slirp: Rework internal configuration

The user mode IP stack is currently only minimally configurable /wrt to
its virtual IP addresses. This is unfortunate if some guest has a fixed
idea of which IP addresses to use.

Therefore this patch prepares the stack for fully configurable IP
addresses and masks. The user interface and default addresses remain
untouched in this step, they will be enhanced in the following patch.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 6 insertions, 11 deletions

diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index 447a27c..858d1ae 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -384,16 +384,12 @@ int tcp_fconnect(struct socket *so)
     setsockopt(s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(opt ));
 
     addr.sin_family = AF_INET;
-    if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
+    if ((so->so_faddr.s_addr & vnetwork_mask.s_addr) == vnetwork_addr.s_addr) {
       /* It's an alias */
-      switch(ntohl(so->so_faddr.s_addr) & 0xff) {
-      case CTL_DNS:
+      if (so->so_faddr.s_addr == vnameserver_addr.s_addr) {
 	addr.sin_addr = dns_addr;
-	break;
-      case CTL_ALIAS:
-      default:
+      } else {
 	addr.sin_addr = loopback_addr;
-	break;
       }
     } else
       addr.sin_addr = so->so_faddr;
@@ -478,7 +474,7 @@ tcp_connect(struct socket *inso)
 	so->so_faddr = addr.sin_addr;
 	/* Translate connections from localhost to the real hostname */
 	if (so->so_faddr.s_addr == 0 || so->so_faddr.s_addr == loopback_addr.s_addr)
-	   so->so_faddr = alias_addr;
+	   so->so_faddr = vhost_addr;
 
 	/* Close the accept() socket, set right state */
 	if (inso->so_state & SS_FACCEPTONCE) {
@@ -1230,7 +1226,6 @@ do_prompt:
  */
 int tcp_ctl(struct socket *so)
 {
-    int command = (ntohl(so->so_faddr.s_addr) & 0xff);
     struct sbuf *sb = &so->so_snd;
     struct ex_list *ex_ptr;
     int do_pty;
@@ -1238,11 +1233,11 @@ int tcp_ctl(struct socket *so)
     DEBUG_CALL("tcp_ctl");
     DEBUG_ARG("so = %lx", (long )so);
 
-    if (command != CTL_ALIAS) {
+    if (so->so_faddr.s_addr != vhost_addr.s_addr) {
         /* Check if it's pty_exec */
         for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
             if (ex_ptr->ex_fport == so->so_fport &&
-                command == ex_ptr->ex_addr) {
+                so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr) {
                 if (ex_ptr->ex_pty == 3) {
                     so->s = -1;
                     so->extra = (void *)ex_ptr->ex_exec;