[PATCH] tap-linux: Open ipvtap and macvtap

[Akihiko Odaki <akihiko.odaki@daynix.com>]

ipvtap and macvtap create a file for each interface unlike tuntap, which
creates one file shared by all interfaces. Try to open a file dedicated
to the interface first for ipvtap and macvtap.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
 net/tap-linux.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/net/tap-linux.c b/net/tap-linux.c
index 1226d5fda2d9..22ec2f45d2b7 100644
--- a/net/tap-linux.c
+++ b/net/tap-linux.c
@@ -45,10 +45,21 @@ int tap_open(char *ifname, int ifname_size, int *vnet_hdr,
     int len = sizeof(struct virtio_net_hdr);
     unsigned int features;
 
-    fd = RETRY_ON_EINTR(open(PATH_NET_TUN, O_RDWR));
+
+    ret = if_nametoindex(ifname);
+    if (ret) {
+        g_autofree char *file = g_strdup_printf("/dev/tap%d", ret);
+        fd = open(file, O_RDWR);
+    } else {
+        fd = -1;
+    }
+
     if (fd < 0) {
-        error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN);
-        return -1;
+        fd = RETRY_ON_EINTR(open(PATH_NET_TUN, O_RDWR));
+        if (fd < 0) {
+            error_setg_errno(errp, errno, "could not open %s", PATH_NET_TUN);
+            return -1;
+        }
     }
     memset(&ifr, 0, sizeof(ifr));
     ifr.ifr_flags = IFF_TAP | IFF_NO_PI;

---
base-commit: 31669121a01a14732f57c49400bc239cf9fd505f
change-id: 20241008-macvtap-b152e5abb457

Best regards,
-- 
Akihiko Odaki <akihiko.odaki@daynix.com>