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* [Qemu-devel] [PATCH] Use existing tun/tap network interface
@ 2004-11-27 10:54 Lars Munch
  2004-11-28 16:07 ` Thomas Schwinge
  0 siblings, 1 reply; 5+ messages in thread
From: Lars Munch @ 2004-11-27 10:54 UTC (permalink / raw)
  To: qemu-devel

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Hello

The attached patch adds a new option '-tun-if' which will enable you to
use preconfigured tun/tap network interfaces as described here:
http://user-mode-linux.sourceforge.net/UserModeLinux-HOWTO-6.html#ss6.7

To use it, first configure your interface by using for example tunctl
from UML:

# tunctl -t qemu0 -u OWNER
# ifconfig qemu0 xxx.xxx.xxx.xxx up

Now you will have a network interface called 'qemu0'.

Then start qemu with something like this:

# qemu -tun-if qemu0 .....

You can have MAX_NICS numbers of preconfigured network interfaces.

Please apply.

Regards
Lars Munch



[-- Attachment #2: tun-if.patch --]
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Index: Changelog
===================================================================
RCS file: /cvsroot/qemu/qemu/Changelog,v
retrieving revision 1.75
diff -u -p -u -r1.75 Changelog
--- Changelog	24 Nov 2004 19:31:21 -0000	1.75
+++ Changelog	27 Nov 2004 10:32:25 -0000
@@ -3,6 +3,7 @@ version 0.6.2:
   - better BIOS translation and HDD geometry auto-detection
   - user mode networking bug fix
   - undocumented FPU ops support
+  - tun-if option (Lars Munch)
 
 version 0.6.1:
 
Index: qemu-doc.texi
===================================================================
RCS file: /cvsroot/qemu/qemu/qemu-doc.texi,v
retrieving revision 1.50
diff -u -p -u -r1.50 qemu-doc.texi
--- qemu-doc.texi	16 Nov 2004 01:45:27 -0000	1.50
+++ qemu-doc.texi	27 Nov 2004 10:32:25 -0000
@@ -224,6 +224,11 @@ Assumes @var{fd} talks to a tap/tun host
 it. Read @url{http://bellard.org/qemu/tetrinet.html} to have an
 example of its use.
 
+@item -tun-if iface
+Use @var{iface} as TUN/TAP network interface. The interface
+is a preconfigured, persistent network interface and has the same
+owner as the QEMU user.
+
 @item -user-net 
 Use the user mode network stack. This is the default if no tun/tap
 network init script is found.
Index: vl.c
===================================================================
RCS file: /cvsroot/qemu/qemu/vl.c,v
retrieving revision 1.107
diff -u -p -u -r1.107 vl.c
--- vl.c	16 Nov 2004 01:45:27 -0000	1.107
+++ vl.c	27 Nov 2004 10:32:26 -0000
@@ -1596,7 +1596,10 @@ static int tun_open(char *ifname, int if
     }
     memset(&ifr, 0, sizeof(ifr));
     ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
-    pstrcpy(ifr.ifr_name, IFNAMSIZ, "tun%d");
+    if(strlen(ifname) == 0)
+        pstrcpy(ifr.ifr_name, IFNAMSIZ, "tun%d");
+    else
+        pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname);
     ret = ioctl(fd, TUNSETIFF, (void *) &ifr);
     if (ret != 0) {
         fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual network emulation\n");
@@ -1664,6 +1667,19 @@ static int net_fd_init(NetDriverState *n
     return 0;
 }
 
+static int net_if_init(NetDriverState *nd, char *ifname)
+{
+    pstrcpy(nd->ifname, sizeof(nd->ifname), ifname);
+
+    nd->fd = tun_open(nd->ifname, sizeof(nd->ifname));
+    if (nd->fd < 0)
+        return -1;
+
+    nd->send_packet = tun_send_packet;
+    nd->add_read_packet = tun_add_read_packet;
+    return 0;
+}
+
 #endif /* !_WIN32 */
 
 /***********************************************************/
@@ -2514,6 +2530,7 @@ void help(void)
            "-macaddr addr   set the mac address of the first interface\n"
            "-n script       set tap/tun network init script [default=%s]\n"
            "-tun-fd fd      use this fd as already opened tap/tun interface\n"
+           "-tun-if iface   use this iface as already created tap/tun network interface\n"
 #ifdef CONFIG_SLIRP
            "-user-net       use user mode network stack [default if no tap/tun script]\n"
            "-tftp prefix    allow tftp access to files starting with prefix [-user-net]\n"
@@ -2597,6 +2614,7 @@ enum {
     QEMU_OPTION_macaddr,
     QEMU_OPTION_n,
     QEMU_OPTION_tun_fd,
+    QEMU_OPTION_tun_if,
     QEMU_OPTION_user_net,
     QEMU_OPTION_tftp,
     QEMU_OPTION_smb,
@@ -2653,6 +2671,7 @@ const QEMUOption qemu_options[] = {
     { "macaddr", HAS_ARG, QEMU_OPTION_macaddr},
     { "n", HAS_ARG, QEMU_OPTION_n },
     { "tun-fd", HAS_ARG, QEMU_OPTION_tun_fd },
+    { "tun-if", HAS_ARG, QEMU_OPTION_tun_if },
 #ifdef CONFIG_SLIRP
     { "user-net", 0, QEMU_OPTION_user_net },
     { "tftp", HAS_ARG, QEMU_OPTION_tftp },
@@ -2757,7 +2776,8 @@ int main(int argc, char **argv)
     int cyls, heads, secs, translation;
     int start_emulation = 1;
     uint8_t macaddr[6];
-    int net_if_type, nb_tun_fds, tun_fds[MAX_NICS];
+    int net_if_type, nb_tun_fds, nb_tun_ifs, tun_fds[MAX_NICS];
+    char tun_ifs[MAX_NICS][IFNAMSIZ];
     int optind;
     const char *r, *optarg;
     CharDriverState *monitor_hd;
@@ -2798,6 +2818,7 @@ int main(int argc, char **argv)
     serial_device_index = 0;
     
     nb_tun_fds = 0;
+    nb_tun_ifs = 0;
     net_if_type = -1;
     nb_nics = 1;
     /* default mac address of the first network interface */
@@ -2906,7 +2927,7 @@ int main(int argc, char **argv)
                     const char *p;
                     int fd;
                     net_if_type = NET_IF_TUN;
-                    if (nb_tun_fds < MAX_NICS) {
+                    if (nb_tun_fds+nb_tun_ifs < MAX_NICS) {
                         fd = strtol(optarg, (char **)&p, 0);
                         if (*p != '\0') {
                             fprintf(stderr, "qemu: invalid fd for network interface %d\n", nb_tun_fds);
@@ -2916,6 +2937,13 @@ int main(int argc, char **argv)
                     }
                 }
 		break;
+            case QEMU_OPTION_tun_if:
+                net_if_type = NET_IF_TUN;
+                if (nb_tun_fds+nb_tun_ifs < MAX_NICS) {
+                    pstrcpy(tun_ifs[nb_tun_ifs], sizeof(tun_ifs[0]), optarg);
+                    nb_tun_ifs++;
+                }
+                break;
             case QEMU_OPTION_hdc:
                 hd_filename[2] = optarg;
                 has_cdrom = 0;
@@ -3168,6 +3196,9 @@ int main(int argc, char **argv)
         case NET_IF_TUN:
             if (i < nb_tun_fds) {
                 net_fd_init(nd, tun_fds[i]);
+            } else if (i < nb_tun_fds+nb_tun_ifs) {
+                if (net_if_init(nd, tun_ifs[i-nb_tun_fds]) < 0)
+                    net_dummy_init(nd);
             } else {
                 if (net_tun_init(nd) < 0)
                     net_dummy_init(nd);

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2004-11-28 19:47 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-11-27 10:54 [Qemu-devel] [PATCH] Use existing tun/tap network interface Lars Munch
2004-11-28 16:07 ` Thomas Schwinge
2004-11-28 16:37   ` Lars Munch
2004-11-28 18:26     ` Thomas Schwinge
2004-11-28 19:37       ` Lars Munch

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