/**
* @note This function will free m!
*/
int udp_output(PNATState pData, struct socket *so, struct mbuf *m,
struct sockaddr_in *addr)
{
struct sockaddr_in saddr, daddr;
#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
struct socket *pSocketClone = NULL;
#endif
Assert(so->so_type == IPPROTO_UDP);
LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4\n",
so, (long)m, addr->sin_addr.s_addr));
saddr = *addr;
if ((so->so_faddr.s_addr & RT_H2N_U32(pData->netmask)) == pData->special_addr.s_addr)
{
saddr.sin_addr.s_addr = so->so_faddr.s_addr;
if (slirpIsWideCasting(pData, so->so_faddr.s_addr))
{
/**
* We haven't got real firewall but have got its submodule libalias.
*/
m->m_flags |= M_SKIP_FIREWALL;
/**
* udp/137 port is Name Service in NetBIOS protocol. for some reasons Windows guest rejects
* accept data from non-aliased server.
*/
if ( (so->so_fport == so->so_lport)
&& (so->so_fport == RT_H2N_U16(137)))
saddr.sin_addr.s_addr = alias_addr.s_addr;
else
saddr.sin_addr.s_addr = addr->sin_addr.s_addr;
/* we shouldn't override initial socket */
#ifdef VBOX_WITH_NAT_UDP_SOCKET_CLONE
if (so->so_cCloneCounter)
pSocketClone = soLookUpClonedUDPSocket(pData, so, addr->sin_addr.s_addr);
if (!pSocketClone)
pSocketClone = soCloneUDPSocketWithForegnAddr(pData, false, so, addr->sin_addr.s_addr);
Assert((pSocketClone));
so = pSocketClone;
#else
so->so_faddr.s_addr = addr->sin_addr.s_addr;
#endif
}
}
/* Any UDP packet to the loopback address must be translated to be from
* the forwarding address, i.e. 10.0.2.2. */
if ( (saddr.sin_addr.s_addr & RT_H2N_U32_C(IN_CLASSA_NET))
== RT_H2N_U32_C(INADDR_LOOPBACK & IN_CLASSA_NET))
saddr.sin_addr.s_addr = alias_addr.s_addr;
daddr.sin_addr = so->so_laddr;
daddr.sin_port = so->so_lport;
return udp_output2(pData, so, m, &saddr, &daddr, so->so_iptos);
}
DECLINLINE(bool) slirpSend2Home(PNATState pData, struct socket *pSo, const void *pvBuf, uint32_t cbBuf, int iFlags)
{
int idxAddr;
int ret = 0;
bool fSendDone = false;
LogFlowFunc(("Enter pSo:%R[natsock] pvBuf: %p, cbBuf: %d, iFlags: %d\n", pSo, pvBuf, cbBuf, iFlags));
for (idxAddr = 0; idxAddr < pData->cInHomeAddressSize; ++idxAddr)
{
struct socket *pNewSocket = soCloneUDPSocketWithForegnAddr(pData, pSo, pData->pInSockAddrHomeAddress[idxAddr].sin_addr);
AssertReturn((pNewSocket, false));
pData->pInSockAddrHomeAddress[idxAddr].sin_port = pSo->so_fport;
/** @todo more verbose on errors,
* @note: we shouldn't care if this send fail or not (we're in broadcast).
*/
LogFunc(("send %d bytes to %RTnaipv4 from %R[natsock]\n", cbBuf, pData->pInSockAddrHomeAddress[idxAddr].sin_addr.s_addr, pNewSocket));
ret = sendto(pNewSocket->s, pvBuf, cbBuf, iFlags, (struct sockaddr *)&pData->pInSockAddrHomeAddress[idxAddr], sizeof(struct sockaddr_in));
if (ret < 0)
LogFunc(("Failed to send %d bytes to %RTnaipv4\n", cbBuf, pData->pInSockAddrHomeAddress[idxAddr].sin_addr.s_addr));
fSendDone |= ret > 0;
}
LogFlowFunc(("Leave %RTbool\n", fSendDone));
return fSendDone;
}
