runqemu-ifupdown/get-tapdevs: Add support for ip tuntap

The *ip* command supports the creation and destruction of TAP devices since
2009 and might be more likely installed on systems then *tunctl*. Therefore
it should be tried to setup or teardown the TAP interface with *ip* before
falling back to *tunctl*.

https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=580fbd88f75cc9eea0d28a48c025b090eb9419a7

(From OE-Core rev: 424ede206baae1c228583aab1df6c18513ac104f)

Signed-off-by: Jörg Sommer <joerg.sommer@navimatix.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 19 insertions, 12 deletions

diff --git a/scripts/runqemu-ifup b/scripts/runqemu-ifup
index bb661740c5..5fdcddeeda 100755
--- a/scripts/runqemu-ifup
+++ b/scripts/runqemu-ifup
@@ -41,22 +41,29 @@ USERID="-u $1"
 GROUP="-g $2"
 STAGING_BINDIR_NATIVE=$3
 
-TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
-if [ ! -x "$TUNCTL" ]; then
-       echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native"
-        exit 1
+if taps=$(ip tuntap list 2>/dev/null); then
+        tap_no=$(( $(echo "$taps" |sort -r |sed 's/^tap//; s/:.*//; q') + 1 ))
+        ip tuntap add tap$tap_no mode tap group $2 && TAP=tap$tap_no
 fi
 
-TAP=`$TUNCTL -b $GROUP 2>&1`
-STATUS=$?
-if [ $STATUS -ne 0 ]; then
-# If tunctl -g fails, try using tunctl -u, for older host kernels 
-# which do not support the TUNSETGROUP ioctl
-        TAP=`$TUNCTL -b $USERID 2>&1`
+if [ -z $TAP ]; then
+        TUNCTL=$STAGING_BINDIR_NATIVE/tunctl
+        if [ ! -x "$TUNCTL" ]; then
+                echo "Error: Unable to find tunctl binary in '$STAGING_BINDIR_NATIVE', please bitbake qemu-helper-native"
+                exit 1
+        fi
+
+        TAP=`$TUNCTL -b $GROUP 2>&1`
         STATUS=$?
         if [ $STATUS -ne 0 ]; then
-                echo "tunctl failed:"
-                exit 1
+        # If tunctl -g fails, try using tunctl -u, for older host kernels
+        # which do not support the TUNSETGROUP ioctl
+                TAP=`$TUNCTL -b $USERID 2>&1`
+                STATUS=$?
+                if [ $STATUS -ne 0 ]; then
+                        echo "tunctl failed:"
+                        exit 1
+                fi
         fi
 fi