slirp.c revision 55c6dd0c4e495858f1681a45e28e04c791ef066e
/* $Id$ */
/** @file
* NAT - slirp glue.
*/
/*
* Copyright (C) 2006-2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*
* This code is based on:
*
* libslirp glue
*
* Copyright (c) 2004-2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "slirp.h"
#ifdef RT_OS_OS2
# include <paths.h>
#endif
#include <VBox/err.h>
#include <VBox/vmm/dbgf.h>
#include <VBox/vmm/pdmdrv.h>
#include <iprt/assert.h>
#include <iprt/file.h>
#ifndef RT_OS_WINDOWS
# include <sys/ioctl.h>
# include <poll.h>
# include <netinet/in.h>
#else
# include <Winnls.h>
# define _WINSOCK2API_
# include <IPHlpApi.h>
#endif
#include <alias.h>
#ifndef RT_OS_WINDOWS
# define DO_ENGAGE_EVENT1(so, fdset, label) \
do { \
if ( so->so_poll_index != -1 \
&& so->s == polls[so->so_poll_index].fd) \
{ \
polls[so->so_poll_index].events |= N_(fdset ## _poll); \
break; \
} \
AssertRelease(poll_index < (nfds)); \
AssertRelease(poll_index >= 0 && poll_index < (nfds)); \
polls[poll_index].fd = (so)->s; \
(so)->so_poll_index = poll_index; \
polls[poll_index].events = N_(fdset ## _poll); \
polls[poll_index].revents = 0; \
poll_index++; \
} while (0)
# define DO_ENGAGE_EVENT2(so, fdset1, fdset2, label) \
do { \
if ( so->so_poll_index != -1 \
&& so->s == polls[so->so_poll_index].fd) \
{ \
polls[so->so_poll_index].events |= \
N_(fdset1 ## _poll) | N_(fdset2 ## _poll); \
break; \
} \
AssertRelease(poll_index < (nfds)); \
polls[poll_index].fd = (so)->s; \
(so)->so_poll_index = poll_index; \
polls[poll_index].events = \
N_(fdset1 ## _poll) | N_(fdset2 ## _poll); \
poll_index++; \
} while (0)
# define DO_POLL_EVENTS(rc, error, so, events, label) do {} while (0)
/*
* DO_CHECK_FD_SET is used in dumping events on socket, including POLLNVAL.
* gcc warns about attempts to log POLLNVAL so construction in a last to lines
* used to catch POLLNVAL while logging and return false in case of error while
* normal usage.
*/
# define DO_CHECK_FD_SET(so, events, fdset) \
( ((so)->so_poll_index != -1) \
&& ((so)->so_poll_index <= ndfs) \
&& ((so)->s == polls[so->so_poll_index].fd) \
&& (polls[(so)->so_poll_index].revents & N_(fdset ## _poll)) \
&& ( N_(fdset ## _poll) == POLLNVAL \
|| !(polls[(so)->so_poll_index].revents & POLLNVAL)))
/* specific for Windows Winsock API */
# define DO_WIN_CHECK_FD_SET(so, events, fdset) 0
# ifndef RT_OS_LINUX
# define readfds_poll (POLLRDNORM)
# define writefds_poll (POLLWRNORM)
# else
# define readfds_poll (POLLIN)
# define writefds_poll (POLLOUT)
# endif
# define xfds_poll (POLLPRI)
# define closefds_poll (POLLHUP)
# define rderr_poll (POLLERR)
# if 0 /* unused yet */
# define rdhup_poll (POLLHUP)
# define nval_poll (POLLNVAL)
# endif
# 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 */
/*
* 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)
/*
* On Windows we use FD_ALL_EVENTS to ensure that we don't miss any event.
*/
# 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(("WSAEventSelect (" #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 %R[natsock] " #label " error %d\n", (so), (error))); \
LogFunc(("WSAEnumNetworkEvents %R[natsock] " #label " error %d\n", (so), (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 closefds_win FD_CLOSE
# define closefds_win_bit FD_CLOSE_BIT
# define connectfds_win FD_CONNECT
# define connectfds_win_bit FD_CONNECT_BIT
# define closefds_win FD_CLOSE
# define closefds_win_bit FD_CLOSE_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)
# define DO_UNIX_CHECK_FD_SET(so, events, fdset) 1 /*specific for Unix API */
#endif /* 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)
#ifdef RT_OS_WINDOWS
# define WIN_TCP_ENGAGE_EVENT2(so, fdset, fdset2) TCP_ENGAGE_EVENT2(so, fdset1, fdset2)
#endif
#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(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 /* !RT_OS_WINDOWS */
# define DO_LOG_NAT_SOCK(so, proto, winevent, r_fdset, w_fdset, x_fdset) \
do { \
LogRel((" " #proto " %R[natsock] %s %s %s er: %s, %s, %s\n", (so), \
CHECK_FD_SET(so, ign ,r_fdset) ? "READ":"", \
CHECK_FD_SET(so, ign, w_fdset) ? "WRITE":"", \
CHECK_FD_SET(so, ign, x_fdset) ? "OOB":"", \
CHECK_FD_SET(so, ign, rderr) ? "RDERR":"", \
CHECK_FD_SET(so, ign, rdhup) ? "RDHUP":"", \
CHECK_FD_SET(so, ign, nval) ? "RDNVAL":"")); \
} while (0)
# endif /* !RT_OS_WINDOWS */
#else /* !VBOX_WITH_DEBUG_NAT_SOCKETS */
# 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 void activate_port_forwarding(PNATState, const uint8_t *pEther);
static const uint8_t special_ethaddr[6] =
{
0x52, 0x54, 0x00, 0x12, 0x35, 0x00
};
static const uint8_t broadcast_ethaddr[6] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
const uint8_t zerro_ethaddr[6] =
{
0x0, 0x0, 0x0, 0x0, 0x0, 0x0
};
/**
* This helper routine do the checks in descriptions to
* ''fUnderPolling'' and ''fShouldBeRemoved'' flags
* @returns 1 if socket removed and 0 if no changes was made.
*/
static int slirpVerifyAndFreeSocket(PNATState pData, struct socket *pSocket)
{
AssertPtrReturn(pData, 0);
AssertPtrReturn(pSocket, 0);
AssertReturn(pSocket->fUnderPolling, 0);
if (pSocket->fShouldBeRemoved)
{
pSocket->fUnderPolling = 0;
sofree(pData, pSocket);
/* pSocket is PHANTOM, now */
return 1;
}
return 0;
}
int slirp_init(PNATState *ppData, uint32_t u32NetAddr, uint32_t u32Netmask,
bool fPassDomain, bool fUseHostResolver, int i32AliasMode,
int iIcmpCacheLimit, void *pvUser)
{
int rc;
PNATState pData;
if (u32Netmask & 0x1f)
/* CTL is x.x.x.15, bootp passes up to 16 IPs (15..31) */
return VERR_INVALID_PARAMETER;
pData = RTMemAllocZ(RT_ALIGN_Z(sizeof(NATState), sizeof(uint64_t)));
*ppData = pData;
if (!pData)
return VERR_NO_MEMORY;
pData->fPassDomain = !fUseHostResolver ? fPassDomain : false;
pData->fUseHostResolver = fUseHostResolver;
pData->fUseHostResolverPermanent = fUseHostResolver;
pData->pvUser = pvUser;
pData->netmask = u32Netmask;
/* sockets & TCP defaults */
pData->socket_rcv = 64 * _1K;
pData->socket_snd = 64 * _1K;
tcp_sndspace = 64 * _1K;
tcp_rcvspace = 64 * _1K;
/*
* Use the same default here as in DevNAT.cpp (SoMaxConnection CFGM value)
* to avoid release log noise.
*/
pData->soMaxConn = 10;
#ifdef RT_OS_WINDOWS
{
WSADATA Data;
WSAStartup(MAKEWORD(2, 0), &Data);
}
pData->phEvents[VBOX_SOCKET_EVENT_INDEX] = CreateEvent(NULL, FALSE, FALSE, NULL);
#endif
link_up = 1;
rc = bootp_dhcp_init(pData);
if (RT_FAILURE(rc))
{
Log(("NAT: DHCP server initialization failed\n"));
RTMemFree(pData);
*ppData = NULL;
return rc;
}
debug_init(pData);
if_init(pData);
ip_init(pData);
icmp_init(pData, iIcmpCacheLimit);
/* Initialise mbufs *after* setting the MTU */
mbuf_init(pData);
pData->special_addr.s_addr = u32NetAddr;
pData->slirp_ethaddr = &special_ethaddr[0];
alias_addr.s_addr = pData->special_addr.s_addr | RT_H2N_U32_C(CTL_ALIAS);
/* @todo: add ability to configure this staff */
/* set default addresses */
inet_aton("127.0.0.1", &loopback_addr);
if (!fUseHostResolver)
{
rc = slirpInitializeDnsSettings(pData);
AssertRCReturn(rc, VINF_NAT_DNS);
}
rc = slirpTftpInit(pData);
AssertRCReturn(rc, VINF_NAT_DNS);
if (i32AliasMode & ~(PKT_ALIAS_LOG|PKT_ALIAS_SAME_PORTS|PKT_ALIAS_PROXY_ONLY))
{
Log(("NAT: alias mode %x is ignored\n", i32AliasMode));
i32AliasMode = 0;
}
pData->i32AliasMode = i32AliasMode;
getouraddr(pData);
{
int flags = 0;
struct in_addr proxy_addr;
pData->proxy_alias = LibAliasInit(pData, NULL);
if (pData->proxy_alias == NULL)
{
Log(("NAT: LibAlias default rule wasn't initialized\n"));
AssertMsgFailed(("NAT: LibAlias default rule wasn't initialized\n"));
}
flags = LibAliasSetMode(pData->proxy_alias, 0, 0);
#ifndef NO_FW_PUNCH
flags |= PKT_ALIAS_PUNCH_FW;
#endif
flags |= pData->i32AliasMode; /* do transparent proxying */
flags = LibAliasSetMode(pData->proxy_alias, flags, ~0);
proxy_addr.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) | CTL_ALIAS);
LibAliasSetAddress(pData->proxy_alias, proxy_addr);
ftp_alias_load(pData);
nbt_alias_load(pData);
if (pData->fUseHostResolver)
dns_alias_load(pData);
}
#ifdef VBOX_WITH_NAT_SEND2HOME
/* @todo: we should know all interfaces available on host. */
pData->pInSockAddrHomeAddress = RTMemAllocZ(sizeof(struct sockaddr));
pData->cInHomeAddressSize = 1;
inet_aton("192.168.1.25", &pData->pInSockAddrHomeAddress[0].sin_addr);
pData->pInSockAddrHomeAddress[0].sin_family = AF_INET;
# ifdef RT_OS_DARWIN
pData->pInSockAddrHomeAddress[0].sin_len = sizeof(struct sockaddr_in);
# endif
#endif
return VINF_SUCCESS;
}
/**
* Register statistics.
*/
void slirp_register_statistics(PNATState pData, PPDMDRVINS pDrvIns)
{
#ifdef VBOX_WITH_STATISTICS
# define PROFILE_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_PROFILE, STAMUNIT_TICKS_PER_CALL, dsc)
# define COUNTING_COUNTER(name, dsc) REGISTER_COUNTER(name, pData, STAMTYPE_COUNTER, STAMUNIT_COUNT, dsc)
# include "counters.h"
# undef COUNTER
/** @todo register statistics for the variables dumped by:
* ipstats(pData); tcpstats(pData); udpstats(pData); icmpstats(pData);
* mbufstats(pData); sockstats(pData); */
#else /* VBOX_WITH_STATISTICS */
NOREF(pData);
NOREF(pDrvIns);
#endif /* !VBOX_WITH_STATISTICS */
}
/**
* Deregister statistics.
*/
void slirp_deregister_statistics(PNATState pData, PPDMDRVINS pDrvIns)
{
if (pData == NULL)
return;
#ifdef VBOX_WITH_STATISTICS
# define PROFILE_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
# define COUNTING_COUNTER(name, dsc) DEREGISTER_COUNTER(name, pData)
# include "counters.h"
#else /* VBOX_WITH_STATISTICS */
NOREF(pData);
NOREF(pDrvIns);
#endif /* !VBOX_WITH_STATISTICS */
}
/**
* Marks the link as up, making it possible to establish new connections.
*/
void slirp_link_up(PNATState pData)
{
struct arp_cache_entry *ac;
link_up = 1;
if (LIST_EMPTY(&pData->arp_cache))
return;
LIST_FOREACH(ac, &pData->arp_cache, list)
{
activate_port_forwarding(pData, ac->ether);
}
}
/**
* Marks the link as down and cleans up the current connections.
*/
void slirp_link_down(PNATState pData)
{
struct socket *so;
struct port_forward_rule *rule;
while ((so = tcb.so_next) != &tcb)
{
/* Don't miss TCB releasing */
if ( !sototcpcb(so)
&& ( so->so_state & SS_NOFDREF
|| so->s == -1))
sofree(pData, so);
else
tcp_close(pData, sototcpcb(so));
}
while ((so = udb.so_next) != &udb)
udp_detach(pData, so);
/*
* Clear the active state of port-forwarding rules to force
* re-setup on restoration of communications.
*/
LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
{
rule->activated = 0;
}
pData->cRedirectionsActive = 0;
link_up = 0;
}
/**
* Terminates the slirp component.
*/
void slirp_term(PNATState pData)
{
if (pData == NULL)
return;
icmp_finit(pData);
slirp_link_down(pData);
slirpReleaseDnsSettings(pData);
ftp_alias_unload(pData);
nbt_alias_unload(pData);
if (pData->fUseHostResolver)
{
dns_alias_unload(pData);
#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
while (!LIST_EMPTY(&pData->DNSMapHead))
{
PDNSMAPPINGENTRY pDnsEntry = LIST_FIRST(&pData->DNSMapHead);
LIST_REMOVE(pDnsEntry, MapList);
RTStrFree(pDnsEntry->pszCName);
RTMemFree(pDnsEntry);
}
#endif
}
while (!LIST_EMPTY(&instancehead))
{
struct libalias *la = LIST_FIRST(&instancehead);
/* libalias do all clean up */
LibAliasUninit(la);
}
while (!LIST_EMPTY(&pData->arp_cache))
{
struct arp_cache_entry *ac = LIST_FIRST(&pData->arp_cache);
LIST_REMOVE(ac, list);
RTMemFree(ac);
}
slirpTftpTerm(pData);
bootp_dhcp_fini(pData);
m_fini(pData);
#ifdef RT_OS_WINDOWS
WSACleanup();
#endif
#ifndef VBOX_WITH_SLIRP_BSD_SBUF
#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
#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)
/*
* curtime kept to an accuracy of 1ms
*/
static void updtime(PNATState pData)
{
#ifdef RT_OS_WINDOWS
struct _timeb tb;
_ftime(&tb);
curtime = (u_int)tb.time * (u_int)1000;
curtime += (u_int)tb.millitm;
#else
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
}
#ifdef RT_OS_WINDOWS
void slirp_select_fill(PNATState pData, int *pnfds)
#else /* RT_OS_WINDOWS */
void slirp_select_fill(PNATState pData, int *pnfds, struct pollfd *polls)
#endif /* !RT_OS_WINDOWS */
{
struct socket *so, *so_next;
int nfds;
#if defined(RT_OS_WINDOWS)
int rc;
int error;
#else
int poll_index = 0;
#endif
int i;
STAM_PROFILE_START(&pData->StatFill, a);
nfds = *pnfds;
/*
* First, TCP sockets
*/
do_slowtimo = 0;
if (!link_up)
goto done;
/*
* *_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;
}
}
}
/* always add the ICMP socket */
#ifndef RT_OS_WINDOWS
pData->icmp_socket.so_poll_index = -1;
#endif
ICMP_ENGAGE_EVENT(&pData->icmp_socket, readfds);
STAM_COUNTER_RESET(&pData->StatTCP);
STAM_COUNTER_RESET(&pData->StatTCPHot);
QSOCKET_FOREACH(so, so_next, tcp)
/* { */
Assert(so->so_type == IPPROTO_TCP);
#if !defined(RT_OS_WINDOWS)
so->so_poll_index = -1;
#endif
STAM_COUNTER_INC(&pData->StatTCP);
#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
/* TCP socket can't be cloned */
Assert((!so->so_cloneOf));
#endif
/*
* See if we need a tcp_fasttimo
*/
if ( time_fasttimo == 0
&& so->so_tcpcb != NULL
&& 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);
#ifdef RT_OS_WINDOWS
WIN_TCP_ENGAGE_EVENT2(so, writefds, connectfds);
#else
TCP_ENGAGE_EVENT1(so, writefds);
#endif
}
/*
* Set for writing if we are connected, can send more, and
* we have something to send
*/
if (CONN_CANFSEND(so) && SBUF_LEN(&so->so_rcv))
{
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 ?
*/
/* @todo: vvl - check which predicat here will be more useful here in rerm of new sbufs. */
if ( CONN_CANFRCV(so)
&& (SBUF_LEN(&so->so_snd) < (SBUF_SIZE(&so->so_snd)/2))
#ifdef RT_OS_WINDOWS
&& !(so->so_state & SS_ISFCONNECTING)
#endif
)
{
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)
/* { */
Assert(so->so_type == IPPROTO_UDP);
STAM_COUNTER_INC(&pData->StatUDP);
#if !defined(RT_OS_WINDOWS)
so->so_poll_index = -1;
#endif
/*
* See if it's timed out
*/
if (so->so_expire)
{
if (so->so_expire <= curtime)
{
Log2(("NAT: %R[natsock] expired\n", so));
if (so->so_timeout != NULL)
{
/* so_timeout - might change the so_expire value or
* drop so_timeout* from so.
*/
so->so_timeout(pData, so, so->so_timeout_arg);
/* on 4.2 so->
*/
if ( so_next->so_prev != so /* so_timeout freed the socket */
|| so->so_timeout) /* so_timeout just freed so_timeout */
CONTINUE_NO_UNLOCK(udp);
}
UDP_DETACH(pData, so, so_next);
CONTINUE_NO_UNLOCK(udp);
}
}
#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
if (so->so_cloneOf)
CONTINUE_NO_UNLOCK(udp);
#endif
/*
* 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);
}
done:
#if defined(RT_OS_WINDOWS)
*pnfds = VBOX_EVENT_COUNT;
#else /* RT_OS_WINDOWS */
AssertRelease(poll_index <= *pnfds);
*pnfds = poll_index;
#endif /* !RT_OS_WINDOWS */
STAM_PROFILE_STOP(&pData->StatFill, a);
}
/**
* This function do Connection or sending tcp sequence to.
* @returns if true operation completed
* @note: functions call tcp_input that potentially could lead to tcp_drop
*/
static bool slirpConnectOrWrite(PNATState pData, struct socket *so, bool fConnectOnly)
{
int ret;
LogFlowFunc(("ENTER: so:%R[natsock], fConnectOnly:%RTbool\n", so, fConnectOnly));
/*
* 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 ( soIgnorableErrorCode(errno)
|| errno == ENOTCONN)
{
LogFlowFunc(("LEAVE: false\n"));
return false;
}
/* 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 if (!fConnectOnly)
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.
*/
LogFlowFunc(("LEAVE: true\n"));
return true;
}
#if defined(RT_OS_WINDOWS)
void slirp_select_poll(PNATState pData, int fTimeout, int fIcmp)
#else /* RT_OS_WINDOWS */
void slirp_select_poll(PNATState pData, struct pollfd *polls, int ndfs)
#endif /* !RT_OS_WINDOWS */
{
struct socket *so, *so_next;
int ret;
#if 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, b);
tcp_fasttimo(pData);
time_fasttimo = 0;
STAM_PROFILE_STOP(&pData->StatFastTimer, b);
}
if (do_slowtimo && ((curtime - last_slowtimo) >= 499))
{
STAM_PROFILE_START(&pData->StatSlowTimer, c);
ip_slowtimo(pData);
tcp_slowtimo(pData);
last_slowtimo = curtime;
STAM_PROFILE_STOP(&pData->StatSlowTimer, c);
}
}
#if defined(RT_OS_WINDOWS)
if (fTimeout)
return; /* only timer update */
#endif
/*
* Check sockets
*/
if (!link_up)
goto done;
#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)
&& CHECK_FD_SET(&pData->icmp_socket, ignored, readfds))
sorecvfrom(pData, &pData->icmp_socket);
#endif
/*
* Check TCP sockets
*/
QSOCKET_FOREACH(so, so_next, tcp)
/* { */
/* TCP socket can't be cloned */
#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
Assert((!so->so_cloneOf));
#endif
Assert(!so->fUnderPolling);
so->fUnderPolling = 1;
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
/*
* FD_ISSET is meaningless on these sockets
* (and they can crash the program)
*/
if (so->so_state & SS_NOFDREF || so->s == -1)
{
so->fUnderPolling = 0;
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)
#ifdef RT_OS_DARWIN
/* Darwin and probably BSD hosts generates POLLPRI|POLLHUP event on receiving TCP.flags.{ACK|URG|FIN} this
* combination on other Unixs hosts doesn't enter to this branch
*/
&& !CHECK_FD_SET(so, NetworkEvents, closefds)
#endif
#ifdef RT_OS_WINDOWS
/**
* In some cases FD_CLOSE comes with FD_OOB, that confuse tcp processing.
*/
&& !WIN_CHECK_FD_SET(so, NetworkEvents, closefds)
#endif
)
{
sorecvoob(pData, so);
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
}
/*
* Check sockets for reading
*/
else if ( CHECK_FD_SET(so, NetworkEvents, readfds)
|| WIN_CHECK_FD_SET(so, NetworkEvents, acceptds))
{
#ifdef RT_OS_WINDOWS
if (WIN_CHECK_FD_SET(so, NetworkEvents, connectfds))
{
/* Finish connection first */
/* should we ignore return value? */
bool fRet = slirpConnectOrWrite(pData, so, true);
LogFunc(("fRet:%RTbool\n", fRet));
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
}
#endif
/*
* Check for incoming connections
*/
if (so->so_state & SS_FACCEPTCONN)
{
TCP_CONNECT(pData, so);
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
if (!CHECK_FD_SET(so, NetworkEvents, closefds))
{
so->fUnderPolling = 0;
CONTINUE(tcp);
}
}
ret = soread(pData, so);
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
/* Output it if we read something */
if (RT_LIKELY(ret > 0))
TCP_OUTPUT(pData, sototcpcb(so));
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
}
/*
* Check for FD_CLOSE events.
* in some cases once FD_CLOSE engaged on socket it could be flashed latter (for some reasons)
*/
if ( CHECK_FD_SET(so, NetworkEvents, closefds)
|| (so->so_close == 1))
{
/*
* drain the socket
*/
for (; so_next->so_prev == so
&& !slirpVerifyAndFreeSocket(pData, so);)
{
ret = soread(pData, so);
if (slirpVerifyAndFreeSocket(pData, so))
break;
if (ret > 0)
TCP_OUTPUT(pData, sototcpcb(so));
else if (so_next->so_prev == so)
{
Log2(("%R[natsock] errno %d (%s)\n", so, errno, strerror(errno)));
break;
}
}
/* if socket freed ''so'' is PHANTOM and next socket isn't points on it */
if (so_next->so_prev == so)
{
/* mark the socket for termination _after_ it was drained */
so->so_close = 1;
/* No idea about Windows but on Posix, POLLHUP means that we can't send more.
* Actually in the specific error scenario, POLLERR is set as well. */
#ifndef RT_OS_WINDOWS
if (CHECK_FD_SET(so, NetworkEvents, rderr))
sofcantsendmore(so);
#endif
}
if (so_next->so_prev == so)
so->fUnderPolling = 0;
CONTINUE(tcp);
}
/*
* Check sockets for writing
*/
if ( CHECK_FD_SET(so, NetworkEvents, writefds)
#ifdef RT_OS_WINDOWS
|| WIN_CHECK_FD_SET(so, NetworkEvents, connectfds)
#endif
)
{
int fConnectOrWriteSuccess = slirpConnectOrWrite(pData, so, false);
/* slirpConnectOrWrite could return true even if tcp_input called tcp_drop,
* so we should be ready to such situations.
*/
if (slirpVerifyAndFreeSocket(pData, so))
CONTINUE(tcp);
else if (!fConnectOrWriteSuccess)
{
so->fUnderPolling = 0;
CONTINUE(tcp);
}
/* slirpConnectionOrWrite succeeded and socket wasn't dropped */
}
/*
* 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 ( soIgnorableErrorCode(errno)
|| 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 ( soIgnorableErrorCode(errno)
|| 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
if (!slirpVerifyAndFreeSocket(pData, so))
so->fUnderPolling = 0;
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)
/* { */
#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
if (so->so_cloneOf)
CONTINUE_NO_UNLOCK(udp);
#endif
#if 0
so->fUnderPolling = 1;
if(slirpVerifyAndFreeSocket(pData, so));
CONTINUE(udp);
so->fUnderPolling = 0;
#endif
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);
}
done:
STAM_PROFILE_STOP(&pData->StatPoll, a);
}
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 */
};
AssertCompileSize(struct arphdr, 28);
static void arp_output(PNATState pData, const uint8_t *pcu8EtherSource, const struct arphdr *pcARPHeaderSource, uint32_t ip4TargetAddress)
{
struct ethhdr *pEtherHeaderResponse;
struct arphdr *pARPHeaderResponse;
uint32_t ip4TargetAddressInHostFormat;
struct mbuf *pMbufResponse;
Assert((pcu8EtherSource));
if (!pcu8EtherSource)
return;
ip4TargetAddressInHostFormat = RT_N2H_U32(ip4TargetAddress);
pMbufResponse = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
if (!pMbufResponse)
return;
pEtherHeaderResponse = mtod(pMbufResponse, struct ethhdr *);
/* @note: if_encap will swap src and dst*/
memcpy(pEtherHeaderResponse->h_source, pcu8EtherSource, ETH_ALEN);
pMbufResponse->m_data += ETH_HLEN;
pARPHeaderResponse = mtod(pMbufResponse, struct arphdr *);
pMbufResponse->m_len = sizeof(struct arphdr);
pARPHeaderResponse->ar_hrd = RT_H2N_U16_C(1);
pARPHeaderResponse->ar_pro = RT_H2N_U16_C(ETH_P_IP);
pARPHeaderResponse->ar_hln = ETH_ALEN;
pARPHeaderResponse->ar_pln = 4;
pARPHeaderResponse->ar_op = RT_H2N_U16_C(ARPOP_REPLY);
memcpy(pARPHeaderResponse->ar_sha, special_ethaddr, ETH_ALEN);
if (!slirpMbufTagService(pData, pMbufResponse, (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)))
{
static bool fTagErrorReported;
if (!fTagErrorReported)
{
LogRel(("NAT: couldn't add the tag(PACKET_SERVICE:%d)\n",
(uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask)));
fTagErrorReported = true;
}
}
pARPHeaderResponse->ar_sha[5] = (uint8_t)(ip4TargetAddressInHostFormat & ~pData->netmask);
memcpy(pARPHeaderResponse->ar_sip, pcARPHeaderSource->ar_tip, 4);
memcpy(pARPHeaderResponse->ar_tha, pcARPHeaderSource->ar_sha, ETH_ALEN);
memcpy(pARPHeaderResponse->ar_tip, pcARPHeaderSource->ar_sip, 4);
if_encap(pData, ETH_P_ARP, pMbufResponse, ETH_ENCAP_URG);
}
/**
* @note This function will free m!
*/
static void arp_input(PNATState pData, struct mbuf *m)
{
struct ethhdr *pEtherHeader;
struct arphdr *pARPHeader;
uint32_t ip4TargetAddress;
int ar_op;
pEtherHeader = mtod(m, struct ethhdr *);
pARPHeader = (struct arphdr *)&pEtherHeader[1];
ar_op = RT_N2H_U16(pARPHeader->ar_op);
ip4TargetAddress = *(uint32_t*)pARPHeader->ar_tip;
switch (ar_op)
{
case ARPOP_REQUEST:
if ( CTL_CHECK(ip4TargetAddress, CTL_DNS)
|| CTL_CHECK(ip4TargetAddress, CTL_ALIAS)
|| CTL_CHECK(ip4TargetAddress, CTL_TFTP))
arp_output(pData, pEtherHeader->h_source, pARPHeader, ip4TargetAddress);
/* Gratuitous ARP */
if ( *(uint32_t *)pARPHeader->ar_sip == *(uint32_t *)pARPHeader->ar_tip
&& memcmp(pARPHeader->ar_tha, broadcast_ethaddr, ETH_ALEN) == 0
&& memcmp(pEtherHeader->h_dest, broadcast_ethaddr, ETH_ALEN) == 0)
{
/* We've received an announce about address assignment,
* let's do an ARP cache update
*/
static bool fGratuitousArpReported;
if (!fGratuitousArpReported)
{
LogRel(("NAT: Gratuitous ARP [IP:%RTnaipv4, ether:%RTmac]\n",
pARPHeader->ar_sip, pARPHeader->ar_sha));
fGratuitousArpReported = true;
}
slirp_arp_cache_update_or_add(pData, *(uint32_t *)pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
}
break;
case ARPOP_REPLY:
slirp_arp_cache_update_or_add(pData, *(uint32_t *)pARPHeader->ar_sip, &pARPHeader->ar_sha[0]);
break;
default:
break;
}
m_freem(pData, m);
}
/**
* Feed a packet into the slirp engine.
*
* @param m Data buffer, m_len is not valid.
* @param cbBuf The length of the data in m.
*/
void slirp_input(PNATState pData, struct mbuf *m, size_t cbBuf)
{
int proto;
static bool fWarnedIpv6;
struct ethhdr *eh;
uint8_t au8Ether[ETH_ALEN];
m->m_len = cbBuf;
if (cbBuf < ETH_HLEN)
{
Log(("NAT: packet having size %d has been ignored\n", m->m_len));
m_freem(pData, m);
return;
}
eh = mtod(m, struct ethhdr *);
proto = RT_N2H_U16(eh->h_proto);
memcpy(au8Ether, eh->h_source, ETH_ALEN);
switch(proto)
{
case ETH_P_ARP:
arp_input(pData, m);
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_adj(m, ETH_HLEN);
M_ASSERTPKTHDR(m);
m->m_pkthdr.header = mtod(m, void *);
ip_input(pData, m);
break;
case ETH_P_IPV6:
m_freem(pData, m);
if (!fWarnedIpv6)
{
LogRel(("NAT: IPv6 not supported\n"));
fWarnedIpv6 = true;
}
break;
default:
Log(("NAT: Unsupported protocol %x\n", proto));
m_freem(pData, m);
break;
}
if (pData->cRedirectionsActive != pData->cRedirectionsStored)
activate_port_forwarding(pData, au8Ether);
}
/**
* Output the IP packet to the ethernet device.
*
* @note This function will free m!
*/
void if_encap(PNATState pData, uint16_t eth_proto, struct mbuf *m, int flags)
{
struct ethhdr *eh;
uint8_t *mbuf = NULL;
size_t mlen = 0;
STAM_PROFILE_START(&pData->StatIF_encap, a);
LogFlowFunc(("ENTER: pData:%p, eth_proto:%RX16, m:%p, flags:%d\n",
pData, eth_proto, m, flags));
M_ASSERTPKTHDR(m);
m->m_data -= ETH_HLEN;
m->m_len += ETH_HLEN;
eh = mtod(m, struct ethhdr *);
mlen = m->m_len;
if (memcmp(eh->h_source, special_ethaddr, ETH_ALEN) != 0)
{
struct m_tag *t = m_tag_first(m);
uint8_t u8ServiceId = CTL_ALIAS;
memcpy(eh->h_dest, eh->h_source, ETH_ALEN);
memcpy(eh->h_source, special_ethaddr, ETH_ALEN);
Assert(memcmp(eh->h_dest, special_ethaddr, ETH_ALEN) != 0);
if (memcmp(eh->h_dest, zerro_ethaddr, ETH_ALEN) == 0)
{
/* don't do anything */
m_freem(pData, m);
goto done;
}
if ( t
&& (t = m_tag_find(m, PACKET_SERVICE, NULL)))
{
Assert(t);
u8ServiceId = *(uint8_t *)&t[1];
}
eh->h_source[5] = u8ServiceId;
}
/*
* we're processing the chain, that isn't not expected.
*/
Assert((!m->m_next));
if (m->m_next)
{
Log(("NAT: if_encap's recived the chain, dropping...\n"));
m_freem(pData, m);
goto done;
}
mbuf = mtod(m, uint8_t *);
eh->h_proto = RT_H2N_U16(eth_proto);
LogFunc(("eh(dst:%RTmac, src:%RTmac)\n", eh->h_dest, eh->h_source));
if (flags & ETH_ENCAP_URG)
slirp_urg_output(pData->pvUser, m, mbuf, mlen);
else
slirp_output(pData->pvUser, m, mbuf, mlen);
done:
STAM_PROFILE_STOP(&pData->StatIF_encap, a);
LogFlowFuncLeave();
}
/**
* Still we're using dhcp server leasing to map ether to IP
* @todo see rt_lookup_in_cache
*/
static uint32_t find_guest_ip(PNATState pData, const uint8_t *eth_addr)
{
uint32_t ip = INADDR_ANY;
int rc;
if (eth_addr == NULL)
return INADDR_ANY;
if ( memcmp(eth_addr, zerro_ethaddr, ETH_ALEN) == 0
|| memcmp(eth_addr, broadcast_ethaddr, ETH_ALEN) == 0)
return INADDR_ANY;
rc = slirp_arp_lookup_ip_by_ether(pData, eth_addr, &ip);
if (RT_SUCCESS(rc))
return ip;
bootp_cache_lookup_ip_by_ether(pData, eth_addr, &ip);
/* ignore return code, ip will be set to INADDR_ANY on error */
return ip;
}
/**
* We need check if we've activated port forwarding
* for specific machine ... that of course relates to
* service mode
* @todo finish this for service case
*/
static void activate_port_forwarding(PNATState pData, const uint8_t *h_source)
{
struct port_forward_rule *rule, *tmp;
const uint8_t *pu8EthSource = h_source;
/* check mac here */
LIST_FOREACH_SAFE(rule, &pData->port_forward_rule_head, list, tmp)
{
struct socket *so;
struct alias_link *alias_link;
struct libalias *lib;
int flags;
struct sockaddr sa;
struct sockaddr_in *psin;
socklen_t socketlen;
struct in_addr alias;
int rc;
uint32_t guest_addr; /* need to understand if we already give address to guest */
if (rule->activated)
continue;
#ifdef VBOX_WITH_NAT_SERVICE
/**
* case when guest ip is INADDR_ANY shouldn't appear in NAT service
*/
Assert((rule->guest_addr.s_addr != INADDR_ANY));
guest_addr = rule->guest_addr.s_addr;
#else /* VBOX_WITH_NAT_SERVICE */
guest_addr = find_guest_ip(pData, pu8EthSource);
#endif /* !VBOX_WITH_NAT_SERVICE */
if (guest_addr == INADDR_ANY)
{
/* the address wasn't granted */
return;
}
#if !defined(VBOX_WITH_NAT_SERVICE)
if ( rule->guest_addr.s_addr != guest_addr
&& rule->guest_addr.s_addr != INADDR_ANY)
continue;
if (rule->guest_addr.s_addr == INADDR_ANY)
rule->guest_addr.s_addr = guest_addr;
#endif
LogRel(("NAT: set redirect %s host port %d => guest port %d @ %RTnaipv4\n",
rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
if (rule->proto == IPPROTO_UDP)
so = udp_listen(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
RT_H2N_U16(rule->guest_port), 0);
else
so = solisten(pData, rule->bind_ip.s_addr, RT_H2N_U16(rule->host_port), guest_addr,
RT_H2N_U16(rule->guest_port), 0);
if (so == NULL)
goto remove_port_forwarding;
psin = (struct sockaddr_in *)&sa;
psin->sin_family = AF_INET;
psin->sin_port = 0;
psin->sin_addr.s_addr = INADDR_ANY;
socketlen = sizeof(struct sockaddr);
rc = getsockname(so->s, &sa, &socketlen);
if (rc < 0 || sa.sa_family != AF_INET)
goto remove_port_forwarding;
psin = (struct sockaddr_in *)&sa;
lib = LibAliasInit(pData, NULL);
flags = LibAliasSetMode(lib, 0, 0);
flags |= pData->i32AliasMode;
flags |= PKT_ALIAS_REVERSE; /* set reverse */
flags = LibAliasSetMode(lib, flags, ~0);
alias.s_addr = RT_H2N_U32(RT_N2H_U32(guest_addr) | CTL_ALIAS);
alias_link = LibAliasRedirectPort(lib, psin->sin_addr, RT_H2N_U16(rule->host_port),
alias, RT_H2N_U16(rule->guest_port),
pData->special_addr, -1, /* not very clear for now */
rule->proto);
if (!alias_link)
goto remove_port_forwarding;
so->so_la = lib;
rule->activated = 1;
rule->so = so;
pData->cRedirectionsActive++;
continue;
remove_port_forwarding:
LogRel(("NAT: failed to redirect %s %d => %d\n",
(rule->proto == IPPROTO_UDP?"UDP":"TCP"), rule->host_port, rule->guest_port));
LIST_REMOVE(rule, list);
pData->cRedirectionsStored--;
RTMemFree(rule);
}
}
/**
* Changes in 3.1 instead of opening new socket do the following:
* gain more information:
* 1. bind IP
* 2. host port
* 3. guest port
* 4. proto
* 5. guest MAC address
* the guest's MAC address is rather important for service, but we easily
* could get it from VM configuration in DrvNAT or Service, the idea is activating
* corresponding port-forwarding
*/
int slirp_add_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
struct in_addr guest_addr, int guest_port, const uint8_t *ethaddr)
{
struct port_forward_rule *rule = NULL;
LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
{
if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
&& rule->host_port == host_port
&& rule->bind_ip.s_addr == host_addr.s_addr
&& rule->guest_port == guest_port
&& rule->guest_addr.s_addr == guest_addr.s_addr
)
return 0; /* rule has been already registered */
}
rule = RTMemAllocZ(sizeof(struct port_forward_rule));
if (rule == NULL)
return 1;
rule->proto = (is_udp ? IPPROTO_UDP : IPPROTO_TCP);
rule->host_port = host_port;
rule->guest_port = guest_port;
rule->guest_addr.s_addr = guest_addr.s_addr;
rule->bind_ip.s_addr = host_addr.s_addr;
if (ethaddr != NULL)
memcpy(rule->mac_address, ethaddr, ETH_ALEN);
/* @todo add mac address */
LIST_INSERT_HEAD(&pData->port_forward_rule_head, rule, list);
pData->cRedirectionsStored++;
/* activate port-forwarding if guest has already got assigned IP */
if ( ethaddr
&& memcmp(ethaddr, zerro_ethaddr, ETH_ALEN))
activate_port_forwarding(pData, ethaddr);
return 0;
}
int slirp_remove_redirect(PNATState pData, int is_udp, struct in_addr host_addr, int host_port,
struct in_addr guest_addr, int guest_port)
{
struct port_forward_rule *rule = NULL;
LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
{
if ( rule->proto == (is_udp ? IPPROTO_UDP : IPPROTO_TCP)
&& rule->host_port == host_port
&& rule->guest_port == guest_port
&& rule->bind_ip.s_addr == host_addr.s_addr
&& rule->guest_addr.s_addr == guest_addr.s_addr
&& rule->activated)
{
LogRel(("NAT: remove redirect %s host port %d => guest port %d @ %RTnaipv4\n",
rule->proto == IPPROTO_UDP ? "UDP" : "TCP", rule->host_port, rule->guest_port, guest_addr));
LibAliasUninit(rule->so->so_la);
if (is_udp)
udp_detach(pData, rule->so);
else
tcp_close(pData, sototcpcb(rule->so));
LIST_REMOVE(rule, list);
RTMemFree(rule);
pData->cRedirectionsStored--;
break;
}
}
return 0;
}
void slirp_set_ethaddr_and_activate_port_forwarding(PNATState pData, const uint8_t *ethaddr, uint32_t GuestIP)
{
#ifndef VBOX_WITH_NAT_SERVICE
memcpy(client_ethaddr, ethaddr, ETH_ALEN);
#endif
if (GuestIP != INADDR_ANY)
{
slirp_arp_cache_update_or_add(pData, GuestIP, ethaddr);
activate_port_forwarding(pData, ethaddr);
}
}
#if 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 3600*1000; /* one hour */
}
#ifndef RT_OS_WINDOWS
int slirp_get_nsock(PNATState pData)
{
return pData->nsock;
}
#endif
/*
* this function called from NAT thread
*/
void slirp_post_sent(PNATState pData, void *pvArg)
{
struct mbuf *m = (struct mbuf *)pvArg;
m_freem(pData, m);
}
void slirp_set_dhcp_TFTP_prefix(PNATState pData, const char *tftpPrefix)
{
Log2(("tftp_prefix: %s\n", tftpPrefix));
tftp_prefix = tftpPrefix;
}
void slirp_set_dhcp_TFTP_bootfile(PNATState pData, const char *bootFile)
{
Log2(("bootFile: %s\n", bootFile));
bootp_filename = bootFile;
}
void slirp_set_dhcp_next_server(PNATState pData, const char *next_server)
{
Log2(("next_server: %s\n", next_server));
if (next_server == NULL)
pData->tftp_server.s_addr = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) | CTL_TFTP);
else
inet_aton(next_server, &pData->tftp_server);
}
int slirp_set_binding_address(PNATState pData, char *addr)
{
if (addr == NULL || (inet_aton(addr, &pData->bindIP) == 0))
{
pData->bindIP.s_addr = INADDR_ANY;
return 1;
}
return 0;
}
void slirp_set_dhcp_dns_proxy(PNATState pData, bool fDNSProxy)
{
if (!pData->fUseHostResolver)
{
Log2(("NAT: DNS proxy switched %s\n", (fDNSProxy ? "on" : "off")));
pData->fUseDnsProxy = fDNSProxy;
}
else if (fDNSProxy)
LogRel(("NAT: Host Resolver conflicts with DNS proxy, the last one was forcely ignored\n"));
}
#define CHECK_ARG(name, val, lim_min, lim_max) \
do { \
if ((val) < (lim_min) || (val) > (lim_max)) \
{ \
LogRel(("NAT: (" #name ":%d) has been ignored, " \
"because out of range (%d, %d)\n", (val), (lim_min), (lim_max))); \
return; \
} \
else \
LogRel(("NAT: (" #name ":%d)\n", (val))); \
} while (0)
void slirp_set_somaxconn(PNATState pData, int iSoMaxConn)
{
LogFlowFunc(("iSoMaxConn:d\n", iSoMaxConn));
/* Conditions */
if (iSoMaxConn > SOMAXCONN)
{
LogRel(("NAT: value of somaxconn(%d) bigger than SOMAXCONN(%d)\n", iSoMaxConn, SOMAXCONN));
iSoMaxConn = SOMAXCONN;
}
if (iSoMaxConn < 1)
{
LogRel(("NAT: proposed value(%d) of somaxconn is invalid, default value is used (%d)\n", iSoMaxConn, pData->soMaxConn));
LogFlowFuncLeave();
return;
}
/* Asignment */
if (pData->soMaxConn != iSoMaxConn)
{
LogRel(("NAT: value of somaxconn has been changed from %d to %d\n",
pData->soMaxConn, iSoMaxConn));
pData->soMaxConn = iSoMaxConn;
}
LogFlowFuncLeave();
}
/* don't allow user set less 8kB and more than 1M values */
#define _8K_1M_CHECK_ARG(name, val) CHECK_ARG(name, (val), 8, 1024)
void slirp_set_rcvbuf(PNATState pData, int kilobytes)
{
_8K_1M_CHECK_ARG("SOCKET_RCVBUF", kilobytes);
pData->socket_rcv = kilobytes;
}
void slirp_set_sndbuf(PNATState pData, int kilobytes)
{
_8K_1M_CHECK_ARG("SOCKET_SNDBUF", kilobytes);
pData->socket_snd = kilobytes * _1K;
}
void slirp_set_tcp_rcvspace(PNATState pData, int kilobytes)
{
_8K_1M_CHECK_ARG("TCP_RCVSPACE", kilobytes);
tcp_rcvspace = kilobytes * _1K;
}
void slirp_set_tcp_sndspace(PNATState pData, int kilobytes)
{
_8K_1M_CHECK_ARG("TCP_SNDSPACE", kilobytes);
tcp_sndspace = kilobytes * _1K;
}
/*
* Looking for Ether by ip in ARP-cache
* Note: it´s responsible of caller to allocate buffer for result
* @returns iprt status code
*/
int slirp_arp_lookup_ether_by_ip(PNATState pData, uint32_t ip, uint8_t *ether)
{
struct arp_cache_entry *ac;
if (ether == NULL)
return VERR_INVALID_PARAMETER;
if (LIST_EMPTY(&pData->arp_cache))
return VERR_NOT_FOUND;
LIST_FOREACH(ac, &pData->arp_cache, list)
{
if ( ac->ip == ip
&& memcmp(ac->ether, broadcast_ethaddr, ETH_ALEN) != 0)
{
memcpy(ether, ac->ether, ETH_ALEN);
return VINF_SUCCESS;
}
}
return VERR_NOT_FOUND;
}
/*
* Looking for IP by Ether in ARP-cache
* Note: it´s responsible of caller to allocate buffer for result
* @returns 0 - if found, 1 - otherwise
*/
int slirp_arp_lookup_ip_by_ether(PNATState pData, const uint8_t *ether, uint32_t *ip)
{
struct arp_cache_entry *ac;
*ip = INADDR_ANY;
if (LIST_EMPTY(&pData->arp_cache))
return VERR_NOT_FOUND;
LIST_FOREACH(ac, &pData->arp_cache, list)
{
if (memcmp(ether, ac->ether, ETH_ALEN) == 0)
{
*ip = ac->ip;
return VINF_SUCCESS;
}
}
return VERR_NOT_FOUND;
}
void slirp_arp_who_has(PNATState pData, uint32_t dst)
{
struct mbuf *m;
struct ethhdr *ehdr;
struct arphdr *ahdr;
static bool fWarned = false;
LogFlowFunc(("ENTER: %RTnaipv4\n", dst));
/* ARP request WHO HAS 0.0.0.0 is one of the signals
* that something has been broken at Slirp. Investigating
* pcap dumps it's easy to miss warning ARP requests being
* focused on investigation of other protocols flow.
*/
#ifdef DEBUG_vvl
Assert((dst != INADDR_ANY));
NOREF(fWarned);
#else
if ( dst == INADDR_ANY
&& !fWarned)
{
LogRel(("NAT:ARP: \"WHO HAS INADDR_ANY\" request has been detected\n"));
fWarned = true;
}
#endif /* !DEBUG_vvl */
m = m_getcl(pData, M_NOWAIT, MT_HEADER, M_PKTHDR);
if (m == NULL)
{
Log(("NAT: Can't alloc mbuf for ARP request\n"));
LogFlowFuncLeave();
return;
}
ehdr = mtod(m, struct ethhdr *);
memset(ehdr->h_source, 0xff, ETH_ALEN);
ahdr = (struct arphdr *)&ehdr[1];
ahdr->ar_hrd = RT_H2N_U16_C(1);
ahdr->ar_pro = RT_H2N_U16_C(ETH_P_IP);
ahdr->ar_hln = ETH_ALEN;
ahdr->ar_pln = 4;
ahdr->ar_op = RT_H2N_U16_C(ARPOP_REQUEST);
memcpy(ahdr->ar_sha, special_ethaddr, ETH_ALEN);
/* we assume that this request come from gw, but not from DNS or TFTP */
ahdr->ar_sha[5] = CTL_ALIAS;
*(uint32_t *)ahdr->ar_sip = RT_H2N_U32(RT_N2H_U32(pData->special_addr.s_addr) | CTL_ALIAS);
memset(ahdr->ar_tha, 0xff, ETH_ALEN); /*broadcast*/
*(uint32_t *)ahdr->ar_tip = dst;
/* warn!!! should falls in mbuf minimal size */
m->m_len = sizeof(struct arphdr) + ETH_HLEN;
m->m_data += ETH_HLEN;
m->m_len -= ETH_HLEN;
if_encap(pData, ETH_P_ARP, m, ETH_ENCAP_URG);
LogFlowFuncLeave();
}
#ifdef VBOX_WITH_DNSMAPPING_IN_HOSTRESOLVER
void slirp_add_host_resolver_mapping(PNATState pData, const char *pszHostName, const char *pszHostNamePattern, uint32_t u32HostIP)
{
LogFlowFunc(("ENTER: pszHostName:%s, pszHostNamePattern:%s u32HostIP:%RTnaipv4\n",
pszHostName ? pszHostName : "(null)",
pszHostNamePattern ? pszHostNamePattern : "(null)",
u32HostIP));
if ( ( pszHostName
|| pszHostNamePattern)
&& u32HostIP != INADDR_ANY
&& u32HostIP != INADDR_BROADCAST)
{
PDNSMAPPINGENTRY pDnsMapping = RTMemAllocZ(sizeof(DNSMAPPINGENTRY));
if (!pDnsMapping)
{
LogFunc(("Can't allocate DNSMAPPINGENTRY\n"));
LogFlowFuncLeave();
return;
}
pDnsMapping->u32IpAddress = u32HostIP;
if (pszHostName)
pDnsMapping->pszCName = RTStrDup(pszHostName);
else if (pszHostNamePattern)
pDnsMapping->pszPattern = RTStrDup(pszHostNamePattern);
if ( !pDnsMapping->pszCName
&& !pDnsMapping->pszPattern)
{
LogFunc(("Can't allocate enough room for %s\n", pszHostName ? pszHostName : pszHostNamePattern));
RTMemFree(pDnsMapping);
LogFlowFuncLeave();
return;
}
LIST_INSERT_HEAD(&pData->DNSMapHead, pDnsMapping, MapList);
LogRel(("NAT: user-defined mapping %s: %RTnaipv4 is registered\n",
pDnsMapping->pszCName ? pDnsMapping->pszCName : pDnsMapping->pszPattern,
pDnsMapping->u32IpAddress));
}
LogFlowFuncLeave();
}
#endif
/* updates the arp cache
* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
* @returns 0 - if has found and updated
* 1 - if hasn't found.
*/
static inline int slirp_arp_cache_update(PNATState pData, uint32_t dst, const uint8_t *mac)
{
struct arp_cache_entry *ac;
Assert(( memcmp(mac, broadcast_ethaddr, ETH_ALEN)
&& memcmp(mac, zerro_ethaddr, ETH_ALEN)));
LIST_FOREACH(ac, &pData->arp_cache, list)
{
if (!memcmp(ac->ether, mac, ETH_ALEN))
{
ac->ip = dst;
return 0;
}
}
return 1;
}
/**
* add entry to the arp cache
* @note: this is helper function, slirp_arp_cache_update_or_add should be used.
*/
static inline void slirp_arp_cache_add(PNATState pData, uint32_t ip, const uint8_t *ether)
{
struct arp_cache_entry *ac = NULL;
Assert(( memcmp(ether, broadcast_ethaddr, ETH_ALEN)
&& memcmp(ether, zerro_ethaddr, ETH_ALEN)));
ac = RTMemAllocZ(sizeof(struct arp_cache_entry));
if (ac == NULL)
{
Log(("NAT: Can't allocate arp cache entry\n"));
return;
}
ac->ip = ip;
memcpy(ac->ether, ether, ETH_ALEN);
LIST_INSERT_HEAD(&pData->arp_cache, ac, list);
}
/* updates or adds entry to the arp cache
* @returns 0 - if has found and updated
* 1 - if hasn't found.
*/
int slirp_arp_cache_update_or_add(PNATState pData, uint32_t dst, const uint8_t *mac)
{
if ( !memcmp(mac, broadcast_ethaddr, ETH_ALEN)
|| !memcmp(mac, zerro_ethaddr, ETH_ALEN))
{
static bool fBroadcastEtherAddReported;
if (!fBroadcastEtherAddReported)
{
LogRel(("NAT: Attempt to add pair [%RTmac:%RTnaipv4] in ARP cache was ignored\n",
mac, dst));
fBroadcastEtherAddReported = true;
}
return 1;
}
if (slirp_arp_cache_update(pData, dst, mac))
slirp_arp_cache_add(pData, dst, mac);
return 0;
}
void slirp_set_mtu(PNATState pData, int mtu)
{
if (mtu < 20 || mtu >= 16000)
{
LogRel(("NAT: mtu(%d) is out of range (20;16000] mtu forcely assigned to 1500\n", mtu));
mtu = 1500;
}
/* MTU is maximum transition unit on */
if_mtu =
if_mru = mtu;
}
/**
* Info handler.
*/
void slirp_info(PNATState pData, const void *pvArg, const char *pszArgs)
{
struct socket *so, *so_next;
struct arp_cache_entry *ac;
struct port_forward_rule *rule;
PCDBGFINFOHLP pHlp = (PCDBGFINFOHLP)pvArg;
NOREF(pszArgs);
pHlp->pfnPrintf(pHlp, "NAT parameters: MTU=%d\n", if_mtu);
pHlp->pfnPrintf(pHlp, "NAT TCP ports:\n");
QSOCKET_FOREACH(so, so_next, tcp)
/* { */
pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
}
pHlp->pfnPrintf(pHlp, "NAT UDP ports:\n");
QSOCKET_FOREACH(so, so_next, udp)
/* { */
pHlp->pfnPrintf(pHlp, " %R[natsock]\n", so);
}
pHlp->pfnPrintf(pHlp, "NAT ARP cache:\n");
LIST_FOREACH(ac, &pData->arp_cache, list)
{
pHlp->pfnPrintf(pHlp, " %RTnaipv4 %RTmac\n", ac->ip, &ac->ether);
}
pHlp->pfnPrintf(pHlp, "NAT rules:\n");
LIST_FOREACH(rule, &pData->port_forward_rule_head, list)
{
pHlp->pfnPrintf(pHlp, " %s %d => %RTnaipv4:%d %c\n",
rule->proto == IPPROTO_UDP ? "UDP" : "TCP",
rule->host_port, rule->guest_addr.s_addr, rule->guest_port,
rule->activated ? ' ' : '*');
}
}