net: import linux tap ioctl definitions

Making features dependent on the availability of newer versions if_tun.h
is going to get seriously clumsy, so let's just import the definitions
we need. It's only a small handful.

If and when we're comfortable depending on 2.6.30 headers, we can remove
this again.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

3 files changed, 31 insertions, 17 deletions

diff --git a/net.c b/net.c
index 75a01d2a1c..acddb971c8 100644
--- a/net.c
+++ b/net.c
@@ -46,7 +46,7 @@
 #include <net/if_tap.h>
 #endif
 #ifdef __linux__
-#include <linux/if_tun.h>
+#include "tap-linux.h"
 #endif
 #include <arpa/inet.h>
 #include <dirent.h>
@@ -1385,7 +1385,6 @@ static void tap_send(void *opaque)
     } while (size > 0);
 }
 
-#ifdef TUNSETSNDBUF
 /* sndbuf should be set to a value lower than the tx queue
  * capacity of any destination network interface.
  * Ethernet NICs generally have txqueuelen=1000, so 1Mb is
@@ -1408,12 +1407,6 @@ static int tap_set_sndbuf(TAPState *s, QemuOpts *opts)
     }
     return 0;
 }
-#else
-static int tap_set_sndbuf(TAPState *s, QemuOpts *opts)
-{
-    return 0;
-}
-#endif /* TUNSETSNDBUF */
 
 static void tap_cleanup(VLANClientState *vc)
 {
@@ -2987,12 +2980,10 @@ static struct {
                 .name = "downscript",
                 .type = QEMU_OPT_STRING,
                 .help = "script to shut down the interface",
-#ifdef TUNSETSNDBUF
             }, {
                 .name = "sndbuf",
                 .type = QEMU_OPT_SIZE,
                 .help = "send buffer limit"
-#endif
             },
             { /* end of list */ }
         },
diff --git a/qemu-options.hx b/qemu-options.hx
index 20aa242054..c745e0ca26 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -810,21 +810,15 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
     "-net tap[,vlan=n][,name=str],ifname=name\n"
     "                connect the host TAP network interface to VLAN 'n'\n"
 #else
-    "-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile]"
-#ifdef TUNSETSNDBUF
-    "[,sndbuf=nbytes]"
-#endif
-    "\n"
+    "-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile][,sndbuf=nbytes]\n"
     "                connect the host TAP network interface to VLAN 'n' and use the\n"
     "                network scripts 'file' (default=%s)\n"
     "                and 'dfile' (default=%s);\n"
     "                use '[down]script=no' to disable script execution;\n"
     "                use 'fd=h' to connect to an already opened TAP interface\n"
-#ifdef TUNSETSNDBUF
     "                use 'sndbuf=nbytes' to limit the size of the send buffer; the\n"
     "                default of 'sndbuf=1048576' can be disabled using 'sndbuf=0'\n"
 #endif
-#endif
     "-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n"
     "                connect the vlan 'n' to another VLAN using a socket connection\n"
     "-net socket[,vlan=n][,name=str][,fd=h][,mcast=maddr:port]\n"
diff --git a/tap-linux.h b/tap-linux.h
new file mode 100644
index 0000000000..cd07ea8efb
--- /dev/null
+++ b/tap-linux.h
@@ -0,0 +1,29 @@
+/*
+ *  Universal TUN/TAP device driver.
+ *  Copyright (C) 1999-2000 Maxim Krasnyansky <max_mk@yahoo.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *  GNU General Public License for more details.
+ */
+
+#ifndef QEMU_TAP_H
+#define QEMU_TAP_H
+
+#include <linux/ioctl.h>
+
+/* Ioctl defines */
+#define TUNSETIFF     _IOW('T', 202, int)
+#define TUNSETSNDBUF   _IOW('T', 212, int)
+
+/* TUNSETIFF ifr flags */
+#define IFF_TAP		0x0002
+#define IFF_NO_PI	0x1000
+
+#endif /* QEMU_TAP_H */