask */
for (pIPAddr = &FixedInfo->DnsServerList; pIPAddr != NULL; pIPAddr = pIPAddr->Next)
{
struct dns_entry *da;
if(!inet_aton(pIPAddr->IpAddress.String, &tmp_addr))
continue;
da = RTMemAllocZ(sizeof (struct dns_entry));
if (da == NULL)
{
LogRel(("can't alloc memory for DNS entry\n"));
return -1;
}
/*check */
if ((da->de_addr.s_addr & htonl(IN_CLASSA_NET)) == ntohl(INADDR_LOOPBACK & IN_CLASSA_NET)) {
da->de_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
}
LIST_INSERT_HEAD(&pData->dns_list_head, da, de_list);
}
#endif
if (FixedInfo)
{
GlobalFree(FixedInfo);
FixedInfo = NULL;
}
get_dns_prefix:
if (ppszDomain)
{
OSVERSIONINFO ver;
char szDnsDomain[256];
DWORD dwSize = sizeof(szDnsDomain);
*ppszDomain = NULL;
GetVersionEx(&ver);
if (ver.dwMajorVersion >= 5)
{
/* GetComputerNameEx exists in Windows versions starting with 2000. */
if (GetComputerNameEx(ComputerNameDnsDomain, szDnsDomain, &dwSize))
{
if (szDnsDomain[0])
{
/* Just non-empty strings are valid. */
*ppszDomain = RTStrDup(szDnsDomain);
if (pData->fPassDomain)
{
if (fVerbose)
LogRel(("NAT: passing domain name %s\n", szDnsDomain));
}
else
Log(("nat: ignoring domain %s\n", szDnsDomain));
}
}
else
Log(("nat: GetComputerNameEx failed (%d)\n", GetLastError()));
}
}
return rc;
}
#else
static int get_dns_addr_domain(PNATState pData, bool fVerbose,
struct in_addr *pdns_addr,
const char **ppszDomain)
{
char buff[512];
char buff2[256];
FILE *f;
int found = 0;
struct in_addr tmp_addr;
#ifdef RT_OS_OS2
/* Try various locations. */
char *etc = getenv("ETC");
f = NULL;
if (etc)
{
snprintf(buff, sizeof(buff), "%s/RESOLV2", etc);
f = fopen(buff, "rt");
}
if (!f)
{
snprintf(buff, sizeof(buff), "%s/RESOLV2", _PATH_ETC);
f = fopen(buff, "rt");
}
if (!f)
{
snprintf(buff, sizeof(buff), "%s/resolv.conf", _PATH_ETC);
f = fopen(buff, "rt");
}
#else
f = fopen("/etc/resolv.conf", "r");
#endif
if (!f)
return -1;
if (ppszDomain)
*ppszDomain = NULL;
Log(("nat: DNS Servers:\n"));
while (fgets(buff, 512, f) != NULL)
{
#ifdef VBOX_WITH_MULTI_DNS
struct dns_entry *da = NULL;
#endif
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1)
{
if (!inet_aton(buff2, &tmp_addr))
continue;
#ifndef VBOX_WITH_MULTI_DNS
/* If it's the first one, set it to dns_addr */
if (!found)
{
if (fVerbose || pdns_addr->s_addr != tmp_addr.s_addr)
LogRel(("NAT: DNS address: %s\n", buff2));
*pdns_addr = tmp_addr;
}
else
{
if (fVerbose)
LogRel(("NAT: ignored DNS address: %s\n", buff2));
}
#else
/*localhost mask */
da = RTMemAllocZ(sizeof (struct dns_entry));
if (da == NULL)
{
LogRel(("can't alloc memory for DNS entry\n"));
return -1;
}
/*check */
da->de_addr.s_addr = tmp_addr.s_addr;
if ((da->de_addr.s_addr & htonl(IN_CLASSA_NET)) == ntohl(INADDR_LOOPBACK & IN_CLASSA_NET)) {
da->de_addr.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_ALIAS);
}
LIST_INSERT_HEAD(&pData->dns_list_head, da, de_list);
#endif
found++;
}
if ( ppszDomain
&& (!strncmp(buff, "domain", 6) || !strncmp(buff, "search", 6)))
{
/* Domain name/search list present. Pick first entry */
if (*ppszDomain == NULL)
{
char *tok;
char *saveptr;
tok = strtok_r(&buff[6], " \t\n", &saveptr);
if (tok)
{
*ppszDomain = RTStrDup(tok);
if (pData->fPassDomain)
{
if (fVerbose)
LogRel(("NAT: passing domain name %s\n", tok));
}
else
Log(("nat: ignoring domain %s\n", tok));
}
}
}
}
fclose(f);
if (!found)
return -1;
return 0;
}
#endif
int get_dns_addr(PNATState pData, struct in_addr *pdns_addr)
{
return get_dns_addr_domain(pData, false, pdns_addr, NULL);
}
int slirp_init(PNATState *ppData, const char *pszNetAddr, uint32_t u32Netmask,
bool fPassDomain, const char *pszTFTPPrefix,
const char *pszBootFile, void *pvUser)
{
int fNATfailed = 0;
int rc;
PNATState pData = RTMemAlloc(sizeof(NATState));
*ppData = pData;
if (!pData)
return VERR_NO_MEMORY;
if (u32Netmask & 0x1f)
/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
return VERR_INVALID_PARAMETER;
memset(pData, '\0', sizeof(NATState));
pData->fPassDomain = fPassDomain;
pData->pvUser = pvUser;
tftp_prefix = pszTFTPPrefix;
bootp_filename = pszBootFile;
pData->netmask = u32Netmask;
#ifdef RT_OS_WINDOWS
{
WSADATA Data;
WSAStartup(MAKEWORD(2,0), &Data);
}
# if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC)
pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
# endif
#endif
#ifdef VBOX_WITH_SLIRP_MT
QSOCKET_LOCK_CREATE(tcb);
QSOCKET_LOCK_CREATE(udb);
rc = RTReqCreateQueue(&pData->pReqQueue);
AssertReleaseRC(rc);
#endif
link_up = 1;
debug_init();
if_init(pData);
ip_init(pData);
icmp_init(pData);
/* Initialise mbufs *after* setting the MTU */
m_init(pData);
inet_aton(pszNetAddr, &special_addr);
alias_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS);
/* @todo: add ability to configure this staff */
pData->tftp_server.s_addr = htonl(ntohl(special_addr.s_addr) | CTL_TFTP);
/* set default addresses */
inet_aton("127.0.0.1", &loopback_addr);
#ifndef VBOX_WITH_MULTI_DNS
inet_aton("127.0.0.1", &dns_addr);
if (get_dns_addr_domain(pData, true, &dns_addr, &pData->pszDomain) < 0)
#else
LIST_INIT(&pData->dns_list_head);
if (get_dns_addr_domain(pData, true, NULL, &pData->pszDomain) < 0)
#endif
fNATfailed = 1;
getouraddr(pData);
return fNATfailed ? VINF_NAT_DNS : VINF_SUCCESS;
}
/**
* Statistics counters.
*/
void slirp_register_timers(PNATState pData, PPDMDRVINS pDrvIns)
{
#ifdef VBOX_WITH_STATISTICS
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFill, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
STAMUNIT_TICKS_PER_CALL, "Profiling slirp fills", "/Drivers/NAT%d/Fill", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatPoll, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
STAMUNIT_TICKS_PER_CALL, "Profiling slirp polls", "/Drivers/NAT%d/Poll", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatFastTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
STAMUNIT_TICKS_PER_CALL, "Profiling slirp fast timer", "/Drivers/NAT%d/TimerFast", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatSlowTimer, STAMTYPE_PROFILE, STAMVISIBILITY_ALWAYS,
STAMUNIT_TICKS_PER_CALL, "Profiling slirp slow timer", "/Drivers/NAT%d/TimerSlow", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
STAMUNIT_COUNT, "TCP sockets", "/Drivers/NAT%d/SockTCP", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatTCPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
STAMUNIT_COUNT, "TCP sockets active", "/Drivers/NAT%d/SockTCPHot", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDP, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
STAMUNIT_COUNT, "UDP sockets", "/Drivers/NAT%d/SockUDP", pDrvIns->iInstance);
PDMDrvHlpSTAMRegisterF(pDrvIns, &pData->StatUDPHot, STAMTYPE_COUNTER, STAMVISIBILITY_ALWAYS,
STAMUNIT_COUNT, "UDP sockets active", "/Drivers/NAT%d/SockUDPHot", pDrvIns->iInstance);
#endif /* VBOX_WITH_STATISTICS */
}
/**
* Marks the link as up, making it possible to establish new connections.
*/
void slirp_link_up(PNATState pData)
{
link_up = 1;
}
/**
* Marks the link as down and cleans up the current connections.
*/
void slirp_link_down(PNATState pData)
{
struct socket *so;
while ((so = tcb.so_next) != &tcb)
{
if (so->so_state & SS_NOFDREF || so->s == -1)
sofree(pData, so);
else
tcp_drop(pData, sototcpcb(so), 0);
}
while ((so = udb.so_next) != &udb)
udp_detach(pData, so);
link_up = 0;
}
/**
* Terminates the slirp component.
*/
void slirp_term(PNATState pData)
{
#ifdef VBOX_WITH_MULTI_DNS
struct dns_entry *de = NULL;
#endif
if (pData->pszDomain)
RTStrFree((char *)(void *)pData->pszDomain);
#ifdef RT_OS_WINDOWS
pData->pfIcmpCloseHandle(pData->icmp_socket.sh);
FreeLibrary(pData->hmIcmpLibrary);
RTMemFree(pData->pvIcmpBuffer);
# else
closesocket(pData->icmp_socket.s);
#endif
slirp_link_down(pData);
#ifdef VBOX_WITH_MULTI_DNS
while(!LIST_EMPTY(&pData->dns_list_head)) {
de = LIST_FIRST(&pData->dns_list_head);
LIST_REMOVE(de, de_list);
RTMemFree(de);
}
#endif
#ifdef RT_OS_WINDOWS
WSACleanup();
#endif
#ifdef LOG_ENABLED
Log(("\n"
"NAT statistics\n"
"--------------\n"
"\n"));
ipstats(pData);
tcpstats(pData);
udpstats(pData);
icmpstats(pData);
mbufstats(pData);
sockstats(pData);
Log(("\n"
"\n"
"\n"));
#endif
RTMemFree(pData);
}
#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
/*
* curtime kept to an accuracy of 1ms
*/
#ifdef RT_OS_WINDOWS
static void updtime(PNATState pData)
{
struct _timeb tb;
_ftime(&tb);
curtime = (u_int)tb.time * (u_int)1000;
curtime += (u_int)tb.millitm;
}
#else
static void updtime(PNATState pData)
{
gettimeofday(&tt, 0);
curtime = (u_int)tt.tv_sec * (u_int)1000;
curtime += (u_int)tt.tv_usec / (u_int)1000;
if ((tt.tv_usec % 1000) >= 500)
curtime++;
}
#endif
void slirp_select_fill(PNATState pData, int *pnfds,
fd_set *readfds, fd_set *writefds, fd_set *xfds)
{
struct socket *so, *so_next;
int nfds;
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
int rc;
int error;
#endif
int i;
STAM_PROFILE_START(&pData->StatFill, a);
nfds = *pnfds;
/*
* First, TCP sockets
*/
do_slowtimo = 0;
if (link_up)
{
/*
* *_slowtimo needs calling if there are IP fragments
* in the fragment queue, or there are TCP connections active
*/
/* XXX:
* triggering of fragment expiration should be the same but use new macroses
*/
do_slowtimo = (tcb.so_next != &tcb);
if (!do_slowtimo)
{
for (i = 0; i < IPREASS_NHASH; i++)
{
if (!TAILQ_EMPTY(&ipq[i]))
{
do_slowtimo = 1;
break;
}
}
}
ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
STAM_COUNTER_RESET(&pData->StatTCP);
STAM_COUNTER_RESET(&pData->StatTCPHot);
QSOCKET_FOREACH(so, so_next, tcp)
/* { */
STAM_COUNTER_INC(&pData->StatTCP);
/*
* See if we need a tcp_fasttimo
*/
if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK)
time_fasttimo = curtime; /* Flag when we want a fasttimo */
/*
* NOFDREF can include still connecting to local-host,
* newly socreated() sockets etc. Don't want to select these.
*/
if (so->so_state & SS_NOFDREF || so->s == -1)
CONTINUE(tcp);
/*
* Set for reading sockets which are accepting
*/
if (so->so_state & SS_FACCEPTCONN)
{
STAM_COUNTER_INC(&pData->StatTCPHot);
TCP_ENGAGE_EVENT1(so, readfds);
CONTINUE(tcp);
}
/*
* Set for writing sockets which are connecting
*/
if (so->so_state & SS_ISFCONNECTING)
{
Log2(("connecting %R[natsock] engaged\n",so));
STAM_COUNTER_INC(&pData->StatTCPHot);
TCP_ENGAGE_EVENT1(so, writefds);
}
/*
* Set for writing if we are connected, can send more, and
* we have something to send
*/
if (CONN_CANFSEND(so) && so->so_rcv.sb_cc)
{
STAM_COUNTER_INC(&pData->StatTCPHot);
TCP_ENGAGE_EVENT1(so, writefds);
}
/*
* Set for reading (and urgent data) if we are connected, can
* receive more, and we have room for it XXX /2 ?
*/
if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2)))
{
STAM_COUNTER_INC(&pData->StatTCPHot);
TCP_ENGAGE_EVENT2(so, readfds, xfds);
}
LOOP_LABEL(tcp, so, so_next);
}
/*
* UDP sockets
*/
STAM_COUNTER_RESET(&pData->StatUDP);
STAM_COUNTER_RESET(&pData->StatUDPHot);
QSOCKET_FOREACH(so, so_next, udp)
/* { */
STAM_COUNTER_INC(&pData->StatUDP);
/*
* See if it's timed out
*/
if (so->so_expire)
{
if (so->so_expire <= curtime)
{
QSOCKET_LOCK(udb);
#ifdef VBOX_WITH_SLIRP_MT
/*we can determinate the next item after udb_detach*/
if (so->so_next != &tcb)
{
SOCKET_LOCK(so->so_next);
so_next = so->so_next;
}
#endif
QSOCKET_UNLOCK(udb);
udp_detach(pData, so);
CONTINUE_NO_UNLOCK(udp);
}
else
do_slowtimo = 1; /* Let socket expire */
}
/*
* When UDP packets are received from over the link, they're
* sendto()'d straight away, so no need for setting for writing
* Limit the number of packets queued by this session to 4.
* Note that even though we try and limit this to 4 packets,
* the session could have more queued if the packets needed
* to be fragmented.
*
* (XXX <= 4 ?)
*/
if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4)
{
STAM_COUNTER_INC(&pData->StatUDPHot);
UDP_ENGAGE_EVENT(so, readfds);
}
LOOP_LABEL(udp, so, so_next);
}
}
#if !defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) || !defined(RT_OS_WINDOWS)
*pnfds = nfds;
#else
*pnfds = VBOX_EVENT_COUNT;
#endif
STAM_PROFILE_STOP(&pData->StatFill, a);
}
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
#else
void slirp_select_poll(PNATState pData, fd_set *readfds, fd_set *writefds, fd_set *xfds)
#endif
{
struct socket *so, *so_next;
int ret;
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
WSANETWORKEVENTS NetworkEvents;
int rc;
int error;
#endif
STAM_PROFILE_START(&pData->StatPoll, a);
/* Update time */
updtime(pData);
/*
* See if anything has timed out
*/
if (link_up)
{
if (time_fasttimo && ((curtime - time_fasttimo) >= 2))
{
STAM_PROFILE_START(&pData->StatFastTimer, a);
tcp_fasttimo(pData);
time_fasttimo = 0;
STAM_PROFILE_STOP(&pData->StatFastTimer, a);
}
if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
{
STAM_PROFILE_START(&pData->StatSlowTimer, a);
ip_slowtimo(pData);
tcp_slowtimo(pData);
last_slowtimo = curtime;
STAM_PROFILE_STOP(&pData->StatSlowTimer, a);
}
}
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
if (fTimeout)
return; /* only timer update */
#endif
/*
* Check sockets
*/
if (link_up)
{
#if defined(RT_OS_WINDOWS)
/*XXX: before renaming please make see define
* fIcmp in slirp_state.h
*/
if (fIcmp)
sorecvfrom(pData, &pData->icmp_socket);
#else
if (pData->icmp_socket.s != -1 && FD_ISSET(pData->icmp_socket.s, readfds))
sorecvfrom(pData, &pData->icmp_socket);
#endif
/*
* Check TCP sockets
*/
QSOCKET_FOREACH(so, so_next, tcp)
/* { */
/*
* FD_ISSET is meaningless on these sockets
* (and they can crash the program)
*/
if (so->so_state & SS_NOFDREF || so->s == -1)
CONTINUE(tcp);
POLL_TCP_EVENTS(rc, error, so, &NetworkEvents);
LOG_NAT_SOCK(so, TCP, &NetworkEvents, readfds, writefds, xfds);
/*
* Check for URG data
* This will soread as well, so no need to
* test for readfds below if this succeeds
*/
/* out-of-band data */
if (CHECK_FD_SET(so, NetworkEvents, xfds))
{
sorecvoob(pData, so);
}
/*
* Check sockets for reading
*/
else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
|| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
{
/*
* Check for incoming connections
*/
if (so->so_state & SS_FACCEPTCONN)
{
TCP_CONNECT(pData, so);
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
if (!(NetworkEvents.lNetworkEvents & FD_CLOSE))
#endif
CONTINUE(tcp);
}
SOREAD(ret, pData, so, /*fCloseIfNothingRead=*/false);
/* Output it if we read something */
if (ret > 0)
TCP_OUTPUT(pData, sototcpcb(so));
}
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
/*
* Check for FD_CLOSE events.
*/
if (NetworkEvents.lNetworkEvents & FD_CLOSE)
{
/*
* drain the socket
*/
for (;;)
{
SOREAD(ret, pData, so, /*fCloseIfNothingRead=*/true);
if (ret > 0)
TCP_OUTPUT(pData, sototcpcb(so));
else
break;
}
}
#endif
/*
* Check sockets for writing
*/
if (CHECK_FD_SET(so, NetworkEvents, writefds))
{
/*
* Check for non-blocking, still-connecting sockets
*/
if (so->so_state & SS_ISFCONNECTING)
{
Log2(("connecting %R[natsock] catched\n", so));
/* Connected */
so->so_state &= ~SS_ISFCONNECTING;
/*
* This should be probably guarded by PROBE_CONN too. Anyway,
* we disable it on OS/2 because the below send call returns
* EFAULT which causes the opened TCP socket to close right
* after it has been opened and connected.
*/
#ifndef RT_OS_OS2
ret = send(so->s, (const char *)&ret, 0, 0);
if (ret < 0)
{
/* XXXXX Must fix, zero bytes is a NOP */
if ( errno == EAGAIN
|| errno == EWOULDBLOCK
|| errno == EINPROGRESS
|| errno == ENOTCONN)
CONTINUE(tcp);
/* else failed */
so->so_state = SS_NOFDREF;
}
/* else so->so_state &= ~SS_ISFCONNECTING; */
#endif
/*
* Continue tcp_input
*/
TCP_INPUT(pData, (struct mbuf *)NULL, sizeof(struct ip), so);
/* continue; */
}
else
SOWRITE(ret, pData, so);
/*
* XXX If we wrote something (a lot), there could be the need
* for a window update. In the worst case, the remote will send
* a window probe to get things going again.
*/
}
/*
* Probe a still-connecting, non-blocking socket
* to check if it's still alive
*/
#ifdef PROBE_CONN
if (so->so_state & SS_ISFCONNECTING)
{
ret = recv(so->s, (char *)&ret, 0, 0);
if (ret < 0)
{
/* XXX */
if ( errno == EAGAIN
|| errno == EWOULDBLOCK
|| errno == EINPROGRESS
|| errno == ENOTCONN)
{
CONTINUE(tcp); /* Still connecting, continue */
}
/* else failed */
so->so_state = SS_NOFDREF;
/* tcp_input will take care of it */
}
else
{
ret = send(so->s, &ret, 0, 0);
if (ret < 0)
{
/* XXX */
if ( errno == EAGAIN
|| errno == EWOULDBLOCK
|| errno == EINPROGRESS
|| errno == ENOTCONN)
{
CONTINUE(tcp);
}
/* else failed */
so->so_state = SS_NOFDREF;
}
else
so->so_state &= ~SS_ISFCONNECTING;
}
TCP_INPUT((struct mbuf *)NULL, sizeof(struct ip),so);
} /* SS_ISFCONNECTING */
#endif
LOOP_LABEL(tcp, so, so_next);
}
/*
* Now UDP sockets.
* Incoming packets are sent straight away, they're not buffered.
* Incoming UDP data isn't buffered either.
*/
QSOCKET_FOREACH(so, so_next, udp)
/* { */
POLL_UDP_EVENTS(rc, error, so, &NetworkEvents);
LOG_NAT_SOCK(so, UDP, &NetworkEvents, readfds, writefds, xfds);
if (so->s != -1 && CHECK_FD_SET(so, NetworkEvents, readfds))
{
SORECVFROM(pData, so);
}
LOOP_LABEL(udp, so, so_next);
}
}
#ifndef VBOX_WITH_SLIRP_MT
/*
* See if we can start outputting
*/
if (if_queued && link_up)
if_start(pData);
#endif
STAM_PROFILE_STOP(&pData->StatPoll, a);
}
#define ETH_ALEN 6
#define ETH_HLEN 14
#define ARPOP_REQUEST 1 /* ARP request */
#define ARPOP_REPLY 2 /* ARP reply */
struct ethhdr
{
unsigned char h_dest[ETH_ALEN]; /* destination eth addr */
unsigned char h_source[ETH_ALEN]; /* source ether addr */
unsigned short h_proto; /* packet type ID field */
};
struct arphdr
{
unsigned short ar_hrd; /* format of hardware address */
unsigned short ar_pro; /* format of protocol address */
unsigned char ar_hln; /* length of hardware address */
unsigned char ar_pln; /* length of protocol address */
unsigned short ar_op; /* ARP opcode (command) */
/*
* Ethernet looks like this : This bit is variable sized however...
*/
unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */
unsigned char ar_sip[4]; /* sender IP address */
unsigned char ar_tha[ETH_ALEN]; /* target hardware address */
unsigned char ar_tip[4]; /* target IP address */
};
static
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
void arp_input(PNATState pData, struct mbuf *m)
#else
void arp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
#endif
{
struct ethhdr *eh;
struct ethhdr *reh;
struct arphdr *ah;
struct arphdr *rah;
int ar_op;
struct ex_list *ex_ptr;
uint32_t htip;
#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
uint8_t arp_reply[sizeof(struct arphdr) + ETH_HLEN];
eh = (struct ethhdr *)pkt;
#else
struct mbuf *mr;
eh = mtod(m, struct ethhdr *);
#endif
ah = (struct arphdr *)&eh[1];
htip = ntohl(*(uint32_t*)ah->ar_tip);
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
mr = m_get(pData);
mr->m_data += if_maxlinkhdr;
mr->m_len = sizeof(struct arphdr);
rah = mtod(mr, struct arphdr *);
#else
reh = (struct ethhdr *)arp_reply;
rah = (struct arphdr *)&reh[1];
#endif
ar_op = ntohs(ah->ar_op);
switch(ar_op)
{
case ARPOP_REQUEST:
if ((htip & pData->netmask) == ntohl(special_addr.s_addr))
{
if ( CTL_CHECK(htip,CTL_DNS)
|| CTL_CHECK(htip, CTL_ALIAS)
|| CTL_CHECK(htip, CTL_TFTP))
goto arp_ok;
for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
{
if ((htip & ~pData->netmask) == ex_ptr->ex_addr)
goto arp_ok;
}
return;
arp_ok:
#ifndef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
memcpy(reh->h_dest, eh->h_source, ETH_ALEN);
memcpy(reh->h_source, &special_addr, ETH_ALEN);
reh->h_source[5] = ah->ar_tip[3];
reh->h_proto = htons(ETH_P_ARP);
#endif
rah->ar_hrd = htons(1);
rah->ar_pro = htons(ETH_P_IP);
rah->ar_hln = ETH_ALEN;
rah->ar_pln = 4;
rah->ar_op = htons(ARPOP_REPLY);
memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN);
switch (htip & ~pData->netmask)
{
case CTL_DNS:
case CTL_ALIAS:
rah->ar_sha[5] = (uint8_t)(htip & ~pData->netmask);
break;
default:;
}
memcpy(rah->ar_sip, ah->ar_tip, 4);
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
memcpy(rah->ar_tip, ah->ar_sip, 4);
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
if_encap(pData, ETH_P_ARP, mr);
m_free(pData, m);
#else
slirp_output(pData->pvUser, arp_reply, sizeof(arp_reply));
#endif
}
break;
default:
break;
}
}
void slirp_input(PNATState pData, const uint8_t *pkt, int pkt_len)
{
struct mbuf *m;
int proto;
static bool fWarnedIpv6;
if (pkt_len < ETH_HLEN)
{
LogRel(("NAT: packet having size %d has been ingnored\n", pkt_len));
return;
}
m = m_get(pData);
if (!m)
{
LogRel(("can't allocate new mbuf\n"));
return;
}
/* Note: we add to align the IP header */
if (M_FREEROOM(m) < pkt_len)
m_inc(m, pkt_len);
m->m_len = pkt_len ;
memcpy(m->m_data, pkt, pkt_len);
proto = ntohs(*(uint16_t *)(pkt + 12));
switch(proto)
{
case ETH_P_ARP:
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
arp_input(pData, m);
#else
arp_input(pData, pkt, pkt_len);
m_free(pData, m);
#endif
break;
case ETH_P_IP:
/* Update time. Important if the network is very quiet, as otherwise
* the first outgoing connection gets an incorrect timestamp. */
updtime(pData);
m->m_data += ETH_HLEN;
m->m_len -= ETH_HLEN;
ip_input(pData, m);
break;
case ETH_P_IPV6:
m_free(pData, m);
if (!fWarnedIpv6)
{
LogRel(("NAT: IPv6 not supported\n"));
fWarnedIpv6 = true;
}
break;
default:
LogRel(("NAT: Unsupported protocol %x\n", proto));
m_free(pData, m);
break;
}
}
/* output the IP packet to the ethernet device */
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m)
#else
void if_encap(PNATState pData, uint8_t *ip_data, int ip_data_len)
#endif
{
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
struct ethhdr *eh;
uint8_t *buf = RTMemAlloc(1600);
m->m_data -= if_maxlinkhdr;
m->m_len += ETH_HLEN;
eh = mtod(m, struct ethhdr *);
#else
uint8_t buf[1600];
struct ethhdr *eh = (struct ethhdr *)buf;
if (ip_data_len + ETH_HLEN > sizeof(buf))
return;
memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len);
#endif
memcpy(eh->h_dest, client_ethaddr, ETH_ALEN);
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
/* XXX: not correct */
eh->h_source[5] = CTL_ALIAS;
#ifdef VBOX_WITH_SIMPLIFIED_SLIRP_SYNC
eh->h_proto = htons(eth_proto);
#if 0
slirp_output(pData->pvUser, m, mtod(m, uint8_t *), m->m_len);
#else
memcpy(buf, mtod(m, uint8_t *), m->m_len);
slirp_output(pData->pvUser, NULL, buf, m->m_len);
m_free(pData, m);
#endif
#else
eh->h_proto = htons(ETH_P_IP);
slirp_output(pData->pvUser, buf, ip_data_len + ETH_HLEN);
#endif
}
int slirp_redir(PNATState pData, int is_udp, int host_port,
struct in_addr guest_addr, int guest_port)
{
if (is_udp)
{
if (!udp_listen(pData, htons(host_port), guest_addr.s_addr,
htons(guest_port), 0))
return -1;
}
else
{
if (!solisten(pData, htons(host_port), guest_addr.s_addr,
htons(guest_port), 0))
return -1;
}
return 0;
}
int slirp_add_exec(PNATState pData, int do_pty, const char *args, int addr_low_byte,
int guest_port)
{
return add_exec(&exec_list, do_pty, (char *)args,
addr_low_byte, htons(guest_port));
}
void slirp_set_ethaddr(PNATState pData, const uint8_t *ethaddr)
{
memcpy(client_ethaddr, ethaddr, ETH_ALEN);
}
#if defined(VBOX_WITH_SIMPLIFIED_SLIRP_SYNC) && defined(RT_OS_WINDOWS)
HANDLE *slirp_get_events(PNATState pData)
{
return pData->phEvents;
}
void slirp_register_external_event(PNATState pData, HANDLE hEvent, int index)
{
pData->phEvents[index] = hEvent;
}
#endif
unsigned int slirp_get_timeout_ms(PNATState pData)
{
if (link_up)
{
if (time_fasttimo)
return 2;
if (do_slowtimo)
return 500; /* see PR_SLOWHZ */
}
return 0;
}
/*
* this function called from NAT thread
*/
void slirp_post_sent(PNATState pData, void *pvArg)
{
struct socket *so = 0;
struct tcpcb *tp = 0;
struct mbuf *m = (struct mbuf *)pvArg;
m_free(pData, m);
}
#ifdef VBOX_WITH_SLIRP_MT
void slirp_process_queue(PNATState pData)
{
RTReqProcess(pData->pReqQueue, RT_INDEFINITE_WAIT);
}
void *slirp_get_queue(PNATState pData)
{
return pData->pReqQueue;
}
#endif