slirp: Adding family argument to tcp_fconnect()

This patch simply adds a unsigned short family argument to remove the hardcoded
"AF_INET" in the call of qemu_socket().

This prepares for IPv6 support.
Signed-off-by: NGuillaume Subiron <maethor@subiron.org>
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: NThomas Huth <thuth@redhat.com>
Signed-off-by: NJason Wang <jasowang@redhat.com>

slirp/slirp.h

@@ -327,7 +327,7 @@ void tcp_respond(struct tcpcb *, register struct tcpiphdr *, register struct mbu
 struct tcpcb * tcp_newtcpcb(struct socket *);
 struct tcpcb * tcp_close(register struct tcpcb *);
 void tcp_sockclosed(struct tcpcb *);
-int tcp_fconnect(struct socket *);
+int tcp_fconnect(struct socket *, unsigned short af);
 void tcp_connect(struct socket *);
 int tcp_attach(struct socket *);
 uint8_t tcp_tos(struct socket *);

slirp/tcp_input.c

@@ -584,7 +584,7 @@ findso:
 	    goto cont_input;
 	  }
 
-          if ((tcp_fconnect(so) == -1) &&
+	  if ((tcp_fconnect(so, so->so_ffamily) == -1) &&
 #if defined(_WIN32)
               socket_error() != WSAEWOULDBLOCK
 #else

slirp/tcp_subr.c

@@ -324,14 +324,15 @@ tcp_sockclosed(struct tcpcb *tp)
  * nonblocking.  Connect returns after the SYN is sent, and does
  * not wait for ACK+SYN.
  */
-int tcp_fconnect(struct socket *so)
+int tcp_fconnect(struct socket *so, unsigned short af)
 {
   int ret=0;
 
   DEBUG_CALL("tcp_fconnect");
   DEBUG_ARG("so = %p", so);
 
-  if( (ret = so->s = qemu_socket(AF_INET,SOCK_STREAM,0)) >= 0) {
+  ret = so->s = qemu_socket(af, SOCK_STREAM, 0);
+  if (ret >= 0) {
     int opt, s=so->s;
     struct sockaddr_storage addr;