/**
* @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;
Assert(so->so_type == IPPROTO_UDP);
LogFlowFunc(("ENTER: so = %R[natsock], m = %p, saddr = %RTnaipv4\n", so, m, addr->sin_addr.s_addr));
if (so->so_laddr.s_addr == INADDR_ANY)
{
if (pData->guest_addr_guess.s_addr != INADDR_ANY)
{
LogRel2(("NAT: port-forward: using %RTnaipv4 for %R[natsock]\n",
pData->guest_addr_guess.s_addr, so));
so->so_laddr = pData->guest_addr_guess;
}
else
{
LogRel2(("NAT: port-forward: guest address unknown for %R[natsock]\n", so));
m_freem(pData, m);
return 0;
}
}
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;
so->so_faddr.s_addr = addr->sin_addr.s_addr;
}
}
/* 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);
}
/**
* @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);
}